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Table of Content
20 June 2023, Volume 32 Issue 6
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  • Spatio-temporal Evolution and Influencing Factors of Carbon Emission Efficiency of Manufacturing Industry in Yangtze River Economic Belt
    HUANG De-chun , , SHEN Xue-mei , , ZHU Yun,
    2023, (6):  1113-1126.  doi:10.11870/cjlyzyyhj202306001
    Abstract ( 354 )   PDF (1794KB) ( 76 )   Save
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    With the proposal of carbon peaking and carbon neutrality goals, to promote the high-quality development of the Yangtze River Economic Belt, it is necessary to improve the carbon emission efficiency of the manufacturing industry and promote the green low-carbon transformation of the industry. Based on the relevant data of manufacturing industry and high carbon manufacturing industry in various provinces and cities of the Yangtze River Economic Belt from 2006 to 2019, the carbon emission efficiency of manufacturing industry in the Yangtze River Economic Belt is calculated through the super efficiency SBM model, and its temporal and spatial change characteristics are analyzed. The influencing factors are studied through the panel fixation effect model . The following conclusions are drawn: (1) the carbon emission efficiency of manufacturing industry is continuously improved from 2006 to 2019; The carbon emission efficiency shows a spatial distribution pattern of “lower, middle and upper reaches” decreasing, and the spatial difference is narrowing as a whole. (2) The carbon emission efficiency of high carbon manufacturing industry is significantly different, and the spatial distribution of carbon emission efficiency of different high carbon manufacturing industries is different. (3) Industry growth capacity, industry energy utilization efficiency, industry scale, per capita GDP level and urbanization rate have a positive impact on the carbon emission efficiency of manufacturing industry in the Yangtze River Economic Belt, while industry FDI and industrialization level have a negative impact on it; The effect of factors on the upstream, middle and downstream areas is different. Therefore, it is necessary to promote the coordinated green development of the upper, middle and lower reaches of the Yangtze River Economic Belt, actively promote urbanization, improve the efficiency and structure of foreign direct investment in manufacturing, accelerate the transformation and upgrading of traditional manufacturing, guide the improvement of energy utilization efficiency of manufacturing, and promote high-quality green development of manufacturing.
    Identification and Solution of Decoupling Trap between Carbon Emissions and Economic Growth in Yangtze River Economic Belt 
    ZHAO Fei-fei, HU Zheng, ZHAO Xu, HE Wei-jun
    2023, (6):  1127-1137.  doi:10.11870/cjlyzyyhj202306002
    Abstract ( 214 )   PDF (2271KB) ( 76 )   Save
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    In order to promote the continuous and stable decoupling of urban carbon emissions and economic growth in the Yangtze River Economic Belt and take the lead in completing the strategic mission of “double carbon” goal, this paper puts forward the concepts and identification methods of “decoupling trap” and “decoupling authenticity”, and then combines the Tapio decoupling model with the Logit model to analyze and test the “decoupling authenticity” status of carbon emissions and economic growth in 110 prefecture-level and above cities in the Yangtze River Economic Belt from 2006 to 2019, and explores the main driving forces to break the “decoupling trap”. The results show that: (1) The 110 cities in the Yangtze River Economic Belt mainly show strong and weak decoupling. The expansion connection and growth negative decoupling show sporadic distribution, and the overall decoupling state is good. However, the decoupling state has spatial heterogeneity and time series fluctuation characteristics. Huangshi, Xiangtan and other cities have a re-coupling phenomenon, falling into a “decoupling trap” and showing a “pseudo-decoupling” state. (2) “True and false decoupling” cities have significant regional characteristics, “true decoupling” cities are mainly located in the downstream areas, and most of them are provincial capitals, cities falling into the “decoupling trap” are mainly distributed in the upper and middle reaches. (3) Improving technological innovation capability, optimizing agglomeration scale and increasing foreign direct investment are important measures for cities to achieve endogenous decoupling and avoid falling into the “decoupling trap”.
    Does Development Strategy of Yangtze River Economic Belt Promote Regional Carbon Emission Reduction?:Tests based on Difference-in-Differences Model
    YAN Hua-fei, YANG Mei, XIAO Jing
    2023, (6):  1138-1151.  doi:10.11870/cjlyzyyhj202306003
    Abstract ( 144 )   PDF (983KB) ( 90 )   Save
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     Carbon emission reduction is a necessary way to achieve the goal of “carbon neutralization and carbon peak”. Whether the development strategy of the Yangtze River Economic Belt can effectively promote regional carbon emission reduction is an urgent problem to be explored. Based on the panel data of 30 provinces in China from 2010 to 2019, the study uses a double difference model to explore the impact of the development strategy of the Yangtze River Economic Belt on regional carbon emission reduction and its transmission mechanism. The research shows that: (1) the development strategy of the Yangtze River Economic Belt can significantly promote regional carbon emission reduction. (2) Heterogeneity analysis found that the carbon emission reduction effect of the development strategy of the Yangtze River Economic Belt is significant in the middle and lower reaches of the Yangtze River Economic Belt, but not in the upper reaches. (3) The mechanism analysis shows that green technology innovation plays an intermediary role between the development strategy of the Yangtze River Economic Belt and regional carbon emission reduction, and the intermediary effect value is 53.2%.
    Impact on Spatial Effect of Green Technology Innovation on Industrial Carbon Dioxide Emissions in Yangtze River Delta
    CHENG Dan-ya, ZENG Gang
    2023, (6):  1152-1164.  doi:10.11870/cjlyzyyhj202306004
    Abstract ( 78 )   PDF (1903KB) ( 39 )   Save
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    Green technology innovation is one of the important ways to promote regional high-quality development. Based on the panel data of 41 cities at prefecture level and above in Yangtze River Delta region from 2011 to 2019, this paper analyzes the spatio-temporal pattern of industrial carbon dioxide emission and green technology innovation level in Yangtze River Delta region by using ArcGIS spatial analysis and spatial Durbin model, and empirically examines the spatial effect of green technology innovation on industrial carbon dioxide emission. The results show that: (1) Industrial carbon dioxide emissions are at a high level, slightly fluctuating and rising, showing a pattern of high in the east and low in the west, high in the north and low in the south, while the scale of green technology innovation increases year by year, first slowly and then rapidly, showing a pattern of high in the east and low in the west, and the “anti K-shaped” spatial pattern has begun to take shape. (2) The impact of green technology innovation on carbon emissions has a significant spatial transmission effect, and the increase of green technology innovation level of adjacent cities in geographical space and economic geographical space will promote the carbon emission reduction of local cities. (3) Independent green technology innovation has significant effect on restraining industrial carbon emissions. The restraining effect of green technology innovation from neighboring cities on industrial carbon emissions is greater than the promoting effect of green technology innovation in local cities on industrial carbon emissions. Cooperative green technology innovation has no significant effect on industrial carbon emission reduction due to its small scale.The key points to further promote the low-carbon green development of Yangtze River Delta are to deeply explore the coordination, joint defense and control mechanism among cities in the Yangtze River Delta region in promoting carbon emission reduction, and strengthen the construction of regional green technology collaborative innovation network.
    Interactive Influence Between Integrated Large Market and Environmental Governance in Yangtze River Delta: Empirical Analysis Based on Spatial Simultaneous Equation Model
    ZHOU Wu-qi
    2023, (6):  1165-1175.  doi:10.11870/cjlyzyyhj202306005
    Abstract ( 62 )   PDF (858KB) ( 31 )   Save
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    There is an interactive relationship between regional market integration and environmental governance. The higher regional integration of the Yangtze River Delta is inseparable from the improvement of regional environmental governance. This thesis uses the spatial simultaneous equation model and GS3SLS method to analyze the interaction mechanism between market integration and urban environmental governance. The results show that there is a significant interactive influence and mutual promotion between market integration and urban environmental governance, but the market integration in the Yangtze River Delta plays a greater role in promoting urban environmental governance. However, the spatial interactive effect is significantly negative between market integration and urban environmental governance in the Yangtze River Delta. Therefore, in order to improve market integration in the Yangtze River Delta, it is necessary to accelerate the formation of a regional unified large market, innovate the ways for environmental governance to participate in regional market integration in the Yangtze River Delta, and promote the coordination between market integration and environmental governance in the Yangtze River Delta.
    Study on Level and Influencing Factors of Urban Integration in Wuhan Metropolitan Area Based on Space of Flows 
    REN Jun-hu, YU Bin, ZI Ming-gui, ZHANG Han-xia, GUO Xin-wei,
    2023, (6):  1176-1186.  doi:10.11870/cjlyzyyhj202306006
    Abstract ( 139 )   PDF (1516KB) ( 33 )   Save
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    Urban integration is a dynamic process of factor flow and integrated development between cities. The implementation of urban integration is of great significance to coordinated regional development. We took Wuhan Metropolitan Area as the research area and constructed a comprehensive measurement model of the metropolitan area’s urban integration from economic, population, and information flow. We used ArcGIS spatial visualization to analyze the urban integration level and spatial pattern of the Wuhan Metropolitan Area. We inducted the obstacle degree model to explore influencing factors of urban integration. The results showed: (1) Wuhan was the metropolitan area’s economy, population and information centre city. The overall level of urban integration in the Wuhan Metropolitan Area was quite different, and the polarization phenomenon was prominent. (2) The urban integration of the Wuhan Metropolitan Area formed a spatial pattern of “one core, one district, two axes and multiple points”, and it had the spatial characteristics of spatial imbalance, spatial directivity and spatial proximity effect. (3) Infrastructure construction was the key driving force for the urban integration of Wuhan Metropolitan Area, economic development capability was the direct driving force. and residents’ living standards and public service security were the indirect driving force. Based on this study, we put forward some targeted development suggestions, and this paper aims to provide scientific support and case references for the regional construction of urban integration.
    Evolution Characteristics and Influencing Factors of Urban Land Resource Scarcity in Yangtze River Economic Belt
    CHEN Zhuo, XU Cai-cai, ZHANG Yao-yu, WU Yong-xing, ZHANG Ya-zhou, CHEN Li-gen
    2023, (6):  1187-1199.  doi:10.11870/cjlyzyyhj202306007
    Abstract ( 245 )   PDF (2407KB) ( 63 )   Save
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    Reasonable allocation of land elements is the key to supporting the high-quality development of the Yangtze River Economic Belt, and scientific research and judgment on the bottleneck of land scarcity is an important prerequisite for optimizing resource allocation. This paper selects the panel data of 108 prefecture level cities in the Yangtze River Economic Belt from 2008 to 2020, and systematically investigates the spatial and temporal changes, spatial differences and influencing factors of urban land scarcity by using kernel density estimation, GIS spatial analysis, spatial autocorrelation and feasible generalized least squares (FGLS), It provides a useful reference for the realization of high-quality economic and social development supported by land resources in the Yangtze River Basin. The results show that: (1) In the study period, the urban land scarcity in the Yangtze River Economic Belt presents two stages of “acceleration period” and “vibration period”, with specific increases of 26.9%, 13.2% and 9.5% in the upstream, middle reaches and downstream respectively; The results of kernel density estimation show that the high value range of land scarcity gradually decreases, and the low and medium value regions gradually increase. (2) There is a positive spatial correlation between urban land scarcity and the change of local spatial agglomeration range is prominent, but the agglomeration effect is not significant. (3) The leading factors affecting urban land scarcity in different regions are different. Urbanization level, economic development level, population density and foreign direct investment will aggravate the scarcity of land resources, while the upgrading of industrial structure and the improvement of environmental protection level have a certain inhibitory effect. Based on the above conclusions, the Yangtze River Economic Belt should promote the upgrading of industrial structure according to local conditions, increase the investment of enterprises in environmental protection, and break the dilemma of factor scarcity under policy constraints through efficient and sustainable land use.
    Analysis on Characteristics and Attribution of NDVI Interannual Change in Different Ecological Divisions in Anhui Province
    WU Nan, CHEN Ning, CHENG Peng, SONG Ting
    2023, (6):  1200-1207.  doi:10.11870/cjlyzyyhj202306008
    Abstract ( 206 )   PDF (2454KB) ( 110 )   Save
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    Based on the annual NDVI data of vegetation in Anhui Province from 2000 to 2019 and the land cover data in 2000 and 2020, the change characteristics of NDVI data and spatial distribution in the whole province and 5 ecological regions (Huaibei, Jianghuai, West Anhui, Yanjiang, South Anhui) were analyzed using mathematical statistics and spatial overlay analysis methods, and the impact mechanism of human activities (Mainly rapid urbanization process) on vegetation change was quantitatively analyzed by using land cover change indicators. The results show that the regions with an increasing NDVI in the province have a wide distribution and good stability, accounting for 81.5% of the total area. The area and intensity of vegetation coverage improvement in West and South Anhui were significantly higher than those in the other 3 ecological regions. There are few regions with a declining trend in NDVI, and the stability is poor. It is mainly distributed around cities, counties and townships and along the traffic corridor, showing a network radiation. Among the 5 ecological regions, the NDVI in Yanjiang shows the most decline in patches and the highest volatility. Urbanization is the most dominant process of land cover change in the province, which has caused a very significant decline in NDVI to a large extent. However, the continuous natural growth of forest and grass enclosure may bring about a very significant increase of NDVI.
    Historical Reconstruction and Source Analysis of Carbon, Nitrogen and Phosphorus Deposition of Xionghe Reservoir in Water Receiving Area of North Hubei Water Transfer Project
    LIU Wei, YAN Zhi-wei, GAO Jian, LUO Chun-hua, YANG Jia-xiang, WAN Liang, FEI Qiang
    2023, (6):  1208-1219.  doi:10.11870/cjlyzyyhj202306009
    Abstract ( 151 )   PDF (1015KB) ( 45 )   Save
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    The hilly region of northern Hubei is one of the main grain producing areas in China. However, it is characterized with lower rainfall and more polluted water quality. To alleviate water shortage and pollution problems in northern Hubei, Hubei province invested 18 billion to implement the North Hubei Water Resources Transfer Project in 2015. However, there is a lack of understanding of current pollution status of the relevant reservoirs in the receiving area and a lack of knowledge of their carbon, nitrogen and phosphorus pollution history. In this study, a typical receiving reservoir in northern Hubei, Xionghe Reservoir, was selected to establish the chronological sequence of sediment since the construction of Xionghe Reservoir using the sediment 210Pb and 137Cs dating methods, and to reconstruct the effects of human activities and economic development on Xionghe Reservoir since its construction by combining sediment physicochemical analysis and data on population size, Gross Domestic Product (GDP) and grain output in the basin. The results showed that the deposition history of the 34 cm sediment cores XHS(named XHS) of Xionghe Reservoir was about 66 years, spanning 1953-2019, with an average deposition rate of 0.66 cm/a. The total organic carbon content of sediment ranged from 0.57% to 1.56%, total nitrogen content from 0.32 to 1.84 g/kg, and total phosphorus content from 0.97 to 1.91 g/kg. The vertical distribution characteristic of total organic carbon of sediment showed significant positive correlation with the changes of population size, GDP and grain output in Xionghe Reservoir, and the total nitrogen showed significant positive correlation with the changes of grain output in Xionghe Reservoir. TP was positively correlated with Fe/Al-P, Ca-P, IP and OP in the sediment column XHS. Human activities resulted in an increasing trend of TP content and different forms of phosphorus before 1999. Deposition rate showed significant positive correlation with changes in population size, GDP and grain output in Xionghe Reservoir. The vertical distribution characteristic of C/N of sediment indicate that organic carbon was mainly derived from phytoplankton during the periods 1981-1996 and 2012-2019, and from a mixture of phytoplankton and terrestrial plant inputs during the periods 1963-1970 and 2006-2009.
    Spatial Distribution Characteristics and Identification of Key Environmental Factors for Juvenile Silver Carp in Upper Reaches of Yangtze River
    PU Yan, YANG Hao, TIAN Hui-wu, DENG Hua-tang, NI Wen-jing, WEI Nian, DUAN Xin-bin, LIU Shao-ping, CHEN Da-qing,
    2023, (6):  1220-1228.  doi:10.11870/cjlyzyyhj202306010
    Abstract ( 82 )   PDF (939KB) ( 32 )   Save
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    The silver carp (Hypophthalmichthys molitrix) is an important economic fish in the Yangtze River's middle and upper layers. Based on the survey data of fishery resources and environmental data collected from the upper Reaches of the Yangtze River to the Three Gorges reservoir area in 2019-2020, we analyzed the spatial distribution characteristics of resource density of juvenile silver carp, as well as the environmental factors influencing its spatial distribution using the generalized additive model (GAM). The environmental factors were selected using Pearson’s correlation analysis to determine whether they were significantly correlated and to verify that the variables in the model were independent. Thereafter, the best model was determined by a minimum Akaike information criterion (AIC). The results show that the resource density of juvenile silver carp in the upper reaches of the Yangtze River has obvious spatial distribution characteristics, mainly concentrated in the Fengdu River section at the tail of the Three Gorges Reservoir. GAM analysis revealed that the main factors influencing the resource density and distribution of juvenile silver carp were flow velocity, plankton density, distance from the dam and water temperature in the upper Reaches of the Yangtze River, and the flow velocity having the highest deviance explained (57.7%). The resource density of juvenile silver carp shows a decreasing trend with increasing flow velocity, and is mostly distributed in the range of 0.10-0.55 m/s. The resource density of juvenile silver carp increases with increasing plankton density and distance from the dam, indicating a significant linear relationship between these variables and the resource density of silver carp. There was a multi-peak nonlinear relationship between the resource density of juvenile silver carp and the water temperature. With the increase of water temperature, the resource density of juvenile silver carp showed a slow upward trend, and the resource density of juvenile silver carp was mainly distributed in the range of 18℃-21.5℃. This result reveals the effects of flow velocity, plankton density, distance from the dam and water temperature in the upper reaches of the Yangtze River on the density distribution of juvenile silver carp. Therefore, it is necessary to strengthen the habitat protection of slow-flowing habitats at the tail of the reservoir and the confluence of trunk and tributaries to provide the basis for the recovery of silver carp population resources.
    Early-stage Resources of Drifting Egg Fishes in Jinping Bend, Lower Yalong River
    SHAO Ke, HU Xing-kun, DONG Wei-wei, XIONG Mei-hua, WANG E-zhou, YU Dan, ZHU Bin
    2023, (6):  1229-1237.  doi:10.11870/cjlyzyyhj202306011
    Abstract ( 51 )   PDF (1000KB) ( 118 )   Save
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    This study conducted to investigate the status of early-stage fish resources in Jinping bend in the lower reaches of the Yalong River in 2019 and 2020. The results showed that there were 19 fish species in 4 families and 2 orders. Among these, 7 species spawned drifting eggs, 5 out of which were endemic to the upper reaches of the Yangtze River. These were Leptobotia elongata, Jinshaia sinensis, Jinshaia abbreviata, Sinibotia reevesae, and Coreius guichenoti. The number of fish eggs flowed through the Lizhuang section was estimated to be 103.07×104 and 388.58×104 in 2019 and 2020, respectively, and the dominant species were Jinshaia sinensis and Lepturichthys fimbriata. According to the analysis, there were many spawning sites of fish drifting upstream of the Lizhuang section, and the larger spawning grounds were mainly located in the Yandai, Nanhe-Qingna, and Lizhuang sections from upstream to downstream. Species composition of drifting fish eggs was similar to historical studies, but the spawning scale was on the decline, especially those river migratory fishes such as Leptobotia elongata, Coreius guichenoti and Rhinogobio ventralis, which spawned sporadically only in the present survey. Although affected by many factors such as hydropower cascade exploitation, overfishing, sand mining and gold digging, as the longest flowing section in the lower reaches of the Yalong River, the Jinping bend is still a crucial distribution area for breeding of many fishes, and the spawning scale has gradually increased in recent years. On the basis of existing protection measures, we suggested expanding the scope of the existing reserve to protect the fish spawning habitats, restoring river connectivity to meet the demand of migration, and optimizing ecological operation, to effectively protect fish resources in Jinping bend of the lower Yalong River.
    Land Use Transition and Associated Eco-Environmental Effects in the Taihu Lake City Cluster
    FENG Xin-hui, LI Yan, YU Er, YANG Jia-yu, LI Yi, WANG Shi-yi
    2023, (6):  1238-1253.  doi:10.11870/cjlyzyyhj202306012
    Abstract ( 158 )   PDF (6749KB) ( 106 )   Save
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    The exploration of the eco-environmental effects caused by land use transition is of great significance to promote the sustainable development of regional economy and improve the eco-environment. Taking the Taihu Lake city cluster as an example, this paper used the GIS spatial analysis method and integrated the measurement results of the eco-environmental quality index and ecosystem services function to reveal the eco-environmental effects brought about by land use transition and identify salient regions. The results showed that: (1) During 2000-2018, the transition from agricultural production land to living land was the main feature of the land use transition, with a total of 3 054.3 km2 transferred out, and the overall change in ecological land was slow, but the area of water ecological land fluctuated considerably. The order degree of land system in the suburbs of Southern Jiangsu had increased rapidly, and the disorder degree of land use in the northeast and south of the study area had increased; (2) The overall eco-environmental quality continued to decline from 0.407 to 0.392. The regional habitat quality decreased from 0.328 to 0.303. The high-value areas of carbon sequestration were concentrated in the southwestern part of Huzhou, while the low-value areas were concentrated in the northeastern part of Suzhou. The total water supply rose from 157.33 billion m3 to 165.41 billion m3. The high-value areas of recreational services were concentrated in the southwestern part of Huzhou and around Taihu Lake, while the low-value areas were concentrated in the centre of Taihu Lake and the southeastern part of Jiaxing; (3) The average eco-environmental comprehensive index had decreased by 0.026. The decline was the most serious in the middle of Suzhou, forming extensive cold spot regions. The eco-environmental status in the east of Zhangjiagang and the west of Liyang had improved, forming many local hot spot regions; (4) Four types of regions where land use transition affected the eco-environment were identified: LC-EC region was the most extensive, mainly distributing in the northeast of the region; LH-EC region was mainly distributed in the suburbs and some rural areas; LC-EH region had minimum area and were mainly distributed in Wuxi and Taihu Lake scenic area; LH-EH region was mainly distributed in Zhangjiagang and Huzhou. The results can provide a scientific reference for coordinating the development of regional land resources and improving the eco-environment.
    River Health Assessment of Qingyi River Based on Benthic Macroinvertebrates
    SUN Jiu-xing, XU Guang-lai, CHI Jian-yu, YANG Yi-ran
    2023, (6):  1254-1266.  doi:10.11870/cjlyzyyhj202306013
    Abstract ( 169 )   PDF (2347KB) ( 29 )   Save
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    Watershed ecosystem assessment based on macroinvertebrate community structure is an effective tool for regional water environment monitoring. We conducted biological sampling of macroinvertebrates and monitoring of physicochemical factors of water bodies at 10 sampling sites in the Qingyi River Basin in July 2021, and elaborated the characteristics of macroinvertebrate community structure and its relationship with the environment based on methods such as bio-environmental analysis and abundance/biomass curve, and applied the Water environment Quality and Comprehensive Index (WQI) was applied to comprehensively evaluate the health of rivers in the basin. The results showed that the macroinvertebrate community in the Qingyi River Basin was composed mainly of aquatic insects and mollusks, with gatherer/collector as the main functional feeding group, and the main dominant species were Cipangopaludina chinensis, Hydropsyche, Macrobrachium nipponensis and Bellamya quadrata. The community diversity was good and had significant spatial heterogeneity. Bio-environmental analyses showed that the dominant factors explaining the differences in macroinvertebrate community structure were dissolved oxygen, river width, water temperature, chemical oxygen demand, flow rate, total phosphorus, and water depth. The optimal combination of factors was dissolved oxygen, total phosphorus, and chemical oxygen demand. The abundance/biomass curve showed that several points were disturbed to different degrees. From the WQI index analysis, it can be concluded that the water quality in the watershed was good, except for a few points, the overall state was healthy and above. Compared with the biological evaluation and physical and chemical factor evaluation, the WQI index evaluation method can reflect the watershed health condition comprehensively and is more applicable.
    Distribution of Heavy Metals in Sediments of Nanyi Lake and Its Potential Ecological Risk Assessment
    LI Guo-lian, LI Xiao, ZHANG Yu, LI Hai-bin, XIE Fa-zhi, SHU Ying, LI Wei-hua
    2023, (6):  1267-1280.  doi:10.11870/cjlyzyyhj202306014
    Abstract ( 127 )   PDF (1678KB) ( 180 )   Save
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    In recent years, with the rapid economic development of the Yangtze River Basin, the local government has attached great importance to the deterioration of the water quality of Nanyi Lake, the lake of the South Bank of the lower reaches of the Yangtze River. In this study, 39 samples were collected from surface sediments of the whole lake area and 6 surface water samples from the main inlet and outlet tributaries, and the contents and distribution patterns of heavy metals As, Cr, Cu, Mn, Ni, Pb, Zn and the contents of TOC and TN in the sediments of Nanyi Lake were analyzed.The pollution degree and ecological risk of heavy metals in sediments were evaluated, and the pollution sources of Nanyi Lake were analyzed by principal component analysis and correlation analysis.The results showed that the average concentration of Pb in interstitial water exceeded the Criteria Continuous Concentration (CCC) of the National Recommended Water Quality Criteria.The average contents of As, Cr, Cu, Mn, Ni, Pb and Zn in sediments were higher than the river background value in the Jianghuai River Basin of Anhui Province, and the multiples exceeding the background value were Pb (3.36)>Mn (2.74)>Zn (2.51)>As (1.80)>Cu (1.40)>Ni (1.34)>Cr (1.13). Fractions of heavy metals analysis showed that As, Cr, Ni and Pb existed mainly in residual fractions (F4), while Zn was dominated by the non-residual fraction ( F1 + F2 + F3) with a mass fraction of 54%, and the reducible fraction (F2) of Mn was 37.4% in East Lake, the sulfide and organic matter bound state (F3) of Cu in the West Lake accounted for 26.7%. The potential ecological risk assessment method of heavy metals showed that Pb was a medium-risk in 13 sampling site. The average value and order of heavy metal partition coefficient (lgKd) in sediments were Cr (4.80)>Zn(4.50)>Cu(4.43)>Pb(4.37)>Ni(4.31)>As(4.27)>Mn(2.73). The principal component analysis and correlation analysis and spatial distribution showed that the water pollution of Nanyi Lake mainly came from the industrial wastewater collected by the rivers entering the lake, aquaculture and aquatic biodegradation in the lake, as well as the non-point source input from the surrounding agriculture and residents' lives. Based on the high ecological risk of Pb in the whole lake area, we should continue to pay attention to the impact of heavy metal Pb on the water environment and ecosystem of Nanyi Lake.
    Distribution of Heavy Metal and Human Health Risk Assessment of Water Bodies in the Basin of Poyang Lake Into the Yangtze River
    WANG Zhi-gang, ZHAN Hua-ming, XU Li-gang, GUO Hao-kun, LI Jia-le
    2023, (6):  1281-1290.  doi:10.11870/cjlyzyyhj202306015
    Abstract ( 205 )   PDF (1166KB) ( 109 )   Save
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    Samples were collected in 2022 in the basin of Poyang Lake into the Yangtze River to analyze the spatial distribution characteristics and sources of heavy metals in the surface water and groundwater and to evaluate the risk of heavy metals to human health. The major cations and anions in the water from the study area were Ca2+, and HCO3- and SO42-, respectively. Water-rock interaction was the primary source of the chemical components of groundwater. The average concentration of heavy metals in the surface water was in the order of Cr>Fe>Zn>Pb>Cu>Mn. Cr concentration had the most significant variation range. Cr and Fe contributed the most to the total concentration of heavy metals in surface water, accounting for 54.36% and 19.50%, respectively. The average concentration of heavy metals in groundwater was in the order of Mn>Fe>Cr>Zn>Pb>Cu. Heavy metal pollution in the study area may come from wastewater discharged from smelters and urban industries. Cr had the highest risk to human health in both surface water and groundwater. The HQder and HI values of Cr in surface water were >1, followed by Pb. The HQder and HI values of Cr in groundwater were >1, followed by Mn. This study provides a scientific basis for the protection of groundwater resources and the safety of drinking water in Poyang Lake Basin.
    Remote Sensing Monitoring and Spatial Temporal Pattern Evolution Analysis of the Vegetation Ecosystem Quality in the Danjiangkou Reservoir Area from 2001 to 2020 
    LU Li-jie, WANG Li-hui, LI Yang, ZHAO Peng-cheng, YANG Qi-chi, FENG Qi , XIAO Fei, DU Yun, LING Feng
    2023, (6):  1291-1304.  doi:10.11870/cjlyzyyhj202306016
    Abstract ( 49 )   PDF (9064KB) ( 84 )   Save
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    Danjiangkou Reservoir is the core water source of China’s South-to-North Water Diversion Project, and the quality of the reservoir’s ecosystem is a prerequisite to ensure the safe operation of the reservoir and the sustainable northward transmission of “a flood of clear water”. In this paper, by obtaining high-precision and fine-grained ecosystem type of Danjiangkou reservoir area, we construct a remote sensing assessment model of vegetation ecosystem quality based on the ecological parameters such as Fractional Vegetation Cover (FVC), Leaf Area Index (LAI) and Gross Primary Productivity (GPP) to evaluate the vegetation ecosystem quality and analyze its spatial and temporal dynamic changes from 2001 to 2020. The results show that (1) From 2001 to 2020, the vegetation ecosystem quality in the Danjiangkou reservoir area showed a significant upward trend, and the EQI(Ecosystem Quality Indices) in 2001 and 2020 are 56.16 and 78.32, respectively. The increment of vegetation ecosystem quality is higher than 15 in 81.32% of the total area. (2) Ecosystem quality varies among counties (cities and districts); the ecosystem quality index of Xichuan County and Danjiangkou City is lower than the average level of the reservoir area in 2001 and 2020, but the ecosystem quality index has the highest increment, increasing by 25.55 and 23.99, respectively. (3) Among the different ecosystem types, the forest ecosystem quality index is the highest, but the increment is lower. (4) From 2001 to 2020, the ecosystem quality index has a positive correlation with the increase of slope and the increase of ecosystem quality index was the largest in the areas of 0°-3°. When the slope became steeper, the increment of vegetation ecosystem quality raises with increase of slope grade on slopes between 3°-15° and reached the top at slope 8°-15°, afterwards, dropped down. (5) The absolute value of the bias correlation coefficient between ecosystem quality index and precipitation was significantly higher than that between temperature and ecosystem quality index, revealing that the ecosystem quality index was more significantly influenced by precipitation than by temperature. The research results can provide data support for ecological protection policy formulation, ecological protection spatial control and decision making in the Danjiangkou reservoir area, and are of great significance for ecological security and water source protection in the reservoir area.

    Differences in the Spatial and Temporal Distribution and Influencing Factors in the #br# Water Environment of Rivers and Lakes in the Dianchi Basin#br#
    ZHU Tian-yuan, ZHAO Hai-xia, FAN Jin-ding, WANG Jun-qi, GU Bin-jie
    2023, (6):  1305-1316.  doi:10.11870/cjlyzyyhj202306017
    Abstract ( 55 )   PDF (3491KB) ( 71 )   Save
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    The Dianchi basin is the most intense area of human activity in Yunnan Province, and inevitably faces enormous pressure on the water environment in the process of economic development. The study of the spatial and temporal variability of the water environment in the Dianchi basin and the mechanisms of its changes are important for further balancing the relationship between development and conservation. This paper successively analyses the spatial and temporal variability of water quality in the main rivers entering the Dianchi basin and the spatial variability of ecological health of Dianchi Lake, and analyses the driving factors using geographic probes. The results show that there is significant spatial and temporal variation in the water environment of the Dianchi basin: (1) From 2010 to 2020, the water quality of the major rivers in the Dianchi basin has improved significantly. From 2010 to 2015, we saw significant elimination of poor category V rivers while from 2015 to 2020 we saw a shift to category II and III water quality in more rivers. (2) In 2020, there is spatial heterogeneity in the quality of the water environment. The water quality of Caohai is better than that of the Waihai, but the lake itself is in a sub-healthy state. (3) Changes in the quality of the water environment in the Dianchi basin are influenced by a combination of factors, of which policy optimisation and pollution reduction and expansion are the best solutions to improve the water environment in the Dianchi basin, and the interaction of population and construction land growth has put greater pressure on the water environment in the Dianchi basin. 
    Study on Spatial and Temporal Differentiation and Optimization Path of Collaborative Pollution Control in Urban Agglomerations of China
    ZENG Peng, WEI Xu, DUAN Zhi-cheng
    2023, (6):  1317-1333.  doi:10.11870/cjlyzyyhj202306018
    Abstract ( 63 )   PDF (7601KB) ( 36 )   Save
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    Urban agglomeration is a spatial carrier of the concept of cross-administrative divisions. How to discuss the collaborative governance of environmental pollution from the perspective of urban agglomeration has become a focus topic in recent years in the study of regional development and man-land relationship. Firstly, according to the theory of urban ecology, the theory of new economic geography and the theory of spatial justice, the "food chain principle of urban agglomeration" is proposed, and based on this, the conceptual model of urban agglomeration pollution cooperative governance is constructed. Then use of entropy TOPSIS method, improve the collaborative model, kernel density estimation, the space gravity model analyzes the pollution control level is the basic pattern of urban agglomerations, and the evolution process of urban agglomeration pollution together contact, space structure and the overall development situation has carried on the exploration, finally on this basis puts forward the optimal path of different urban agglomeration. The above results show that: (1) the pollution control pattern of each city in the urban agglomeration shows a distribution of wide in the middle and narrow at both ends; (2) The level of collaborative pollution control in urban agglomerations decreased from national urban agglomerations to regional and regional urban agglomerations; (3) Third, the spatial linkage strength of collaborative pollution control in urban agglomeration was mainly affected by geographical proximity and provincial boundary effect; (4) The collaborative control of pollution in urban agglomerations is mainly affected by the pressure of pollution control and the response of pollution control, and different urban agglomerations are affected by the subsystems differently. Finally, based on the results of difference analysis, the paper puts forward the path optimization suggestions of pollution collaborative governance for different types of urban agglomerations.
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