Based on the logical relationship between population urbanization rate and Industrial upgrading, this paper establishes the index of industrial upgrading by using the cross-sectional data of 2 271 counties in 1990, 2000 and 2010, so as to analyze the temporal and spatial differences of the coupling relationship between them. The results showed that: (1) The static coupling coordination degree between population urbanization and industrial upgrading in China’s counties increased with the passage of time, and showed significant spatial distribution characteristics of decreasing order from east to west. (2) The dynamic coupling characteristics of population urbanization and industrial upgrading could be divided into four types: recession, lagging, advanced and growth. The transformation between different types also reflected the space-time dependence. The eastern part of Hu Huanyong Line has mainly transformed from “advanced” to “growth” while the western part is just the opposite. （3) The average altitude and the proportion of population with high school education or above have significant influence on the coupling relationship at different stages,in addition, location conditions, population and employment, non-agricultural degree and other factors have an impact on the coupling relationship, and the influence is gradually significant.

How to coordinate the relationship among economy, ecological environment and social welfare is an important task of sustainable development. This paper uses the super efficiency SBM model to measure the ecological welfare performance of the Yangtze River Economic Belt in 2007-2017, uses the barycenter model and spatial interpolation method to describe the spatial pattern evolution of the ecological welfare performance, and on this basis, uses the vector autoregressive model to analyze the dynamic response relationship between the ecological welfare performance and its influencing factors.The main conclusions are as follows: (1) from 2007 to 2017, the ecological welfare performance of the Yangtze River Economic Belt shows an upward trend in the early stage, but decreases in the later, and its overall value is low, which is mainly affected by scale efficiency.（2) On the whole, the track of the performance’s gravity center moves eastward and northward,and the high value areas are mainly concentrated in the middle reaches of the Yangtze River.From the perspective of spatial pattern, the ecological welfare performance in the middle and lower reaches of the region takes Hunan Province and Shanghai City as the high value centers respectively, which decreases from circle to circle, showing a more significant spatial structure of “core-periphery” .However, the overall performance of the upstream region is gradually lagging behind.(3) The impact of scale effect on the performance of ecological welfare is not significant in the current period. Its response value reaches the maximum value in the second period, and fluctuates near zero value in the sixth to tenth periods; the structural effect always shows negative impact, and the overall range of change is small; while the frequency of negative response of technical effect is significantly higher than that of positive.From the perspective of variance decomposition, performance is basically impacted by itself, but in the later stage, the contribution rate of its influencing factors has increase in varying degrees.

Against the backdrop of innovative development strategy and knowledge economy, intercity knowledge flows have become an important perspective to explore intercity relationship and spatial reconstruction. Therefore, knowledge collaboration network based on scientific co-publications has attracted much attention. Based on scientific publication data during 2015-2019 derived from Web of Science, the intercity knowledge collaboration network of the Yangtze River Delta (YRD) was constructed by employing crawler technology, in which nodes represented cities at the prefecture level and above. After that, spatial patterns and influencing factors were analyzed through the lens of dyadic strength, node centrality, and QAP regression. The results have shown that: (1) Knowledge flows in YRD is concentrated in the Z-shape development corridor of Shanghai-Nanjing-Hefei-Hangzhou-Ningbo, presenting obvious “rich-club” phenomenon. Nanjing has the strongest knowledge productivity and control power in YRD. The intercity collaboration between Jiangsu and other cities is relatively high and balanced, showing a multi-polar development. The intercity collaboration in Anhui is sparse, which mainly depends on the development of Hefei’s external collaboration. Zhejiang’s situation lies in between and the intercity collaboration is organized by Hangzhou and Ningbo. (2) Population, R&D, universities have a positive effect on intercity knowledge collaboration, among which universities have the strongest and most significant impact. The distance decay still exists, and administrative boundary could hinder intercity collaboration to some extent, but it’s effect is much smaller than the distance damping. Cultural proximity has no significant impact on knowledge collaboration, whereas administrative hierarchy matters.

Spatial scope definition and function identification is not only the basis of theoretical study of shipping cluster area,but also the precondition for industry and urban planning decisions. Previous studies have mostly focused on the qualitative description, and the precise definition of spatial scope and quantitative identification of functions are still rare. Based on the address and business scope of shipping service enterprises(organizations) in 2019,this paper uses G index, G* index and keyword co-occurrence network to define the spatial scope and identify the functions of Shanghai shipping service clusters.The results show that: (1) the distribution of the whole and sub industry of Shanghai shipping service industry are high value clusters, and eight shipping service clusters have been formed. (2) The important function elements are highly overlapped in “warehousing”, “international freight forwarding” and “cargo transportation”, and the key function elements are highly correlated to port shipping industry, special regulatory policies and local industries. (3) There are significant differences in the function element cluster of different types: the endogenous type includes Jinshan area, Changxing island area and Baoshan area,which are dominated by warehousing, transportation and local industry extension.Function clusters include “road freight transportation”, “miscellaneous labor”, “ship equipment and accessories”. The exogenous type includes Waigaoqiao area, Pudong airport area and Lingang area. Function clusters are mainly composed of modern logistics and advanced business forms, including “inter enterprise trade and agency”, “international shipping agency”, “residual value treatment and maintenance of leased property”, etc. The mixed type includes the North bund and Lujiazui area.The funcion clusters include “ship engineering”, “supply chain management”, “exhibition service”, etc.

Under the background of ecological civilization construction, national park has become the top priority in the management system reform of natural protected areas in China. As the core stakeholders of national parks, community residents are not only the main body to protect natural ecosystems, but also the key to the sustainable development of tourism. Based on the prism model of sustainable tourism development, this paper introduces satisfaction as an intermediary variable to build a structural relationship model of residents’ sustainable perception and support, which extends the applicability of Prism of Sustainability in the study of national parks of China. The research use the interpretation method of mixed research methods and take 3 communities (Muyu , Hongping , Xiaguping ) in different spatial locations in the Shennongjia NP as empirical research objects, and obtain survey data through questionnaire survey and in-depth interview. And then Structural Equation Model and factor analysis and in-depth interview material were used to conduct empirical research. The results indicated that：(1）The economic dimension plays a leading role in transitional and marginal communities, and the institutional dimension in the core community becomes a key factor affecting residents’ satisfaction；(2）The construction of NP and the development of eco-tourism have a significant impact on residents’ quality of life and environmental cognition, and shows obvious regional differences;(3）Satisfaction has a significant positive effect on residents’ support , and mediating utility decreases with distance;(4) The spatial differentiation of the residents’ sustainable perception in the Shennongjia NP community shows a unique regularity and do not conform to regional attenuation law. Therefore, in the construction process of Shennongjia NP, we should comprehensively measure the tourism development effect, pay attention to the core demands of residents, and improve the community participation mechanism, and improve the benefit distribution system and bring the fruits of development to all residents. And adopt differentiated community development path, so as to improve residents’ support for tourism development.

In order to investigate the pollution status of Cryptosporidium and Giardia in the Yangtze River Basin， 34 water samples were collected from 17 sampling points in 7 provinces and cities along the Yangtze River Basin in the flood season (July) and the dry season (November). Cryptosporidium oocysts and Giardia cysts were detected and counted under a microscope following a method involving concentration with precipitation， separation with density gradient and fluorescent staining. The results showed that the total detection rate of oocysts or cysts was 61.76%， while the detection rates of oocysts or cysts in the flood and dry season samples were 58.52% and 64.71%， respectively. From a regional perspective， the detection rate of Cryptosporidium in Sichuan Province was the lowest， i.e. 12.5%， while those in Hubei Province and Anhui Province were the highest， both with 75%. In addition， the detection rates of both Cryptosporidium and Giardia in Hubei Province were relatively high. The results of this study showed that all regions of the Yangtze River were polluted by Cryptosporidium and Giardia to varying degrees， and there were certain hidden dangers in water safety， especially when it used as a source of drinking water. It is necessary to strengthen the monitoring of water treatment removal efficiency to ensure the safety of drinking water for residents.

In order to explore the effect of ecological operation of Three Gorges Reservoir on breeding of the Four Major Chinese Carps in Yichang River Section of the Yangtze River, and identify the key ecological and hydrological indexes that affect the natural reproduction of the Four Major Chinese Carps, we investigated the early life resources of the Four Major Chinese Carps in Yichang section of the middle reaches of the Yangtze River, from May to July, 2014-2020. Correlation analysis was made between the Four Major Chinese carps’ spawning and larvae collected and the ecological hydrology index. The results showed that: (1) We estimated that 1.76-86.11×108 ind eggs of the Four Major Chinese Carps drifted through Yichang River Section from 2014 to 2020, which showed an overall increasing change. There were 16 breeding peaks of the Four Major Chinese Carps, mainly from late May to late June. Silver carp (accounting for 61.12%) and Grass carp (accounting for 30.77%) were dominant species in egg composition of the Four Major Chinese Carps, and Bighead carp and Black carp accounted for 3.45% and 4.64% respectively. The spawning time of Grass carp and Silver carp lasted longer, while the spawning time of Black carp and Bighead carp appeared relatively later. (2) Among the 11 ecological operation carried out by the Three Gorges Reservoir from 2014 to 2020, there were 9 corresponding breeding peaks of the Four Major Chinese carps. Except for 2020, the spawning quantity during ecological operation accounted for a large proportion of that during monitoring period，with a range from 20.15% to 78.35%. The daily runoff of the Four Major Chinese Carps’ eggs during the ecological operation period was higher than that during the non-ecological operation period, which proved that the implementation of ecological operation can promote the natural reproduction of the Four Major Chinese Carp. (3) The daily fish egg density was significantly positively related to flow rate changes during the breeding period of the Four Major Chinese Carps in each year(R=0.72~0.97, p<0.05), and the spawning scale during each breeding peak period was significantly positively correlated with the flow rate growth rate (R=0.802,p<0.01), indicating that the flooding process in Yichang River Section can effectively stimulate the natural reproduction activities of the Four Major Chinese Carps. (4) In the Yichang River section, the suitable flow range for the reproduction of the Four Major Chinese Carps is 10 000~25 000 m3/s, and the suitable water temperature range for the reproduction of the Four Major Chinese Carps is 21.0℃~23.8℃. The hydrological conditions of the Yichang River section should meet following conditions will conducive to the breeding activities of the Four Major Chinese Carps in the Yichang River section: the flow range is 10 000~25 000 m³/s, the water temperature range is 21.0℃~23.8℃, the daily average flow increases by more than 2 000 m3/s·d, the water level continues to rise for 4 days.

Based on the vegetation NDVI data, meteorological data and land use data of the growing season, trend analysis and multiple regression residual analysis are used to analyze the spatiotemporal variation characteristics of vegetation NDVI in Guizhou province from 1998 to 2018, and the relationship between vegetation NDVI and climatic factors and human activities is discussed.The results show that:(1)In Guizhou province,the annual variation of NDVI of vegetation in nearly 21a increased with a rate of 0.63×10^-2a^-1(P<0.01),and about 88.05% of the regional vegetation NDVI presented an increasing trend, while only 1.12% of the pixel presented a decreasing trend.The growth rate of vegetation NDVI in 9 cities and counties ranged from 0.84×10^-2a^-1(Liupanshui) to 0.42×10^-2a^-1(Qiandongnan).(2)In the near 21a,Qiandongnan and Guiyang are the two regions that contribute more than 50% to climate change, while seven regions contribute more than 50% to human activities and climate change, with a relatively high contribution rate of Liupanshui (73.67%), and the rest all contribute less than 70%.(3)Generally speaking, in the past 21 years,climate change has promoted vegetation in Guizhou province,and the promotion effect of human activities is greater than the inhibition effect, that is, the joint effect of climate change and human activities is the reason for vegetation restoration in most areas of Guizhou Province.

Mechanical damage surface refers to the bare surface, which has texture characteristics and has not been restored by vegetation after large-scale mechanical engineering construction. Due to the influence of open-cut mining and engineering construction, the mechanical damage surfaces in Tang Langchuan basin are densely distributed. It is of great significance to extract the spatial distribution information of the mechanical damage surface quickly and accurately, which strengthen and protect the ecological environment construction in the watershed.However, there are currently few effective methods for extracting mechanical damage surfaces. In response to this problem, a typical area with densely distributed mechanical damage surfaces in the basin is selected as the research object. The remote sensing image of GF-2 is used as the data source and the object-oriented classification method is adopted. After dividing the research area with the optimal scale, fuzzy classification rules are constructed for the typical features in the research area. The information is extracted hierarchically according to the type of the features and got the object types in the study area distribution, achieving mechanical damage surface of remote sensing information extraction. The confusion matrix method based on pixel file (TTA Mask) was used to evaluate the classification accuracy. The overall classification accuracy reached 90% and the Kappa coefficient is 0.78. Compared with other traditional classification methods, the Maximum Likelihood Classification has the best classification method. The overall classification accuracy is 75% and the Kappa coefficient is 0.66, which is far lower than the accuracy of the proposed method in this paper. There are some errors such as dividing the mechanical damage surface into woodland and traffic land, incomplete road classification and so on, the classification effect is general. By comparing the results with the classification accuracy, the classification accuracy is improved obviously and the misclassification of ground objects is reduced, which indicates that the method proposed in this paper has better feasibility and superiority in extracting mechanical damage surface. The research results provide a technical support for the rapid extraction of mechanical damage surfaces in this basin and other similar areas, providing a reference for similar studies.

With the acceleration of urbanization in the Yangtze River economic belt, a series of ecological security problems have emerged, which seriously restrict the development of the Yangtze River economic belt. The research on ecological security early warning is helpful to discover the factors threatening ecological security in time, and forecast and warn the future development trend of ecological security, so as to achieve “pre-control”. This article takes the whole basin of “eleven provinces and cities” in the Yangtze River economic belt as the research area, and constructs an ecological security early warning index system based on the PSR model. Then, establishes a simulation model of urban ecological security system by the system dynamics theory, which aiming to reveal the characteristics of ecological security changes in the Yangtze River economic belt from 2007 to 2025 and provide a theoretical basis for ecological security early warning. The research show that: (1) From 2007 to 2025, the overall ecological security level of 11 provinces in the Yangtze River Economic Belt will increase year by year, and the trend will be more significant after 2013. (2) The difference of ecological security between regions is significant, showing the spatial characteristics of “higher in the East and West, lower in the middle”. (3) In terms of indicators, fixed asset investment, urbanization rate and the proportion of environmental protection investment in GDP have the greatest impact on the pressure, state and response of ecological security.

This study focuses on 50 water quality monitoring sections in Changzhou in 2018 to explore the response of water quality indexes (NH3-N, CODMn, BOD5, TN, and TP) to land use patterns of riparian zone at different terrain (hill and plain) and buffer zones (25, 50, 200, 500 and 1 000 m) by using spearman, RDA and other mathematical statistical methods, which in order to provide scientific suggestions for water environment management. The results showed that the response of water quality index to land use pattern in hilly areas was more significant compared with plain area. In the hilly region, the interpretation of land use pattern to water quality index was higher in the buffer zone of 25 and 200 m. But in the plain area, the high degree of interpretation for water quality index is in the 50 m buffer zone. The effects of different land use patterns on water quality index is heterogeneity, like forest land and garden land were significantly positively correlated with water quality, while cultivated land and residential land were significantly negatively correlated with water quality. All above study indicates that when facing water environment management oriented to water quality objectives, land use pattern within 200m distance from the riparian zone should be optimized in hilly areas, simultaneously, it should be strengthened in plain areas within 50 m distance from the riparian zone at least.

In the paper, a new tripartite evolutionary game model analyzing collaborative governance path of cross regional pollution in Urban Agglomeration is constructed based on decentralized environmental regulation. In order to solve environmental problems under aggregate development, cooperative parameters of local government, including governance cost, opportunity cost and governance income, and policy parameters of the central government such as economic incentives and subsidies are mainly considered. Moreover, the strategy selection of different subjects is studied which discusses the influencing factors and interaction relationship. And the equilibrium stability strategy of the system with existence conditions is determined. At last, the evolution process of different strategy combinations is simulated. Then some suggestions are put forward to establish incentive and restraint mechanism, joint prevention and control mechanism, and regional integration and coordination mechanism. The results are shown below. For local governments, the probability of choosing cooperative behavior will increase with the probability of other local governments choosing cooperative behavior and the probability of central government choosing strict supervision. While the probability of central government choosing strict supervision will increase with the decrease of the probability of local government choosing cooperative behavior. The evolution speed of system stability strategy is affected by the proportion of its own and other agents’ strategy selection. No matter how the proportion value changes, the final strategy decision of the group will not be changed.

Under the influence of mining, surface water and soil were seriously polluted by the acid mine drainage of Lujiang alunite mine. However, due to the long history of mining development, the mining and collapse of the mining area are serious, and sources of the acidic drainage is not clear, which seriously affects the process of pollution control in mining area. Water samples from different water bodies of alunite mine were collected, such as fissure water, well water, channel water, subsidence area water, rain water, adit water and so on, analysis of characteristics of hydrogen and oxygen stable isotopes was carried out, the direct comparison method and MixSIAR model were adopted to explicit sources of the adit water and the contribution ratio of different water to it, on this basis, combined with testing results of different water quality,alum ore and slag composition, the formation mechanism of acidic drainage in adit was explored. The results show that water in subsidence areas mainly comes from rainfall, but it is greatly affected by evaporation, and it is relatively rich in heavy isotopes, which is quite different from the stable isotopic composition of hydrogen and oxygen of groundwater. The precipitation can recharge the shallow groundwater, but it has a certain hysteresis effect. The precipitation and fissure water may feed the channel water and the channel water may also feed the shallow groundwater. Well water, fissure water, channel water and rainwater may be the main replenishment sources of mine adit water. For the contribution ratio of different water bodies to the adit water, the results of the first sampling in descending order are rainwater 39.1%, groundwater 36.4% and channel water 24.5%.The results of the second sampling in descending order are underground water 56.6%, channel water 30.9%, and rainwater 12.5%. The contribution ratios of rainwater in the two sampling to the mine adit water are quite different, which may be due to the different precipitation. Alum hydrolysis is the main formation mechanism of acidic mine waste water, and pyrite oxidation is also one of the reasons for forming acidic mine waste water. The goaf above the adit provides good conditions for the formation of acidic drainage —plenty of oxygen and water. Those results should provide scientific reference for acid mine drainage pollution control, soil related risks reduction and ecological restoration.

Exploring water quality status, water problems and pollution sources in the Qinhuai River catchment is the basis for the improvement and protection of water environment, which is of great significance to constructing ecological civilization. Water quality parameters at 29 sites were investigated from January 2015 to December 2019 in the Qinhuai River catchment, Nanjing, China. The Nemeiro pollution index method and positive matrix factorization (PMF) were used to determine the water quality status and pollution sources. The results showed that nitrogen pollution and organic pollution were the most important types of pollution in the Qinhuai River Basin, of which TN pollution was the most deteriorated one. A improving trend of water quality was observed at the interannual scale, while the water quality in the non-flood season was worse than that in the flood season on the seasonal scale. Water quality parameters displayed different spatial distribution patterns during flood season and non-flood season, and the high-polluted areas were mainly concentrated in the lower reaches of the Qinhuai River and Jiangnang University Town. The results of PMF indicated that the contribution rates of pollution sources displayed different temporal distribution patterns during flood season and non-flood season. Domestic sewage and business service sewage, non-point source pollution, industrial wastewater contributed largely pollution to the whole watershed. Non-point source contributed more Nitrogen and Phosphorus to the watershed in flood season than that in non-flood season, while industrial wastewater contributed more nutrient to the watershed in non-flood season than that in flood season. Therefore, relevant departments should consider the seasonal differences and characteristics of regional pollution when formulating water environmental protection and governance countermeasures.The research results can provide a scientific basis and foundation for the water environment management and control in the Qinhuai River Basin.

Phosphorus forms and bioavailability in the surface sediments of Huayang Lakes were studied by SMT method in this article.The results showed that the total phosphorus (TP) content ranged from 431-1 099 mg/kg, and the descending order of TP content was Longgan Lake> Huangda Lake> Po Lake. Inorganic phosphorus (IP) accounted for about 36.3-78.8% of TP, and organic phosphorus (OP) accounted for about 18.9-40% of TP. IP was the main form of phosphorus. The descending order of different phosphorous forms in IP was: Fe/Al-P>Ca-P>Ex-P. The clay had a very significant positive correlation with TP, IP, Fe/Al-P, and there was also a linear relationship between the particle size and TP content. By comparing sampling points with and without submerged plants, it was found that submerged plants reduced the content of various phosphorus forms in the sediments except Ex-P. The bioavailable phosphorus (BAP) content in the Huayang Lakes was relatively high compared with other shallow lakes, which ranged from 183.2-598 mg/kg, accounting for 47.4% of the sediment TP , and the descending order of BAP content was Longgan Lake>Huangda Lake> Po Lake, consistent with the TP content, the BAP content was positively correlated with PO43--P in water. Based on the occurrence characteristics of phosphorus forms in the sediments, the study analyzed the bioavailability of phosphorus, hoping to provide references for solving the causes and effects of TP concentration fluctuations in Huayang Lakes.

This study took the Poyang Lake Region as the research area and the shallow groundwater was selected as the research object. The distribution characteristics and temporal and spatial variation of nitrate in shallow groundwater in the Poyang Lake Region were studied and source of nitrate in groundwater was analyzed. Nitrate concentration in shallow groundwater was between 0.5-21.6 mg/L with an average of 7.0 mg/L. In the wet and dry seasons,nitrate concentration was 0.7-21.6 mg/L and 0.5-15.7 mg/L, respectively. Groundwater with high concentration of nitrate was mainly found in the typical agricultural irrigation area. The hydrogen and oxygen isotopic characteristics of water samples showed that surface water was mainly from meteoric precipitation, and influenced by other recharge sources and evaporation. Shallow groundwater was mainly recharged by local meteoric precipitation and was mixed with surface water, less affected by evaporation. The results of nitrogen and oxygen isotopic composition of nitrate showed rainfall, irrigation activities, land use type and fertilizer application were major factors affecting the concentration and distribution of nitrate in shallow groundwater in the study area. The calculation results using Bayesian model showed that soil nitrogen had the maximum contribution rate to nitrate in groundwater, with an average contribution rate of 44.6%. Atmospheric precipitation had a secondary contribution rateto nitrate in groundwater with an average contribution rate of 28.2%. The contribution rates of nitrogen fertilizer, sewage and feces were 19.4% and 7.8%, respectively.

Wetland eco-compensation is an important policy tool to solve the problems of wetland ecological environment and effectively alleviate the contradiction between wetland protection and development and utilization, but the eco-compensation policy with the government as the main body often ignores and weakens the rights and interests of farmers. This paper theoretically analyzes the impact of eco-compensation on the willingness and behavior of farmers to protect wetlands, and reveals that the eco-compensation policy can influence the behavioral willingness of the group to form the herd effect, so as to make more farmers participate in the transformation of wetland protection. Taking Poyang lake wetland as an example, this paper introduces the eco-compensation policy, adopts the extended planning behavior theory and structural equation model, and makes an empirical analysis on the impact of eco-compensation policy and psychological factors on farmers’ wetland protection intentions and behaviors. Results showed that: （1） the eco-compensation policy can not only effectively motivate farmers directly participate in the wetland protection, can also through the positive influence on wetland protection will indirectly encourage farmers to participate in the wetland protection, but compared with effects on the wetland protection will significant under 1% level, eco-compensation policies directly affect the effect of wetland protection action only by under 5%, that eco-compensation policies for wetland protection behavior of incentive effect has not been fully play, there is further room for improvement. （2） the psychological variables of local farmers (behavior attitude, subjective norms, perceived behavior control) have a significant positive impact on the wetland protection intention of farmers, and indirectly affect the wetland protection behavior of farmers by influencing the wetland protection intention. （3） the direct effect of farmers' willingness to protect wetlands on their protection behavior is 0.640, and ecological compensation policies, psychological variables and other factors will indirectly affect wetland protection behavior through their willingness to protect wetlands, which fully demonstrates the importance of their willingness to protect wetlands on their protection behavior. Based on the results of the study, policy suggestions were put forward to improve farmers’ willingness and behavior of wetland protection from the perspective of adjusting wetland eco-compensation policy and strengthening farmers' psychological variables.

This paper aims to explore the impact of land consolidation on farmers’ cultivated land transfer based on the investigation of households in typical lobster and rice co-cropping area, Regression Discontinuity model was employed, and the affecting mechanism was tested. The results show that:（1）The implementation of land consolidation promotes the centralized operation of cultivated land. Land consolidation increases the probability of farmers transferring-in cultivated land by 16.0%~21.0%, but it does not have significant influence on farmers' transferring-out of cultivated land. Land consolidation increases the transferred-in cultivated land by 0.217 -0.314 hm², and the transferred-out area by 0.067 hm2-0.122 hm².（2）The implementation of land consolidation has effectively improved the quality conditions of cultivated land. Improvements of farmland flatness, accessibility to farmland roads, and irrigation and drainage infrastructure in the consolidation area have positively affected farmers' farmland transfer-out behavior, and the optimization of irrigation and drainage infrastructure has promoted the increase of farmland transfer area, while the improvement of farmland fragmentation has not effectively promoted the farmland transfer.（3）The improvement of cultivated land quality promotes the increase of cultivated land operation income and transfer price. The rise of cultivated land transfer price positively affected the probability and area of transfer-out farmland, and the rise of cultivated land operation income promotes the increase of the area of transfer-in farmland. Finally, suggestions are proposed based on this study. Firstly, we should intensify land consolidation in a targeted way to achieve the cultivated land value enhancement and increase the cultivated land operation income, and then improve the enthusiasm of farmers to transfer cultivated land. Secondly, we should accelerate the cultivation of new agricultural operators, encourage farmers to carry out appropriate scale management of cultivated land, and expand the demand for farmland transfer market. Thirdly, we should standardize the transfer behavior of cultivated land, and optimize the regulation of market price, to stabilize the supply of the transfer land.

Based on the survey data of 1195 farmers in the Loess Plateau, the analysis framework of social interaction-trust-soil conservation technology was constructed. The exploration factor, binary logistic regression and KHB method were used to analyze and test the role and influence of social interaction on farmers' adoption of soil and water conservation technology. mechanism. The study found that: (1)The five dimensions of social interaction directly affect farmers' adoption of soil and water conservation technologies, and play an important role in improving the adoption rate of agricultural technology and improving the ecological environment; (2)Social interaction indirectly affects farmers through interpersonal trust, network trust and government trust. The use of soil and water conservation technology; (3)The total indirect effect of trust (0.735 3) is greater than the direct effect of social interaction (0.576 3), in which the interpersonal trust has the largest indirect effect value (0.394 7), the government trust second (0.220 3), the network trust is minimal (0.120 3). The study deepened the understanding of the relationship between farmers and the adoption of soil and water conservation technology, and suggested that the relevant departments should give full play to the positive role of social interaction and trust when formulating targeted policies in economic and social development and ecological security.

Watershed protection legislation is the theoretical basis and practical path to realize the spatial rule of law in China's watershed. The Yangtze River Protection Law is the first attempt of comprehensive legislation for large-scale watershed protection in China. Taking the Yangtze River Protection Law as the object of analysis, using the order thinking and standard analysis methods related to laws and norms,through the design of legislative objectives, adjustment objects, legal principles and other legal norms, national strategic and political dimensions of the abstract value can be converted to the value of the law expression and function orientation. The three functional chapters of “resource protection”,“Water pollution prevention and control”,“ecological environment restoration”and the chapter of “green development” constitute the “3+1” structure mode. The integration of legislative value and green development idea makes it possible to establish network link between various functions. The Yangtze River Protection Law is based on the natural, ecological, economic, legal, strategic needs of the river basin and the general application of legal theories. Highlight focus in fundamental problems, legal value and function orientation in the whole law of polymerized and layout, it can provide the reference to large watershed protection legislation in China. The implementation of the Yangtze River Protection Law is the premise to realize the legislative value and function orientation, it is also to realize the unity of its supposed effectiveness and its actual effectiveness, it's a systematic, persistent process, need an administrative organ for law enforcement and judicial organs on the application of the law and the civil implementation of compliance with the law.

The fishing ban is an important institutional arrangement in the Yangtze River Protection Law, and an accurate understanding of its legislative logic and supporting system is the basis for the implementation of the system. The fishing ban system provided by Yangtze River Protection Law embodies the legalization and institutionalization of the Party and the state's Yangtze River protection policies, and contains the legislative concept of restoring the ecology of the Yangtze River and ensuring the sustainable availability of fishery resources. The system is composed of mutually coordinated space restriction, time restriction, method restriction and legal liability norms. It reflects the convergence and reinforcement of previous related regulations, but is not specific enough. The implementation of this system requires the support of a dual coordinated system and mechanism at the central and local levels, and also needs supporting systems including pollution prevention and ecological restoration system, fishery resource monitoring (investigation) and evaluation system, fishing permit system, fishing ban compensation system, and fish farming management control system, as well as the supporting legal norm systems constituted by related laws administrative regulations or rules, and local regulation or rules.

The conceptual system of water rights is a basic theoretical research topic in the field of resources and environment. Due to the complexity of water rights, the concept of water rights in China has not yet reached a consensus, and the theory and practice of water rights cannot meet the requirements of the era of joint protection. Under the background of the implementation of the joint protection strategy and the “Yangtze River Protection Law of the People′s Republic of China”, it is necessary to review and summarize the development process of the concept of water rights and its research results. Taking the “Yangtze River Protection Law of the People′s Republic of China” as the guide and adhering to ecological priority and green development, based on legal coordination and consistency, we should establish the value objectives, basic principles and legal attributes of the concept of water rights, unify the understanding of water rights, improve the conceptual system of water rights, and promote the coordinated development of ecological protection and resource utilization.