RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2016, Vol. 25 >> Issue (03): 445-452.doi: 10.11870/cjlyzyyhj201603011

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IMPACT OF LAND USE CHANGES ON SPATIAL-TEMPORAL PATTERN OF ECOLOGICAL WATER CONSUMPTION IN TAIHU LAKE BASIN IN RESENT 25 YEARS

LV Wen1,2, YANG Gui-shan1, WAN Rong-rong1   

  1. 1. Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;
    2. Suzhou Substation of Jiangsu Province Hydrology and Water Resources lnvestigation Bureau, Suzhou 215006, China
  • Received:2015-08-06 Revised:2015-11-20 Online:2016-03-20
  • Supported by:
    the state Key program of National Nature Science of China (Grant No. 41030745);The National Natural Science Foundation of China (Grant No. 41071354);中国科学院南京地理与湖泊研究所"一三五"重点布局项目(NIGLAS2012135005)

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Abstract: The effects of global land use/land cover changes (LUCC) on the ecosystem and environment have been widely concerned, e.g. IGBP/BAHC,MBP,MA has paid more and more attention to the effects of LUCC on ecosystem hydrological cycle. Ecological water consumption, an important part of surface water cycle, has been the hot spots in ecological hydrology. Taihu Lake Basin has endured a rapid land use and land cover changes with rapid development of socio-economic in recent 25 years, leading to degraded ecosystem function of water volume regulation, e.g. watershed flooding disasters occurred frequently. Aiming to provide an eco-hydrological management mode for the Taihu Lake Basin, the impact of land use and land cover changes on ecological water consumption in Taihu Lake Basin in recent 25 years was assessed by computing the water consumption elements at grid units by means of GIS platform. The basic surface parameters which were used for water balance calculation were obtained by Remote Sensing and field monitoring methods. The main conclusions were drawn as followed: (1)the spatial distribution of total annual ecological water consumption and its components (interception and evapotranspiration) were in good accordance with distribution of vegetation cover. The areas of higher water consumption corresponded to a higher degree of vegetation cover, which distributed in the southwest mountainous and hilly areas in west Zhejiang Province, the northern and western hills around Taihu Lake. The areas of the lower water consumption corresponded to the areas of the lower vegetation coverage, which distributed in Pudong and Puxi district in eastern Taihu Lake Basin; large, medium and small cities, villages and towns in Suzhou-Wuxi-Changzhou region. Interception and evapotranspiration with high value distributed mainly in the hills and mountains with the forest, i.e. west Zhejiang province, north and west areas around Taihu Lake.(2)From 1985 to 2000 and from 2000 to 2010 in Taihu Lake Basin, the areas of a significant reduction in ecological water consumption were significantly larger than those areas of increasing. Areas of a significant reduction in ecological water consumption were distributed mainly over Pudong and Puxi district, Suzhou-Wuxi-Changzhou district and Hangzhou-Jiaxing-Huzhou district. Areas of increasing ecological water consumption were sporadic distribution during 1985 to 2000, and were mainly distributed in hilly areas west Taihu Lake Basin in 2010. (3)The annual ecological water consumptions, in 1985, 2000, and 2010 were 1068.83 mm, 1041.47 mm and 960.19 mm, respectively. The entire basin water consumption reduced, and reduced amplitude (2.53%) between 1985 and 2000 was smaller than that between 2000 and 2010(7.78%), consisting with the degree of cultivated land decreasing.

Key words: ecological water consumption, land use change, spatial-temporal pattern, Taihu Lake Basin

CLC Number: 

  • X143
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