Changes in vegetation and landscape patterns with altered river water-flow in arid West China |
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| Authors: | W Kong OJ Sun W Xu Y Chen |
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| Institution: | 1. State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China;2. Key Laboratory for Silviculture and Conservation of Ministry of Education, College of Forest Science, Beijing Forestry University, Beijing 100083, China;3. Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;4. Graduate University of Chinese Academy of Sciences, Beijing 100049, China;1. Institute of Landscape Hydrology, Leibniz Centre for Agricultural Landscape Research (ZALF), Eberswalder Straße 84, D-15374 Müncheberg, Germany;2. Institute of Geological Sciences, Workgroup Hydrogeology, Freie Universität Berlin, Malteserstr. 74-100, D-12249 Berlin, Germany;3. Institute for Earth and Environmental Sciences, University of Potsdam, Karl-Liebknecht-Str. 24-25, D-14476 Potsdam, Germany;1. Graduate School of Environmental Science, Hokkaido University, Sapporo, 060-0810, Japan;2. Faculty of Biology, Gadjah Mada University, Sleman DI, Yogyakarta, 55281, Indonesia;1. Linze Inland River Basin Research Station, Key Laboratory of Ecohydrology of Inland River Basin, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000, China;2. Pratacultural College, Gansu Agricultural University, Lanzhou, 730000, China;1. Department of Petrology and Geochemistry, Complutense University, Jose Antonio Novais st 2, 28040, Madrid, Spain;2. Geosciences Institute IGEO-CSIC, Jose Antonio Novais st. 2, 28040, Madrid, Spain |
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| Abstract: | Landsat TM images of Tarim Basin in western China for 1986, 1999 and 2004 were analyzed for quantifying the patterns of landscape change relating to changes in water supply. Results showed that vegetation area and NDVI mostly decreased from 1986 to 1999, and increased from 1999 to 2004, while changes in desert area displayed an inverse pattern. Saline alkali soil showed a tendency of increase from 1999 to 2004. Spatially, percentage of vegetation area decreased and percentage of desert area increased with distance from the river in the upper section, while such patterns were not observed for both the middle and the lower sections. Landscape displayed a pattern of fragmentation from 1986 to 1999 and integration from 1999 to 2004. Shape of vegetation patches tended to become more regular from 1986 to 1999 and more irregular from 1999 to 2004. Our results indicated hydrological control of spatio-temporal variations of vegetation and landscape pattern in arid regions. Water diversion can be effective for raising the local groundwater level and improving plant growth, but its effect is largely restricted to areas adjacent to the water pathway. |
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