Assessing ecohydrological factors variations and their relationships at different spatio-temporal scales in semiarid area,northwestern China |
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Authors: | Yonghua Zhu Sheng Zhang Pingping Luo Feng Su Biao Sun Li'e Liang Juan Guo Rui Yang |
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Affiliation: | 1. College of Civil Engineering and Architecture, Yan’an University, Yan’an 716000, China;2. Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot 001018, China;3. Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, Chang’an University, Xi''an, Shaanxi 710054, China;4. School of Water and Environment, Chang’an University, Xi''an, Shaanxi 710054, China;5. Northwest Engineering Corporation Limited, Power China, Xi''an, Shaanxi 710065, China |
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Abstract: | As a typical semiarid farming-pastoral ecotone sensitive to the environmennt, the Plain of West Liaohe Basin (WLBP) is currently experiencing drastic environmental changes. To identify how environmental change affect vegetation in the WLBP, we analysed spatiotemporal variation characteristics of Ecological environment factors based on monthly and annual air temperature (T), precipitation (P) and Normalized Difference Vegetation Index (NDVI) from 1982 to 2015. And the correlations between them were investigated by correlation analysis (Simple correlation, partial correlation and complex correlation) at temporal and spatial scale. The results showed that: (1) the vegetation growth of the WLBP showed ameliorated trend, with a change rate of 0.004/yr.; (2) P was more sensitive to NDVI than T; (3) and the influence of hydrothermal changes on vegetation growth was more significant than that of the change of single climate factors at time scales; (4) the effects of anthropogenic factors on vegetation change were 75.07% (1982–1993) and 98.08% (1994–2015), respectively. At the temp-special scales, P&T and land use type change (LUCC) were the main climatic and anthropogenic factors that affect vegetation changes, respectively. |
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Keywords: | Vegetation Hydrometeor Land use type change Main cause Semiarid area |
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