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In order to investigate vegetation variation in the source region of southwest rivers as warming of climate system,based on the method of tendency analysis and correlation analysis,spatio-temporal variation of normal difference vegetation index and relationship between normal difference vegetation index and climatic factors were analyzed by using a long time series of the latest GIMMS NDVI and mean precipitation,temperature,potential evapotranspiration from 1982 to 2012.The results show that in the study area,inter annual variation of normal difference vegetation index was not significantly increased from 1982 to 2012.Spatial change trend of normal difference vegetation index has great difference and the area with increasing change trend accounts for 66.72% of the total area,while the decreasing area accounts for33.28%.At the watershed scale,vegetation cover and normal difference vegetation index change trend show clear spatial differentiation.Temperature was the dominant climatic factor affecting the variation of normal difference vegetation index,followed by precipitation,while potential evapotranspiration and sunshine duration had little impact.
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Basic Information:
DOI：10.20040/j.cnki.1000-7709.2018.02.004
China Classification Code:Q948
Citation Information:
[1]DING Rui,WANG Zhao-li,CHEN Xiao-hong.Spatio-temporal Variation of Normal Difference Vegetation Index and Its Relationship with Climatic Factors in Source Region of Southwest Rivers[J].Water Resources and Power,2018,36(02):15-19.DOI:10.20040/j.cnki.1000-7709.2018.02.004.
Fund Information:
国家自然科学基金项目(91547202,51579105); 国家科技支撑计划(2012BAC21B0103); 华南理工大学亚热带建筑科学国家重点实验室开放研究项目(2017ZB29)
2018-02-25
2018-02-25