%0 Journal Article
%T Analysis of Jinghe watershed vegetation dynamics and evaluation of its relation to precipitation<br>泾河流域植被覆盖动态变化特征及其与降雨的关系
%A CHEN Cao-Cao
%A XIE Gao-Di
%A ZHEN Lin
%A GENG Yan-Hui
%A LENG Yun-Fa
%A <br>陈操操
%A 谢高地
%A 甄霖
%A 耿艳辉
%A 冷允法
%J 生态学报
%D 2008
%I 
%X Vegetation degradation is one of the key subjects in the study of global environmental changes, and the Normalized Difference Vegetation Index (NDVI) is generally recognized as a good indicator of terrestrial vegetation productivity and growth status. To evaluate the vegetation dynamic changes in the Jinghe watershed on Loess plateau from 1982 to 2003, major methods of change slope, principal component analysis and correlation analysis were employed with 8 km resolution NOAA-NDVI time series data. Based on these analyses, the relationship between precipitation and NDVI was discussed. Results show that there has been little change in both amplitude and variety of NDVI during the past 22 years. Vegetation in the upper stream areas, typically the watershed marginal mountain areas, changes significantly. A trend analysis shows that the similar finding on vegetation dynamics in different areas tends to be induced by climate changes and human land use transformation. A standardized principal component analysis indicates that the first two components, PC1 and PC2, are closely related to vegetation and climate changes, while PC3 and PC4 are connected with floodwater in flooding seasons, and PC5 and PC6 reflect the effects of human activities. Finally, the correlation analysis shows that there is a close positive relationship in this region between NDVI and precipitation. The rainfall sensitivity threshold reaches 550 mm or even higher.
%K vegetation dynamics
%K time series
%K correlation
%K human activity
%K precipitation<br>植被变化
%K 时间序列
%K 相关关系
%K 人类活动
%K 降雨
%K 泾河流域
%K 植被覆盖
%K 动态变化特征
%K 降雨
%K 关系
%K precipitation
%K relation
%K evaluation
%K dynamics
%K vegetation
%K watershed
%K 阈值
%K 相关性
%K 显示
%K 洪水
%K 汛期
%K 密切联系
%K 气候变化
%K 发现
%K 主成分分析
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=FE163E5DB2274E5937319DE98913EC37&aid=485B31445B78125BF27B8FA8E61C9E2D&yid=67289AFF6305E306&vid=D3E34374A0D77D7F&iid=38B194292C032A66&sid=052713E46A3A82E6&eid=4BE31F222F2202850DAEB16BF9874B83&journal_id=1000-0933&journal_name=生态学报&referenced_num=0&reference_num=42