Detecting and attributing vegetation changes on China's Loess Plateau
Detecting and attributing vegetation changes on China's Loess Plateau
复制标题
DOI：
10.1016/j.agrformet.2017.08.005
复制
发表时间：
2017-12-15
影响因子：
6.2
通讯作者：
Li, Zhi
中科院分区：
文献类型：
--
作者：
Li, Jingjing;Peng, Shouzhang;Li, Zhi
植被变化的归因可以为环境资源管理提供基础信息，特别是对于那些生态系统脆弱的地区。1999年实施的退耕还林（绿色）工程使黄土高原的植被发生了很大的变化，但对其影响的定量研究却很少。利用植被指数（NDVI）分析了1982-2015年植被覆盖度的时间变化，引入地形因子解释植被的空间格局，量化了人类活动对植被变化的贡献。东南部地区呈现植被绿化趋势，2000-2015年的绿化率大于1982-1999年。总体空间格局变化不大，但低值NDVI向高海拔移动，高值NDVI向低海拔移动，大部分类型的NDVI向较小的坡度移动。气候变化和人类活动对植被变化都有贡献，其中人类活动对整个研究区2000-2015年植被变化的贡献率为55%。
Attributing vegetation changes can provide fundamental information for environmental resources management, especially for those regions with vulnerable ecosystems. The vegetation on China's Loess Plateau has been reported to be greatly changed especially due to the Grain for Green Program launched in 1999; however, its attribution has rarely been quantitatively investigated. This study analyzed the temporal changes in vegetation coverage in terms of Normal Difference Vegetation Index (NDVI) over 1982-2015, introduced topographical factors to interpret the spatial patterns of vegetation, and quantified the contributions of human activities to vegetation changes. Vegetation greening trend exhibits in the southeast part, and the greening rates over 2000-2015 are greater than those for 1982-1999. The overall spatial pattern does not change much; however, the low-value NDVI is moving to higher elevations while the high-value NDVI to lower elevations, and most types of NDVI to smaller slopes. Climate variability and human activities both contribute to vegetation change, among which human activities account for 55% of vegetation changes over 2000-2015 for the whole study area.