摘要
在对1km分辨率的1993年NOAA/AVHRR、2000年和2006年MODISNDVI数据进行归一化处理的基础上,通过变化强度参量分析三江源地区NDVI的空间变化规律,结合源区内温度、降水、湖泊和湿地变化等调查资料,利用GIS空间分析技术综合研究三江源地区生态环境变化。结果表明:在1993—2000年和2000—2006年,三江源地区NDVI下降区域面积分别占源区总面积的50.73%和23.85%。三江源地区在20世纪90年代环境恶化严重,NDVI下降强烈,随着2000年8月三江源自然保护区的建立,该区环境治理取得良好效果,源区NDVI呈现稳定、轻微增加趋势,但局部地区仍存在NDVI下降趋势。综合分析温度、降水、湖泊、湿地和NDVI的变化状况表明,三江源环境变化存在显著区域特征。
On the basis of Normalized Difference Vegetation Index （NDVI） data with resolution of 1 km of NOAA/AVHRR in 1993 and NDVI data for MODIS in 2000 and 2006, the authors analyzed the NDVI spatial dynamic variations by changing intensive parameters in the source regions of the three rivers （ Yangtze River, Yellow River and Lancang River）. In combination with other data such as temperature, rainfall and changes of lake or wetland by using GIS spatial analysis methods, the authors studied the changes of ecological environment, which shows that in 1993--2000 and 2000--2006, the areas with decreasing NDVI accounted for 50. 73% and 23.85% of the total area respectively. There occurred environmental deterioration in the studied region with strongly decreasing NDVI in 1990 s. But along with establishing the nature reserve in August 2002, it has achieved better effect for the environment, and the NDVI shows a stable state with slight upward trend, but still has some downward trends in local places. Integrated analysis on changing factors including temperature, rainfall, lake, wetland and the change of NDVI, there exist prominently regional differences in the environmental changes in this region.
出处
《世界地质》
CAS
CSCD
2008年第4期427-431,448,共6页
World Geology
基金
中国地质调查局"青藏高原生态地质环境遥感调查与监测"(200315100002)
关键词
三江源
生态环境
NDVI
变化强度
source regions of the three rivers
ecological environment
Normalized Difference Vegetation In- dex
intensity of changes
