摘要
本文利用Mann-Kendall非参数检验方法对川西北若尔盖高原1998~2008年10年逐旬共372景的SPOT-VEGITATION归一化植被指数(NDVI)进行变化趋势检验。结果表明:川西北若尔盖高原1998~2008十年来的NDVI变化趋势以衰减为主导,其中衰减区域的面积比例为47.8%,而增长区域的面积比例仅为22.0%。若尔盖高原植被衰减区主要分布在海拔3500~4000米的高程带上,气候变化和人类活动是导致NDVI变化的主要因素。
Based on 372 images of spot /vegetation from 1998 to 2008 of Ruoergai Plateau,the Mann-Kendall nonparametric trend test method was used to analyze the normalized difference vegetation index( NDVI) trends of Ruoergai Plateau. The research shows that during the 10 years,decreasing NDVI trend dominated Ruoergai Plateau. The declining area was 47. 8% while the increasing area was only 22%. The vegetation declining areas distributed on the DEM of 3500 ~ 4000m. Climate change and human activity were the main causes of NDVI variation.
出处
《四川环境》
2013年第S1期55-59,共5页
Sichuan Environment
