摘要
基于1982-2006年间的GIMMS NDVI和2001-2013年的MODIS NDVI数据对渭河流域30年来植被NDVI的年际变化和空间分布特征进行了分析,并结合研究区内的气象数据探讨了植被NDVI与气候因子的相互影响关系。研究显示,近32年间渭河流域植被NDVI整体呈上升趋势,且空间差异显著,主要表现为流域西北地区的黄土丘陵沟壑区及北部的黄土高原区NDVI较低,植被覆盖较差;流域南部的秦岭山区、关中平原区等地植被生长状况较好。流域气温和降水呈现缓慢增长趋势。植被NDVI与年均气温整体上表现为负相关,与年降水量间呈正相关。总体上,降水是渭河流域植被生长的主要影响因子。
Based on the GIMMS NDVI from 1982 to 2006and MODIS NDVI form 2001 to 2013,the annual dynamic and spatial variability of vegetation NDVI in Weihe river basin were studied.And combined the meteorological data the responses of vegetation NDVI to climate change was analyzed.The results showed that the vegetation NDVI in Weihe river basin as a whole had increased over the past 32 years,and had obvious spatial variability,the temperature and precipitation showed a trend of slowly growth in the basin.Vegetation NDVI and the annual average temperature show the negative correlation on the whole,and positively correlated with annual precipitation.On the whole,precipitation is the main influence factor for vegetation growth in weihe river basin.
出处
《北京测绘》
2016年第5期7-12,共6页
Beijing Surveying and Mapping
关键词
渭河流域
NDVI
气候变化
气温
降水
Weihe river
NDVI
climate change
temperature
precipitation
