2000-2014年豫西山地植被NDVI时空变化特征分析

摘要

Based on MODIS-NDVI data and DEM data of study area during 2000-2014,with the aid of the MRT, ArcGIS software,using MVC method,average method and trend analysis method to study the vegetation NDVI spatial-temporal variation characteristics of Yuximountain. The research shows as follows. ①During 2000-2014,the vegetation NDVI of Yuxi mountain showed a trend of significant growth,and the growth rate is 0.021/10a(P<0.05). Moreover,the autumn(0.052/10a,P<0.05)is significantly higher than the spring(0.015/10a,P>0.05). It was showed that in the context of global warming,vegetation is improven in the study area,with the improving trend that the extension of growing season is stronger than growth season in advance.②Most of the Yuxi mountains vegetation NDVI is between 0.4 to 0.7,and the proportion reached 93.8%. As a whole,with Funiu mountain as the boundary, the northern average NDVI is higher than the south in the study area,conforming to the regularity of latitude zonal vegetation distribution.③In the past 15 years,the change trend of the Yuxi mountains vegetation NDVI has obvious space difference. The vegetation coverage at the lower elevation is generally increased ,while the vegetation coverage at the high altitude has a degradation trend.%基于2000—2014年MODIS-NDVI数据以及研究区DEM数据，借助MRT，ArcGIS等软件，采用MVC法、均值法获得月均、季均以及年均NDVI数据，并采用趋势分析法研究豫西山地植被NDVI时空变化特征.研究表明：①2000—2014年豫西山地植被NDVI呈显著增长趋势，增长率为0.021/10a（P<0.05），其中秋季（0.052/10a，P<0.05）明显高于春季（0.015/10a，P>0.05），表明在全球变暖的大背景下研究区植被覆盖处于改善状态，表现为生长季延长强于生长季提前的趋势.②豫西山地大部分地区植被NDVI都在0.4~0.7之间，所占比例达到93.8%.整体来看，以伏牛山为界，研究区南部NDVI平均值高于北部，符合植被分布的纬度地带性规律.③15年来豫西山地植被NDVI变化趋势具有明显的空间差异，海拔较低处植被覆盖普遍呈增加趋势，海拔较高处表现为退化趋势.