基于MODIS的贵州省黎平县植被变化

MODIS-Based vegetation change in Liping County of Guizhou

利用2000-2014年期间的MODIS-NDVI数据和气温、降水资料,分析黎平县植被覆盖变化及其影响因素。研究结果表明:(1)从空间变化来看,近15年间黎平县植被退化面积仅占研究区总面积的14%,改善的区域占75%;基本不变的区域约占11%。植被退化区主要分布在东北部和中部地区。(2)年均NDVI值随海拔高度上升在增加;年均NDVI最大值出现在1 200 m以上的区域;年均NDVI最小的区域为200m以下的区域。(3)研究期间年均NDVI值与年降水量、年均温的变化趋势呈负相关关系,气温的影响较显著。

Based on the MODIS - NDVI data and temperature and precipitation data during the past 2000 -2014 years, the vege-tation cover change and its influencing factors in Liping county were analyzed. Results showed that ： 1 ） from the change of space, the vegetation degradation area of Liping county only accounts for 14% of the study area in the past 15 years, the improvement area ac-counts for 75% , and the no change area is about 11%. The degraded areas are mainly distributed in the northeast and central re-gions .2） The annual NDVI value increases with the elevation. The maximum annual NDVI value appears in the region above 1200 m and the minimum annual NDVI area is below 200 m. During the study period, the average annual NDVI value was negatively correla-ted with annual precipitation and annual mean temperature, and the effect of temperature was significant.