松嫩平原西部植被覆盖动态变化研究

基于SPOT-VEGETATION NDVI资料,利用MVC和一元线性回归趋势模型等定量分析了我国松嫩平原西部半干旱区植被变化的时空特征.结果表明:1998—2006年研究区年归一化植被指数(NDVI)最大值从0.41下降到0.39,年平均NDVI减少了0.015;春季植被活动变弱,植被退化面积占区域总面积的57.33%,虽然在部分地区有所改善,但植被覆盖仍存在退化的趋势.

Analysis of vegetation change in west Songnen plain since 1998

Vegetation mediates the exchange of water and energy between the land surface and the atmosphere,thereby affects climate.The temporal evolution of decadal NDVI composition is regarded as an effective time window able to show the natural seasonal variations.A time series of SPOT-VEGETATION Normalized Difference Vegetation Index(NDVI) data are used to detect the vegetation cover change in west Songnen plain,Northeast China during the period of 1998 to 2006.Results shows that the yearly maximum NDVI mean over the study area decreased from 0.41 in 1998 to 0.39 in 2006,and the annual average NDVI value in whole area dropped by 0.015,which indicated the decreasing trend of vegetation activity.The degraded regions occupied 57.33% of the study area.There are some regions where vegetation cover is increasing,while the increasing amplitude is smaller than the decreasing amplitude in the main.