基于遥感的晋北沙化区植被覆盖变化监测

Vegetation Dynamics in the Desertification Area of Northern Shanxi Province Based on the Remote Sensing Data

以山西省晋北沙化区为研究区,基于长时序的归一化植被指数(NDVI)数据和趋势分析方法,从年份、季节和月份3个尺度系统分析了研究区的植被变化时空特征。研究发现:2000—2012年晋北沙化区的植被活动在增强,年增加率为14.61%,研究区89.57%的区域植被活动在增强,其中秋季植被活动增强最为明显,表明近13 a晋北地区的土地沙化趋势在减弱,在该区实施的京津风沙源治理工程的生态效应正在呈现。但研究区整体植被覆盖仍较低,69.93%的区域为较少植被区。因此,京津风沙源治理工程在该区需继续实施,才能保证植被恢复到理想的状态。

In the desertification area of Northern Shanxi Province , we analyzed vegetation changes both temporally and spatially from multi-scales based on the long time-series normalized difference vegetation index （NDVI）.The vegetation activities from 2000 to 2012 showed an increasing trend as a whole with the increasing rate of 14.61%.Vegetation activity in 89.57%of the total study area increased over 13 years.The greatest increasing trend of vegetation activity occurred in the autumn .The desertification trend was decreasing in Northern Shanxi Province and the benefit of Beijing -Tianjin sandstorm control project was presenting .However , 69.93%of the total area is low vegetation coverage ,indicating that the ecological restoration pro -gram in this area should be continue to implement for restoring to the expected result .