生态政策驱动下的内蒙古自治区杭锦旗植被覆盖变化

Influence of ecological policy on changes in vegetation coverage in Hanggin Banner,Inner Mongolia,China

采用1991、2001和2011年的Landsat-TM卫星遥感影像数据,基于NDVI像元二分模型,对生态政策实施前(1991-2001年)与实施后(2001-2011年)杭锦旗的植被覆盖变化进行了对比分析,并结合研究区的气候变化和生态建设历程对影响植被覆盖变化的因素进行了探究。结果表明,生态政策实施后,杭锦旗的植被覆盖度显著提高,植被覆盖度的年际平均增长速度约为实施前的10倍;植被覆盖状况显著好转,年净好转面积占区域总面积的18.83%。生态政策是驱动2001-2011年间杭锦旗植被覆盖好转的主要因素,降水和气温等对植被覆盖变化的影响并不显著。

Vegetation coverage is an important indicator of regional ecological environmental change.Climate change and human activities are the factors affecting vegetation coverage change.Several ecological construction policies were implemented in Hangjin Banner after 2001.Based on the Dimidiate Pixel Model and Landsat5-TM remote sensing data(1991,2001,and 2011),a comparative analysis was conducted of the change in vegetation coverage from the period before the implementation of the ecological policy(1991 to 2001)and that post-implementation(2001 to 2011).The factors affecting vegetation coverage change were explored in conjunction with climate change and ecological construction processes in the study area.The results showed that after the implementation of the ecological policy,the vegetation coverage in the Hangjin Banner increased significantly,and the average annual growth rate of vegetation coverage was approximately 10 times that of the pre-implementation period.Vegetation coverage improved significantly,and the net improvement area accounted for 18.83%of the total area.Ecological policy was the main driving factor of the increase in vegetation coverage during the period 2001-2011.The influence of precipitation and temperature on vegetation coverage was not significant.