近十年延边朝鲜族自治州植被变化特征分析

Analysis on the Vegetation Change in Yanbian Area in Last Decade

利用2000—2008年经过谐波分析等影像处理的250 m分辨率的MODIS/NDVI数据,采用多种统计方法,对延边朝鲜族自治州的植被按分区和植被类型进行了植被覆盖年内和年际变化特征研究.结果表明:1)延边州近十年植被覆盖处于增长趋势,其中秋季增长最快;2)延吉市与龙井市植被覆盖较好,图们市较差,安图县植被覆盖呈下降趋势;3)针叶林植被覆盖最佳,针阔混交林和阔叶林植被覆盖高于荒草地和沼泽地,但荒草地增长最快.

Based on the MODIS/NDVI 250 m resolution data from 2000 to 2008,regional map and vegetation map,we analyzed the intra-annual and inter-annual variation of vegetation cover in Yanbian Area by using the HANTS,imagery processing methods and statistical methods.Then further analyses were carried into different sub-regions and different vegetation types.The results showed that the vegetation variation trends are increased in last decade,and the increase is particularly obvious in autumn.Zonal statistics showed that the vegetation covers in Yanji City and Longjing City are much better than Tumen City and other sub-regions.Apart from Antu County,the other regions had an NDVI increase trend and the trend in Wangqing County is the fastest.The vegetation covers of coniferous forests are the best in all five vegetation types.The NDVI of grassland and marshes are less than that of the coniferous forests,mixed forests and broadleaf forests.All types of vegetation cover are increasing,and grassland has a faster speed.