三江平原沼泽湿地归一化植被指数分布特征及其变化分析

Distribution and Change of Normalized Difference Vegetation Index of Marshes Wetland in the Sanjiang Plain

利用遥感数据和气象数据,分析了三江平原沼泽湿地2000年8月和2015年8月归一化植被指数的分布特征及其差异。研究结果表明,2000~2015年三江平原沼泽湿地丧失严重,面积减少了约2847 km^(2),面积减少率约为31%,沼泽湿地丧失的区域主要集中在三江平原的东北部;三江平原沼泽湿地8月归一化植被指数较大值分布在三江平原东部,而较小值分布在三江平原西北部;2015年8月三江平原大部分沼泽分布区域的水热条件优于多年平均状态,归一化植被指数比2000~2015年多年平均值更大。

Based on the remote sensing data and meteorological data, this study analyzed the distribution and difference of normalized difference vegetation index in marsh wetland of the Sanjiang Plain between August2000 and 2015. The results showed that the marsh wetland in the Sanjiang Plain was seriously lost. The area of marshes was reduced about 2847 km^(2)(about 31% of marsh area in 2000) from 2000 to 2015. The loss of marsh was mainly concentrated in northeast of the Sanjiang Plain. In August, the larger value of normalized difference vegetation index in marsh wetland of the Sanjiang Plain was distributed in east of the Sanjiang Plain, while the smaller value was distributed in northwest of the study region. The hydrothermal conditions in August 2015 were better than the long term(2000-2015) average conditions in most areas, and the normalized difference vegetation index in most areas of the Sanjiang Plain was larger than the long term average(2000-2015) normalized difference vegetation index in August.