1982-2010年松花江流域植被动态变化及其与气候因子的相关分析

Dynamic Change of Vegetation Coverage in the Songhua River Basin and ItsCorrelation Analysis with Climatic Factor from 1982 to 2010

利用1982-2010年GIMMS和MODIS两种遥感数据集的归一化植被指数(NDVI)数据,分析了松花江流域植被NDVI时空特征及其与气候因子的关系。结果表明,松花江流域植被覆盖存在着显著的空间差异,山区NDVI值明显高于中部平原区。过去29a间,松花江流域植被NDVI稳定性较强,总体上变化趋势不明显,但有明显的阶段性:1982-1990年植被NDVI持续增加;1991-1997年相对稳定,1997-2003年呈波动降低趋势,2003-2010年缓慢上升。基于像元的相关分析表明,松花江流域NDVI与气温和降水量间均具有很强的相关性(P<0.01),而且植被NDVI变化受气温影响程度强于降水,针叶林是松花江流域受气温影响最大的植被类型。

Based on the remote sensing data,GIMMS-NDVI and MODIS-NDVI datasets during 1982-2010,technology of GIS spatial analysis and statistical processing,the spatial-temporal changes of vegetation coverage in Songhua river basin and its vegetation response for climate change were analyzed.The results showed that there were significant spatial differences of Songhua river basin vegetation;NDVI of mountain was significantly higher than that of the central plain.In the past 29 years,Songhua river basin vegetation NDVI was relatively stable,the change was not obvious,but it had obvious stages： vegetation cover kept increasing from 1982 to 1990;minor fluctuations of vegetation was relatively stable from 1991 to 1997;major fluctuations of vegetation dropped from 1997 to 2003;NDVI increased slowly from 2003 to 2010.Based on the relative analysis of pixel,it showed that Songhua river basin NDVI was highly correlated with temperature and precipitation（P〈0.01）,the change of vegetation affected by temperature was stronger than that affected by precipitation.Coniferous forest got the most impact which caused by the temperature in Songhua river basin.