近30a内蒙古NDVI演变特征及其对气候的响应

Change Characteristic of NDVI and Its Response to Climate Change in Inner Mongolia over the Past 30 Years

以1982~2012年GIMMS NDVI 3g数据和同时期气象数据为数据源,借助于最大值合成法、趋势分析和相关性分析等方法,分析了近30a内蒙古NDVI的变化趋势及其对气候因子的响应机制。结果表明:近30a内蒙古NDVI在时空分布上整体呈增加趋势,仅在呼伦贝尔西南部、锡林郭勒盟西北部及乌兰浩特中部少部分区域NDVI呈减少趋势;内蒙古对全球气候变化响应显著,年均气温和年均降水量均呈增加趋势,年均气温变化率为0.2℃/10a,年均降水量变化率为-10.7mm/10a;NDVI与气温、降水的相关关系具有明显的空间差异性,17.6%的区域与降水量显著相关,仅有0.4%的区域与气温显著相关,且降水对NDVI的影响超过了气温对NDVI的影响。

based on the third generation GIMMS NDVI time-series datasets and meteorological datasets during 1982~2012,the change characteristic of NDVI and its response to climate change in Inner Mongolia in recent 30 years were analyzed by means of maximum value composite,trend analysis and correlation analysis.The results show that the overall trend of NDVI spatial and temporal distribution in Inner Mongolia shows an increasing tendency,and the change trend of NDVI shows a decreasing tendency only in areas which are the southwest of Hulun Buir,the northwest of XilinguoleMeng and the central of Ulanhot.Inner Mongolia responses significantly to global climate change.The change of average annual temperature and precipitation shows an increasing tendency,and the change rate of them are 0.2℃/10 a,-10.7 mm/10 a,respectively.The correlation coefficients between NDVI and air temperature and precipitation shows spatial difference,and 17.6% areas are significantly related to precipitation,and only 0.4% of the areas are significantly related to air temperature.In addition,precipitation has more significantly effect on NDVI compared with air temperature.