内蒙古四大沙地植被NDVI变化及气候响应研究

Research of Climate Response and NDVI Changes of Vegetation of Four Sandy in Inner Mongolia

为了更好掌握内蒙古四大沙地的植被长势变化及气候响应,用GIMSS/NDVI数据对1981 ～ 2001年8月的植被NDVI值进行了研究.分析结果表明,四大沙地的植被NDVI平均值从高到低的顺序为呼伦贝尔沙地、科尔沁沙地、浑善达克沙地、毛乌素沙地.NDVI变异系数从大到小的顺序为浑善达克沙地、毛乌素沙地、科尔沁沙地,呼伦贝尔沙地.对四大沙地的8月NDVI数据与5～8月累积平均气温逐月进行回归分析结果都不具有显著性.而8月的NDVI数据与5～8月累积降水量逐月回归分析结果表明,沙地植被对降水量有明显的滞后效应.浑善达克沙地和毛乌素沙地NDVI与累积降水量有正相关,呼伦贝尔沙地和科尔沁沙地NDVI与累积降水量不具有显著性.

In order to better master the major changes in vegetation growing and its climate effect in the four great sandy of Inner Mongolia,the change of its average values in August from 1981 to 2001 was studied by using GIMSS/NDVI data.The study showed that the average NDVI values for the sandy ranges from highest to lowest and they are Hulunbeier sandy land,Horqin sandy land,Hunshandake sandy land and MU WS sandy land.As for its variation coefficient range from largest to smallest they are Hunshandake,MU WS,Horqin and Hulunbeier.The regression analysis was conducted on August NDVI data and accumulative average temperature during May-August,the results have no significance.While regression analysis on August NDVI data and accumulative precipitation during May-August showed that sandy land vegetation has obvious legging effect on precipitation.Hunshandake sandy land and MU WS sandy land has positive correlation with accumulative precipitation,NDVI and accumulative precipitation of Hulunbeier sandy land,Horqin sandy land has no significance.