近几十年黄河源区气候与植被变化及相关分析

Changes and Relation Analyses of Climate and Vegetation in the Source Region of Yellow River in Recent Several Decade Years

通过对黄河源区气温、降水量、NDVI指数变化以及NDVI指数与气温、降水量的相关性进行分析,结果表明:黄河源区气温近50年呈升高趋势;源区近34年年降水量呈减少趋势,20世纪80年代源区降水量较多,比较湿润。近20年黄河源区及源区东北部植被覆盖较差,且不容易保持,达日及源区东南部植被覆盖相对较好,且容易保持;源区植被覆盖与气温、降水量均呈正相关关系,降水量对植被覆盖的影响比气温的影响大。

Analyzing the variations and correlations of temperature,precipitation and NDVI index in the source region of Yellow River.Some results are found,the temperature was ascend significance in the recent 50 years;the precipitation trend was descend in the recent 34 years,the precipitation was more in 1980＇s,it was much humid in source region of Yellow River;the vegetation was covered badly in the source region of Yellow River and its notheast,it was not easily keeping;but it was covered well in Dari and the southeast of the source region of Yellow River and it was easily keeping in the recent 20 years,the vegetation was positive correlated to temperature and precipitation and the precipitation took more effect on vegetation than temperature.