摘要
基于2002—2012年MODIS NDVI数据产品,分析了泛河西地区植被覆盖的变化状况,并结合2002—2012年该研究区22个气象站点的降水和气温资料,分别从年际、年内与季节变化3个层面综合分析了泛河西地区植被覆盖对气候变化的响应。结果表明,泛河西地区植被覆盖呈增加趋势和减小趋势的面积分别占研究区总面积的71.07%和28.93%,呈增加趋势的面积明显大于呈减小趋势的面积;从年际变化来看,研究区植被变化受降水影响的程度高于气温;从季节变化的空间分布来看,3个季节中NDVI与降水之间呈正相关关系的面积大于其与温度之间呈正相关关系的面积,即与温度相比,泛河西地区植被的变化趋势对降水的响应较为敏感。
In this paper, the change of vegetation in Pan-Hexi Region were extracted using MODIS NDVI data from 2002 to 2012, and its response to climate change was analyzed, combined with precipitation and temperature data, which were acquired from 22 meteorological stations. The results showed that： increasing area of NDVI accounted for 71.07% of all area, and decreasing area accounted for 28.93%; area of vegetation coverage tended to be better was significantly larger than that tended to be deteriorated in the region in recent 11 years. Inter-annual vegetation change was greatly affected by precipitation than by temperature, the coefficient of correlation between NDVI and precipitation in three seasons were greater than that between NDVI and temperature. That is to say, vegetation change in Pan-Hexi Region is more sensitive to precipitation than to temperature.
出处
《中国农学通报》
CSCD
2014年第34期101-106,共6页
Chinese Agricultural Science Bulletin
基金
国家科技支撑项目"敦煌生态修复关键技术研究与示范"(2012BAC08B07)
中国博士后科学基金项目"内陆河流域水文循环要素的遥感反演与尺度效应分析"(2011M501496)
陕西师范大学中央高校基本科研业务费专项资金项目"干旱地区水文生态研究"(GK201101002)
关键词
泛河西地区
降水
NDVI
气候变化
气温
Pan-Hexi Region
precipitation
NDVI
climate change
temperature
