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冰川冻土  2014 

1981-2006年西北干旱区NDVI时空分布变化对水热条件的响应

DOI: 10.7522/j.issn.1000-0240.2014.0040, PP. 327-334

Keywords: NDVI,植被覆盖率,相关分析,IDW插值

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Abstract:

气候是植被变化的重要驱动因子.利用1981-2006年GIMMS归一化植被指数(NDVI)时间序列数据,结合68个气象站降水、气温数据和DEM地形数据等资料,研究分析了西北干旱区植被活动的年、季变化和空间差异.结果显示在1981-2006年的26a,西北干旱区植被的覆盖率增加了4.5%,年平均NDVI增加了3.2%;植被的生长季延长,主要表现在生长季的推迟.从总体来说,植被覆盖率、生长季和NDVI值在2000年以前显著增加,而在2000年以后都呈现减小的趋势;其中,减少明显的区域是在伊犁河谷、中天山及平原区,在河流上游山区或源头以及部分河流两岸呈现增加态势;在年际变化上,大部分区域的气温、降水与NDVI相关性不强.而年平均气温在4.58℃以下低温区和年降水在180mm以上的相对湿润区,气温和降水都呈现正相关;在季节变化上,NDVI值在春季和秋季与温度相关显著,而夏季与降水相关性强.2000年以后,植被覆盖率和NDVI值开始出现降低趋势与气温持续升高、降水量增幅下降有关.

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