郭昆明,邱天,宗乐丽,鲁晖,颉耀文

• 1:兰州大学资源环境学院

摘要(Abstract)：

针对不同地区植被变化对气温和降水的响应不一致的现象,该研究基于MODIS-NDVI遥感影像及同期33个气象站点数据,采用斜率分析和相关分析等方法,探究了河西地区2000—2017年生长季植被覆盖的年际和年内变化及其与气候因子的关系。结果表明:河西地区生长季NDVI的总体水平偏低,空间上由东南向西北逐步递减;近18年,河西地区NDVI的趋势变化为整体增加,增加速率为0.022/(10 a)。年尺度上,河西地区NDVI变化与气温相关性较小,主要受降水影响,86.80%的区域与降水呈正相关。月尺度上,植被覆盖随温度升高而逐渐增加,20℃时趋于最大;月降水量在0～60 mm之间时,NDVI随降水量增大而快速增加;超过60 mm后,则稳定在0.16左右。河西地区植被对降水的响应存在2个月滞后性,而与气温则无明显时滞性。

关键词(KeyWords)： MODIS-NDVI;河西地区;植被覆盖;气候因子

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(41471163,41530752);; 科技基础资源调查专项(2017FY101003);; 中央高校基本科研业务费专项资金项目(lzujbky-2017-it105)

作者(Author): 郭昆明,邱天,宗乐丽,鲁晖,颉耀文

DOI: 10.16251/j.cnki.1009-2307.2021.04.013

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