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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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1982—1999年珠江流域归一化植被指数与降水年际变化分析
Keywords: 珠江流域,ndvi,降水,年际变化
Abstract:
？利用1982—1999年月平均归一化植被指数(normalizeddifferencevegetationindex,ndvi)和降水资料,？采用经验正交函数(eof)方法分别研究了珠江流域的ndvi和降水在年和年际尺度上的异常关系,？并分析了ndvi与降水及其他一些气象因子的相关关系。研究发现流域ndvi和降水在年内异常上具有较好的空间一致性,？在时间上具有1—2个月的滞后;？年际尺度上两者异常空间差异明显,？流域东部(下游)异常为负相关,？西部(上游)异常为正相关。ndvi和各气候因子的相关关系存在明显的空间和季节差异:？流域东部ndvi和降水负相关明显,？和温度及太阳短波辐射正相关明显;？流域西部ndvi和降水滞后正相关明显,？和温度相关不明显;ndvi在夏季和降水呈显著负相关,？在春、秋季节滞后于降水,？呈明显正相关,？且滞后3个月正相关最为明显。
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