长江流域资源与环境 >> 2016, Vol. 25 >> Issue (07): 1142-1149.doi: 10.11870/cjlyzyyhj201607017
李军, 王兆礼, 黄泽勤, 钟睿达, 卓圣峰, 陈希贤
LI Jun, WANG Zhao-li, HUANG Ze-qin, ZHONG Rui-da, ZHUO Sheng-feng, CHEN Xi-xian
摘要: 干旱已成为西南农业区的具有一定破坏力的自然灾害,研究干旱的时空变化对该区干旱的评估、预测具有重要的现实意义。根据西南农业区1962~2012年月气象资料,利用Penman-Monteith公式计算蒸散发和标准化降水蒸散指数(SPEI)值;采用线性回归、Mann-Kendall方法、小波分析和旋转经验正交函数(REOF)等方法分析了西南农业区干旱时空变化。研究结果表明:(1)西南农业区整体呈干旱化趋势;2000年以来年、四季变干趋势更加明显;秋季变干趋势显著;年均SPEI指数不存在显著突变点;年和四季干湿变化均存在2~8 a左右的振荡周期。(2)根据REOF分解的前6个空间模态,将西南农业区划分成6个干湿特征区域:云南高原东部区、汉中盆地区、东部山地区、云南高原西部区、四川盆地区、贵州高原区;其中云南高原东部区变干趋势显著,汉中盆地区和东部山地区有变湿润趋势,但并不明显;6个分区干湿变化普遍存在2~6 a左右的振荡周期。研究结果可为西南农业区防旱、抗旱提供科学参考。
中图分类号:
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