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运用改进的 Mann-Kendall (MMK) 趋势检验以及反距离加权空间插值 (IDW) 等方法, 系统分析了广西1961-2008年的月降水量变化趋势,深入探讨了广西降水量时空特征的变化。研究结果表明: ①桂南、桂东北和桂西南的年降水量均呈增加趋势, 桂北、桂西和桂中地区年降水量呈减小趋势,增加和减小趋势变化不显著。②桂东北和桂西北地区在湿季和干季降水量均呈增加趋势, 桂中和桂东南地区变化则恰好相反; 桂东北和桂西部分地区降水量湿季呈增加趋势, 而干季降水量呈减小趋势。③桂西地区除冬季以外, 其他季节降水量均呈减小趋势; 桂中除秋季以外,其他季节降水量均呈增加趋势;而桂东、桂南和桂东北降水量在夏季和冬季呈增加趋势,在春季和秋季呈减小趋势,秋季降水量减小趋势变化显著。
The trend of monthly precipitation in Guangxi from 1961 to 2008 was systematically analyzed with the improved Mann-Kendall (MMK) trend test and inverse distance weighted spatial interpolation (IDW). The temporal and spatial characteristics of precipitation in Guangxi were also discussed. The results show that: ①The annual precipitation in Gui Nan, Gui Dongbei and Gui Nan Nan all showed an increasing trend, and the annual precipitation in Gui North, Gui Xi and Guizhong showed a decreasing trend, while the increasing and decreasing trend did not change significantly. ②The precipitation in wet and dry seasons increased in northeast Guangxi and northwestern Guiwu, but opposite in southwest Guangxi and western Guangxi; while in wetlands in northeastern Guangxi and western Guangxi, the wet season showed an increasing trend, while in dry seasons, The amount showed a decreasing trend. (3) Precipitation in other seasons except for winter in western Guangxi showed a decreasing trend. Precipitation in other seasons increased with the exception of autumn in GuiZhong, and increased in summer and winter in Guidong, GuiNan and northeast Guangxi The trend shows a decreasing trend in spring and autumn, and the decreasing trend of precipitation in autumn has a significant change.