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雷州半岛是中国东部沿海农业旱灾最为严重地区之一。通过分析积分湿度指数I值变化,探讨雷州半岛农作物水分供需关系及其对农业旱灾的影响。结果表明:农作物水分供应不足是雷州半岛农业旱灾最主要原因。从时间上看,1962～2007年46a间,有31a的I值小于0.6,中旱和重旱频率高达67.4%。I值也有明显的季节差异,冬旱最为严重,46a中有44a为重旱,出现频率为95.65%。从空间上看,南部和北部农业旱灾尤为严重。徐闻和湛江中等以上农业旱灾频率达71%以上,廉江、雷州和吴川为66%左右,遂溪最低,也达57%。
Leizhou Peninsula is one of the most serious agricultural droughts along the eastern coast of China. By analyzing the change of integral humidity index I, we discuss the supply and demand of crop moisture in Leizhou Peninsula and its impact on agricultural drought. The results showed that: the shortage of crop water supply is the main reason of agricultural droughts in Leizhou Peninsula. From the time point of view, between 1962 and 2007 46a, the I value of 31a was less than 0.6, and the frequency of drought and drought was as high as 67.4%. I value also has a significant seasonal difference, the most severe winter drought, 46a in 44a is a severe drought, the frequency of 95.65%. Spatially, agricultural droughts in southern and northern regions are particularly severe. Xuwen and Zhanjiang moderate drought above the frequency of more than 71%, Lianjiang, Leizhou and Wuchuan is about 66%, Suixi minimum, also reached 57%.