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%。
The agro-drought disaster takes place frequently and is very serious in Leizhou Peninsula. Inadequate water supply of crops is one of the most important factors. Integral humidity indexIis used to analyze crop water supply. The results reveal the agro-drought regulations of spatial and temporal distribution in the Peninsula. From 1962 to 2007, the frequency of agro-drought disasters over middle level (I< 0.6)reached 67.40% and they were particularly obvious in the northern and southern parts. The highest frequency was in Xuwen County, the lower in Zhanjiang City;it was as high as 95.65% in winter and causes very serious disaster from winter to spring.
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