摘要
利用广东省6个站点47 a的日雨量资料,计算并分析了各站降雨侵蚀力的时间分布规律。结果表明,根据降雨侵蚀力峰值在年内出现的次数,可以分为单峰型和双峰型。降雨侵蚀力的年内分布非常集中,连续3个月的降雨侵蚀力平均占全年侵蚀力的一半以上,越靠近沿海的站点侵蚀力的集中度越高。降雨量与降雨侵蚀力集中度的分布规律一致,但与降雨量相比,降雨侵蚀力的分布更加集中。各站降雨量与降雨侵蚀力的倾向率均大于零,说明自1954年以来,雨量和降雨侵蚀力均有不同程度的增加趋势,降雨侵蚀力的增幅远远大于降雨量的增幅。但降雨侵蚀力倾向率的年内分布却是正负皆有。
By using the daily rainfall data from 6 main weather stations of Guangdong Province during the period of 1954 -2000, temporal distribution regularities of rainfall erosivity in every station are calculated and analyzed. The results indicate that： the temporal distribution of rainfall erosivity in all stations can be induced as one-peak type and two-peak type according to the times that the peak values arise in a year. The seasonal distribution of precipitation is analogical with that of rainfall erosivity on concentration extent, but distribution of rainfall erosivity is more concentrative, the rainfall erosivity of continuous three months accounts for over half of that in a year on average, and the nearer the stations are to the sea, the more concentrative the distribution of rainfall erosivity is. The rainfall erosivity is mainly distributed in the period from April to June for the stations of Guangzhou, Shaoguan and Heyuan, and from June to August for other three coastal stations, namely Shantou, Shanwei and Yangjiang. The tendency of precipitation and rainfall erosivity is all positive in the 6 stations, that shows that they have been increasing since 1954, and the increasing extent of rainfall erosivity is greater than that of precipitation. However, the tendency of rainfall erosivity in some months increases and in others decreases in a year; the maximal amplitude separately occurs in March in Shaoguan, April in Guangzhou, August in Heyuan, Shantou and Shanwei, July in Yangjiang.
出处
《热带地理》
2007年第2期102-106,共5页
Tropical Geography
基金
广东省自然科学基金博士科研启动项目(编号:5301109)
广东省科学院人才基金(编号:200602)
关键词
降雨侵蚀力
日雨量
时间分布
土壤侵蚀
Rainfall erosivity
Daily rainfall
Temporal distribution regularity
Soil erosion
