摘要
根据福州市年降雨量数据资料,采用变异系数、趋势系数和气候趋势率等方法分析不同时间尺度的降雨和降雨侵蚀力的变化趋势。结果表明:(1)福州市年平均降雨侵蚀力和降雨量分别为393.06 MJ·mm·hm^-2·h^-1和1 394.43 mm。降雨侵蚀力和降雨总量年际波动显著,且年降雨量和降雨侵蚀力年内变化较大,主要集中在5、6、8、9月。(2)总体上夏季、秋季和冬季降雨侵蚀力的倾向率为正,分别为7.57、0.39和1.40 MJ·mm·hm^-2·h^-1·10 a^-1,春季降雨侵蚀力倾向率为负值,呈减少趋势。(3)月降雨量和降雨侵蚀力的变化趋势基本一致,1、2、4、7、8、10、11、12月降雨侵蚀力有增加的趋势,3、5、6、9月降雨侵蚀力有减少的趋势。(4)福州雨季的降雨量和降雨侵蚀力分别为990.61 mm和285.90MJ·mm·hm^-2·h^-1,并且其变异系数在全年中最小,均低于0.22;枯季的降雨量和降雨侵蚀力分别为403.82 mm和107.16MJ·mm·hm^-2·h^-1,变异系数在全年中最大,均高于0.40,且福州降雨量和降雨侵蚀力在雨季、枯季及其年际变化均属于中等变异性(0.1≤CV≤1)。研究结果可为福州市的土壤侵蚀评估、预报和水土流失防治提供数据和理论支撑。
The study focuses on the trend and correlation of rainfall and rainfall erosivity in Fuzhou on different time scales. Based on the precipitation data, the variation trends of rainfall and rainfall erosivity at different time scales were analyzed by using the methods of trend coefficient and climatic trend rate. The results show that:(1) The annual average rainfall erosivity and rainfall in Fuzhou are 393.06 MJ·mm·hm^-2·h^-1 and 1 394.43 mm, respectively. Rainfall erosivity and total rainfall fluctuate significantly between years. Annual rainfall and total rainfall erosivity change greatly during the year, and mainly concentrated in May, June, August and September.(2) Overall, in summer, the tendency rates of rainfall erosivity in autumn and winter are positive number, 7.57, 0.39 and 1.40 MJ·mm·hm^-2·h^-1·10 a^-1, respectively. In spring, the tendency rates of rainfall erosivity are negative number, which showing a decreasing trend.(3) The change trend of monthly rainfall and rainfall erosivity is basically the same. Rainfall erosivity increases in January, February, April, July, August, October, November and December, and decreases in March, May, June and September.(4)Rainfall and rainfall erosivity in Fuzhou rainy season are 990.61 mm and 285.90 MJ·mm·hm^-2·h^-1, respectively, and their variation coefficients are the smallest in the whole year, which are lower than 0.22. Rainfall and rainfall erosivity in dry season are 403.82 mm and 107.16 MJ·mm·hm^-2·h^-1, respectively. The coefficient of variation is the largest in the whole year, which is higher than 0.40, and the rainfall and rainfall erosivity in Fuzhou rainy season, dry season and interannual variation. All of them belong to medium variability(0.1<CV<1). The results of this study can provide data and theoretical support for the prevention and control of soil erosion and the study of soil erosion mechanism in Fuzhou City.
作者
孙丽丽
査轩
SUN Lili;ZHA Xuan(School of Geographical Sciences,Fujian Normal University,Fuzhou 350007,China;Institute of Geography,Fujian Normal University,Fuzhou 350007,China;Fujian Provincial Key Laboratory for Subtropical Resources and Environment,Fujian Normal University,Fuzhou 350007,China)
出处
《亚热带资源与环境学报》
2019年第3期38-43,共6页
Journal of Subtropical Resources and Environment
基金
国家重点研发计划项目“南方红壤低山丘陵区水土流失综合治理”(2017YFC05054)
福建师范大学地理科学学院研究生科研创新基金项目“严重侵蚀退化马尾松低效林地不同植被恢复措施调控效益研究”(QSX20170764)
关键词
降雨量
侵蚀性降雨量
降雨侵蚀力
趋势系数
倾向率
Rainfall
Erosive rainfall
Rainfall erosivity
Trend coefficient
Tendency ratio
