中国水土保持科学2017，Vol.15Issue(4)：1-7,7.DOI:10.16843/j.sswc.2017.04.001
1980-2013年闽西地区降雨侵蚀力时空变化特征
Spatial and temporal variations of rainfall erosivity on West Fujian during 1980 to 2013
摘要
Abstract
[Background] Rainfall erosivity is for assessing the potential ability of rainfall on soil erosion.A regional soil erosion prevention and controlling work have a guiding significance.Water erosion is one of the important forms of soil erosion in Fujian province.[Methods] To study the spacetime distribution of West Fujian rainfall erosivity pattern,based on the 1980-2013 daily rainfall data of nine weather stations in West Fujian region and using the Daily Rainfall Erosion Force Model to calculate the rainfall erosion force,then methods of linear regression,climate tendency rate,Mann-Kendall test methods and the spatial interpolation methods were applied to analyze the spatial and temporal variations of rainfall erosivity.[Results] 1) The range of annual rainfall erosivity in the West Fujian was 6 160-14 310 MJ·mm/(hm2 ·h) with an average value of 9 504 MJ·mm/(hm2 ·h),the amplitude of 8 150 MJ· mm/(hm2 ·h),average rainfall erosivity was very significantly and positively correlated with the average rainfall.2) There was a spatial distribution pattern of annual rainfall erosivity and it was greater in the western area and less in the eastern area of the studied area,rainfall erosivity of high value area was in the northwest and low value area was in the northeast.The spatial distribution of average annual rainfall erosivity was similar to that of average annual precipitation;nine counties of rainfall erosivity in ascending order,respectively:Ninghua ＞ Dongxing ＞ Guanyinqiao ＞ Zhongshan ＞ Yongding ＞ Shanghang ＞ Yangjiafang ＞ Zhangping ＞ Yong'an.3) The rainfall erosivity concentrated in rainy season (March to August),which contributed 80.12％ of the whole year. During the year the distribution curve of rainfall erosivity showed bimodal type,peak for June and August.Rainfall erosivity changed in a positive trend,including January,May,June,July,August,October,November,and December,which was the most obvious in June.Meanwhile,the declining trend of rainfall eruption included February,March,April,and September,which was the most obvious in March.4) The rainfall erosivity showed upward trend in summer,but downward trend in other periods.The annual change of rainfall erosivity indicated that rainfall and rainfall erosivity showed downward trends.Rainfall to changes in the rate of decline in 7.3 mm in every 10 years,and the climate rate of rainfall erosivity was 72.7 MJ· mm/(hm2· h· 10 a).5) The abrupt change of rainfall erosivity occurred in 1995 and 2002,respectively,and rainfall erosivity had a slight upward trend since 1995,and from 2002 it had the obvious downward trend.[Conclusions] Soil erosion in the West Fujian is the key prevention area on soil and water erosion,and the government should increase attentions on it.The results of the study provide the basis for the regional soil erosion prediction,the regional risk assessment of soil erosion,and soil erosion management work.关键词
降雨量/降雨侵蚀力/时空变化/闽西地区Key words
precipitation/rainfall erosivity/spatial-temporal changes/West Fujian region分类
农业科技引用本文复制引用
戴金梅,查轩,黄少燕,陈世发,刘川,王丽园,白永会..1980-2013年闽西地区降雨侵蚀力时空变化特征[J].中国水土保持科学,2017,15(4):1-7,7.基金项目
国家科技支撑计划项目“强度侵蚀区退化生态系统修复关键技术的研发与集成”(2014BAD15B02) （2014BAD15B02）
国家重点研发计划“南方红壤低山丘陵区水土流失综合治理”(2017YFC05054) （2017YFC05054）
