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| Spatial and temporal variations of rainfall erosivity on West Fujian during 1980 to 2013 |
| DAI Jinmei1,2, ZHA Xuan1,2, HUANG Shaoyan1,2, CHEN Shifa1,2, LIU Chuan1,2, WANG Liyuan1,2, BAI Yonghui1,2 |
1. Subtropical Fujian Province Key Laboratory of Resources and Environment, 350007, Fuzhou, China;
2. College of Geographical Sciences, Fujian Normal University, 350007, Fuzhou, China |
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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 space-time 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.
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Received: 22 July 2016
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