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| Analysis of rainfall erosivity on sloping land of Quaternary Red Earth in North Jiangxi Province |
| Zheng Haijin1,2,Fang Shaowen1,3,Yang Jie1,Tang Chongjun1,Wang Bangwen1,Song Yuejun1 |
| 1.Jiangxi Institute of Soil and Water Conservation,330029,Nanchang;2.College of Soil and Water Conservation,Beijing Forest University,100083,Beijing;3.College of Land Resources and Environment,Jiangxi Agricultural University,330045,Nanchang: China |
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Abstract Rainfall erosivity is necessary to develop the soil erosion model.To study the law of rainfall erosivity on sloping land of quaternary red earth,an experimental spot was estabished on the representative area to investigate rainfall and sediment from 2001 to 2005.The relations between rainfall parameters and sediment amount were analyzed.Then,rainfall erosivity was calculated and its distribution regular in time was studied.At last,the relation between rainfall erosivity and precipitation was analyzed for easy caculation.It is suggested that ∑EI30 can represent commendably rainfall erosivity in the study area.Rainfall erosivity is variabile in yearly and monthly distribution,and mainly distributes between April and September,accounting for 91.66 percent among that in one year.It is also shown that rainfall erosivity has similar trendency in time distribution with precipitation,and their correlation coefficient is 0.838.The prediction equation of rainfall erosivity is important to estimate rainfall erosivity when the continuous record of rainfall is lack.
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Received: 26 May 2009
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