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[1]KEO Soksamnang,HE Hongming,ZHAO Hongfei,et al.Analysis of Rainfall Erosivity Change and Its Impacts on Soil Erosion on the Loess Plateau over More than 50 Years[J].Research of Soil and Water Conservation,2018,25(02):1-7.

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Analysis of Rainfall Erosivity Change and Its Impacts on Soil Erosion on the Loess Plateau over More than 50 Years

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 25 Number of periods: 2018 02 Page number: 1-7 Column: Public date: 2018-04-03

Title:: Analysis of Rainfall Erosivity Change and Its Impacts on Soil Erosion on the Loess Plateau over More than 50 Years

Author(s):: KEO Soksamnang¹, HE Hongming^1,2, ZHAO Hongfei¹, JING Zhaowei¹; 1. State of Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A & F University, Yangling, Shaanxi 712100, China;
2. State of Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation, CAS and MWR, Yangling, Shaanxi 712100, China

Keywords:: soil erosion; spatiotemporal distribution; rainfall; the Loess Plateau

CLC:: S157.1

DOI:: -

Abstract:: On the basis of precipitation database from 1960 to 2011, 58 meteorological stations and sediment transportation data were collected on the Loess Plateau. We adopted the ways of the Mann-Kendall test and slope change ratio of cumulative quantity to analyze the spatial and temporal variation characteristics and its impact on soil erosion. The results showed that:(1) annual rainfall erosivity presents distinct declining trend on the Loess Plateau, the annual declining rate was 3.64 MJ·mm/(hm²·h·a); (2) the spatial change character was that the big one became smaller, and small one became bigger, under the dividing line of 400 mm rainfall lines; (3) the change of rainfall erosivity had important influence on the change of sediment transport, but was not the dominant factor, the contribution rates of the Wei River, Jing River, Beiluo River, Yan River, Wuding River, Fen River were 1.54%, 0.11%, 10.87%, 16.47% and 5.71%, respectively; (4) the relation of rainfall erosivity and sediment discharge was different in different basins in the middle reaches of the Yellow River, the rates of erosion and sediment yield of major tributaries decreased in the sequence:Jing River > Wuding River > Wei River > Yan River > Beiluo River > Fen River. The distribution character and change trend of rainfall erosivity combining with rate of erosive sediment yield in different basins could serve as the indexes for evaluating the rainfall effect on soil erosion.

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