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《Research of Soil and Water Conservation》 2018-01
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Soil Erosion and Its Influence Factors on a Slope in the Wind-Water Erosion Crisscross Region on the Loess Plateau

ZHANG Jiaqiong;LIU Zhang;YANG Mingyi;ZHANG Fengbao;WANG Yongji;DENG Xinxin;State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Institute of Soil and Water Conservation,Northwest A & F University;Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources;Rare Earth Research Institute of Baotou;  
The alternating effect of wind and water erosion intensified soil loss in the wind-water erosion crisscross region,and formed a complicated erosion environment on the Loess Plateau.This study selected a hill going from northwest to east in the Liudaogou watershed of Shenmu County as the site to collect soil samples used for measuring ~(137)Cs and grain size.The distribution of soil grain size,erosion rate and the influence factors were studied.The results showed that grain-size and soil erosion had significant variations(p0.05)on two slopes with obvious undulation.The change of soil erosion was affected by conditions of underlying surface including slope position,gradient,vegetation,soils and land use type besides erosion forces(wind and rainfall).The results of principal component analysis showed that there were two components including all underlying surface factors.They explained that the variations of soil erosion ranged from 69.6% to 82.1% .The linear regression between soil erosion rate and these four factors(slope position,gradient,vegetation,soil and land use types)implied the importance of erosion forces besides underlying surface conditions.Unfortunately,spatial distribution of soil erosion on a single slope is unlikely to represent the general erosion pattern in this region,the ~(137)Cs tracing technique and grain-size analysis were far away from quantita-tively dividing the contribution of wind erosion and water erosion in the total erosion on the slope scale.Further study with better methods and techniques is necessary.
【Fund】: 国家自然科学资助项目(41401314 41371283);; 中国科学院重点部署项目(KZZD-EW-04-03);中国科学院“西部之光”人才培养计划西部博士项目;; 陕西省自然科学基础研究计划项目(2015JQ4115)
【CateGory Index】: S157.1
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