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《Journal of Soil and Water Conservation》 2017-04
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Influencing Factors of Wind Erosion and Their Quantitative Relationships with Erosion Rate in Black Soil Area of Northeast China

LIN Yi;LI Heping;XIAO Bo;College of Resources and Environmental Sciences,China Agricultural University;Key Laboratory of Arable Land Conservation in North China,Ministry of Agriculture;State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau;  
In order to identify the influencing factors of wind erosion in black soil area of Northeast China,the wind erosion rates of black soil under different wind speeds(5~14m/s),soil water contents(2%~11%),and straw coverage rates(0~80%)were measured through a series of simulated wind experiments.Subsequently,the relationships between the wind erosion rate of black soil and the factors were quantitatively analyzed.The results showed that the black soil began to be eroded when the wind speed was slightly greater than 5m/s,and wind erosion rate of black soil increased exponentially with increasing wind speed.The wind erosion rate under 14m/s of wind speed(at 2% of soil water content)was 11.6~42.7times higher than that under 8m/s of wind speed.Moreover,the wind erosion rate of black soil increased with the increasing of soil water content when the soil water content was less than 5%,while it decreased with the increasing of soil water content when the soil water content was between 5% and 11%.Especially,the wind erosion rate of black soil was close to zero when the soil water content exceeded 11%.In addition,the wind erosion rate of black soil was significantly reduced by straw cover and an exponential relationship was found between them.For instance,the wind erosion rate of black soil with 20% of straw coverage(at 2% of soil water content)was72.6%~92.3%lower than that of bare land.However,wind erosion rate was only decreased by 0.02~1.20g/(m2·s)when the straw coverage increased from 20%to 80%(at 2% of soil water content).In conclusion,wind erosion rate of black soil was significantly affected by wind speed,soil water content,and straw coverage rate in Northeast of China in this study,and their importance in decreasing wind erosion listed in the order of wind speedsoil water contentstraw coverage rate.
【Key Words】: black soil degradation wind erosion of black soil wind speed soil water content straw coverage rate
【Fund】: 中央高校基本科研业务费专项(2017QC048)
【CateGory Index】: S157.1
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