Spatio-temporal variation of wind erosivity in the northern China from 1980 to 2016
Wind is the prime power of soil wind erosion.The Weather Factor(WF)of the Revised Wind Erosion Equation(RWEQ)are the most widely used expressions of wind erosion climatic erosivity.Based on the actual situ-ation of the study area,soil freezing factor(FD)was added into the Weather Factor(WF),and the modified WF was used to evaluate wind erosivity.By calculating the yearly variation of WF,WF in different seasons and WF in differ-ent months,the temporal and spatial distribution changes of WF were drawn.WF is performed using more than wind velocity,precipitation,temperature and snow cover series at 157 national meteorological stations in 1980-2016.The following conclusions were drawn:1)WF value in the study area descended from 1980 to 1988,with an average an-nual descend rate of about 37.20 kg/m,and it was relatively stable from 1989 to 2016,with an average value of about 190.36 kg/m;2)WF value in spring accounts for about 63％of the whole year,and WF decreased most significantly in spring,with an annual descend rate of 34.94 kg/m,while the annual descend rates in summer and autumn were 3.19 kg/m and 1.87 kg/m respectively.3)On the spatial distribution,the high value area of average WF over years are mainly distributed in north 40°N of the midwestern Inner Mongolia,the eastern Xinjiang and the western Qinghai,and the low value areas were mainly distributed in the southern Xinjiang,the eastern Qinghai and the southeast of the study area.
Weather Factor(WF)wind erosionglobal warmingwind erosion regions of the northern China
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