The Wind Erosion Climatic Stress Variation In Xilingol Area

Xilingol is not only an important livestock production base in China,but also an important ecological barrier in the northern border area of China.It is also one of the most frequent sandstorm areas in China.Because of the wide area of the region,the erosion intensity of wind erosion climate has a big difference,so the degree of soil wind erosion is different.By using the meteorological observation data of 15 meteorological observation stations in Xilingol area from the year 1971 to 2015,the article selected the calculation formula of wind erosion climate factor index proposed from the United Nations Food and Agriculture Organization,and calculates the index value of wind erosion climate factor in Xilin Guo Ling area,thus the characteristics of the spatio-temporal change of wind erosion and climate erosion force in Xilingol region and its shadow are clearly defined.Ringing factor.The conclusions were showed as follow:(1)From the time variation of wind erosion climatic factor index in Xilingol area,it was found that the wind erosion climate factor index has obvious time variation characteristics.In the monthly change,the wind erosion climate factor index in the region showed a trend of increasing and then decreasing,that is,the minimum value appeared in January.With the increase of the month,the Wind erosion climatic erosivity factor increased gradually,reached the highest in April,and then declined.In terms of seasonal variation,the wind erosion climatic factors refer to seasons: spring >autumn > summer > winter.The climate factor index of wind erosion in this region is declining in the region,and the characteristics of the wind erosion climate factor index in spring,summer and autumn are the same as that in the whole year except in winter.In the interdecadal change,except for winter,the wind erosion climatic factors index of the whole year and spring,summer and autumn showed an overall downward trend.(2)From the spatial distribution of wind erosion climate factors in Xilingol area,the wind erosion climatic factor index in Xilingol area has obvious spatial distribution characteristics.On the spatial distribution of annual wind erosion climate factor index,the wind erosion climate factor index showed a gradual decline from southwest to northeast.And themaximum value appeared in Zhurihe,151.95,more than the wind erosion climatic "heavy" level(C ? 100)grading standards.The minimum value appears in the urapi,for-48.12.The spatial distribution characteristics of the climatic factors index of four seasons are the same as those of the whole year,and the maximum values appear in Zhu RI he.On the annual and seasonal scales,the study area is divided into 3 types: mild wind erosion area,moderate wind erosion area and severe wind erosion area.Besides winter,there is a slight difference between the whole year and the three quarter of spring,summer and autumn.(3)By analysized the dynamic change of main meteorological factors in Xilingol area,the main factor affecting wind erosion climate factor was wind speed.