Effect Of Wind Erosion On Soil Organic Carbon In Junggar East Of Xinjiang

Wind erosion is one of the major ecological environmental problems in the world at present,and it is also the main driving force of soil erosion and soil desertification.Soil organic carbon is one of the important indicators to measure soil fertility and soil quality,and strong soil wind erosion is to strip surface soil.At the same time,it also took away a large amount of organic carbon in the soil,resulting in a sharp drop in soil quality and a decrease in land productivity,thus seriously threatening the living environment of human beings.Xinjiang is the largest province in China.It is located in the arid and semi-arid regions in the hinterland of Asia and Europe.It belongs to the temperate continental climate and is one of the most severe provinces in terms of wind erosion.It has a large erosion area and a high degree of desertification.Desertification caused by wind erosion has been It has become a major environmental problem that Xinjiang urgently needs to solve.Located on the edge of the Gurbantunggut Desert,the Zhundong region is one of the areas with the most severe wind erosion in Xinjiang.The year-round wind erosion has resulted in a barren soil and an extremely fragile ecological environment.In order to understand the influence of wind erosion on soil redistribution and soil organic carbon dynamics in the study area,the study selected the Zhundong area as the study area.Five different land use types were selected in the study area,and ¹³⁷Cs was used as a tracer to pass through the field.Soil redistribution characteristics of different land use types under wind erosion were analyzed by sampling and laboratory experiments;the relationship between 137Cs?Bq/kg and Bq/m³?and soil organic carbon in soil profiles under different land use types was analyzed,and soil wind erosion in this area was explored.The effect of soil redistribution on soil carbon,and the significance of soil ¹³⁷Cs on organic carbon,calculation of soil wind erosion rate under different land use types,and calculation of soil organic carbon loss rate based on soil wind erosion rate and surface organic carbon content.The results of the study further explain the carbon loss mechanism of wind erosion lands in the Qudong area,and provide scientific evidence for the treatment and protection of severe desertification in the local area and restoration of fragile ecosystems.Through the study,the following conclusions are drawn:The PSD of soil in the study area: The soil particles are mainly composed of sand and silt while the clay is exhausted.The soil texture is mainly sand soil and loamy sandy soil.The soil organic carbon content is overall low,with an average value of 3.13 g/kg.The soil in the study area is extremely alkaline and soil salinization is very serious in some areas.According to the vertical distribution of ¹³⁷Cs in the soil profile,there are significant differences in the vertical distribution of ¹³⁷Cs under different land use types.The soil profiles of R1 and R2 sampling points are normal profiles as the background sample points of this paper.The soil profile at the CL1 and CL2 sampling points is perturbation profiles.The soil profile at the BL2 sampling point is an erosion-deposition composite profile,and others are erosion profiles.The analysis of the correlation between 137Cs?Bq/kg and Bq/m³?and soil organic carbon in soil profiles under different land use types shows that the activity of soil ¹³⁷Cs in soil profiles in bare land,fixed sandy land,semi-fixed sandy land and desert grassland sampling sites was extremely significant associated with SOC?p<0.01?,and there is no statistically significant correlation between cultivated soil samples.The total amount of ¹³⁷Cs in the soil profile of bare ground samples is extremely significant associated with SOC?p<0.01?,and significantly in the soil profile at semi-fixed sand sampling sites?p<0.05?.This paper compares the soil erosion rate calculation model and selects the appropriate model to calculate the soil erosion rate under different land use types in the study area.The average rate of wind erosion in the study area is 3883.28 t/?km2·a?,of which: fixed sand is light Erosion;moderate erosion in bare land and desert grassland;strong erosion in semi-fixed sandy land and cultivated land.The soil organic carbon loss rate was calculated based on the soil wind erosion rate.The rate of organic carbon loss was 54.17 t/?km2·a?for arable land samples,10.06 t/?km2·a?for desert grassland,and bare soil was 6.51 t/?km2·a?,462 t/?km2·a?for semi-fixed sandy land and 3.60 t/?km2·a?for fixed sandy land.