| Soil erodibility is an indicator of the sensitivity of soil properties to erosion,which is an important basis for quantitative assessment of soil erosion and water and soil erosion.The accurate estimation of the soil erodibility K is the prerequisite for the construction of soil erosion model.At present,the estimation of the K value of the soil erodibility factor is mostly limited by the method of U.S.and Europe and the method for the applicability of different regions.The foreign erodibility estimation model can not be applied to the estimation of soil erodibility in China.The existence of these problems has greatly hindered the progress and accuracy of soil erosion prediction research.Based on the dynamic monitoring and announcement of soil and water loss and the characteristics of Song Liao River Basin,this study studied the K value of different soil types in the central agricultural area of Jilin Province.Study distribution and temporal and spatial variation of soil erodibility of cultivated soil in central agricultural area of Jilin Province.Combined with the USLE for the central agricultural area of Jilin Province of soil and water loss quantitative assessment,soil and water conservation monitoring,quantitative assessment of soil erosion,land use planning to provide the basis.Taking the central agricultural area of Jilin Province as the research object,this paper discusses the different soil types soil corrosion K value size,different terrain characteristics of different soil types of K value space and nearly 20 years,Jilin Province soil corrosion the space-time change of K value,the main results were as follows:(1)Soil samples obtained from 59 of the selected surface soil corrosion K value and negatively correlated with organic matter into.Soil texture and the K value,the relationship between soil erosion K value and silt?silt+very fine sand were positively correlated,and negatively correlated with sand content,no correlation with the clay content.Powder sand + very fine sand content on soil corrosion K value is the largest.Soil erosion K value has no correlation with the soil bulk density.(2)According to the 15 kinds of soil,the 14 classes,according to the calculated soil type area merge the four types of soil erosion K value of size: K black soil > K chernozem > K white pulp soil > K dark brown soil.Northwest central Jilin Province agriculture for soil erosion is larger concentrated distribution area,southern region,the eastern region is relatively corrosion the minimal.(3)Under the condition of typical land topography,soil corrosion K values of different landform parts show the bottom of the K value is higher than the top K values.With the top and bottom of the mechanical composition,different permeability,and also under the condition of water erosion slope and bottom erosion by the external agent has much to do.(4)According to the "Chinese soil species",the raster data and the 59 mixed soil samples measured in 2015-2016,the K value of chernozem,black soil and albic soil in the central agricultural area of Jilin Province,from 1994 to 2016,the overall increase trend,the increase was 50.65%,76.16% and 47.84%.For the dark brown soil,the K value increased by 47.74% between 1994 and 2011,while the K value decreased by 23.58% between 2011 and 2016.According to the three divisions of the Songliao River Basin,the soil erodibility K of the Diffuse Sichuan flood duty soil conservation area is 0.03886 t · hm2 h / hm2 · MJ · mm;the soil erodibility K in the mountainous hilly water quality of Changbai Mountain is 0.03863 t · hm2 h / hm2 · MJ · mm.The soil erodibility of in the northeastern China of Diffuse Sichuan flood duty soil conservation area and Changbai Mountain and the mountainous hilly water quality during the 1994 and 2016 continued to grow. |
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