Agricultural Industry Response To Different Erosion Environments In Loess Hilly Region

The coordinated development of ecological environment and agricultural industry is the key to the development of rural economy in the Loess Hilly area.Soil erosion is serious in the Loess Hilly area.Will the development characteristics of agricultural industry(planting,forestry,animal husbandry)be affected by the change of soil erosion intensity?Based on the land use change in 2000,2008 and 2013,combined with vegetation cover and slope,the characteristics of soil erosion(surface erosion)in the typical loess hilly area(Ansai,Anding and Yuanzhou)were analyzed under ArcGIS,path coefficient was used to analyze the factors of agricultural output value under different erosion environments,The response characteristics of agricultural output density to the change of soil erosion modulus were analyzed in both time and space.The research results are as follows:(1)From 2000 to 2013,the land use structure of Ansai District changed greatly,the area of cultivated land decreased by 360.69 km2,mainly transferred to woodland and grassland.The land use structure of Anding District and Yuanzhou District changed slightly.The cultivated land area of Anding District decreased by 53.43 km2,mainly transferred to woodland construction land.The cultivated land area of former Prefecture decreased by 44.45 km2,mainly transferred to construction land.Analyzing the land use of different slopes,Ansai area has the largest slope,the smallest in the former Prefecture and the middle in the Anding area.(2)From 2000 to 2013,the intensity of soil erosion changed greatly.The main erosion types changed from moderate,intense and extremely intense erosion to moderate and mild erosion.In the same year,the modulus of soil erosion in Ansai area(6118 t/(km2 a),4303 t/(km2·a),2816 t/(km2·a))was the largest,followed by the stable area(4834 t/(km2·a),4353 t/(km2·a),2405 t/(km2.a)),and the original state area(4049 t/(km2 a),3478 t/(km2·a),2228 t/(km2·a))were the smallest.From the spatial distribution of soil erosion intensity and land use change on different slopes,it was found that there were significant differences in soil erosion environment in the three study areas.(3)The density of agricultural output value varies with the modulus of soil erosion in different counties.There is a linear relationship between planting output density and soil erosion modulus,and the larger the output density,the smaller the soil erosion modulus;the change rule of forestry output density and soil erosion modulus is not obvious;the change rule of livestock output density and soil erosion modulus has a certain law,which shows that the erosion modulus increases and the livestock output value decreases.From the point of time series,the change of agricultural output density and soil erosion modulus has certain regularity.From the point of spatial distribution,there is no obvious regularity between agricultural output density and soil erosion modulus,which is greatly influenced by the natural endowment and land use structure of each township.In summary,the change of land use structure in Ansai District is larger than that in Anding District and Yuanzhou District.The change of soil erosion shows a trend of moderate,strong and extremely intense erosion transferring to moderate,light and slight erosion.The transferring extent in Ansai District is the largest.The response characteristics of planting,forestry and animal husbandry output density in different erosion environments are different.The response characteristics of planting are similar,and that of forestry and animal husbandry are similar.The response characteristics of different agricultural industries to the same erosion environment are different,and the response characteristics of planting,forestry and animal husbandry are different.