Study on dynamic change of soil erosion in Karst region based on RUSLE model——Taking Panzhou City as an Example

Abstract

Abstract: To evaluate the soil erosion in Panzhou City, and to provide scientific basis for soil erosion control and land use decision. Based on GIS and modified RUSLE model, the daily rainfall of 12mm and 30mm for the erosive precipitation from the value of the use of 2000 to 2015, Panzhou City, NDVI, DEM, daily rainfall, soil and land use data to calculate the soil Erosion modulus. In the karst area, the traditional method will overestimate the total amount of soil erosion, so the improved rainfall erosivity is more in line with the local situation. The average erosion modulus in 2000 is 67.97t ha^-1yr^-1 and 23.33 in 2015 t ha^-1yr^-1| soil erosion intensity grade transfer matrix shows that most of the soil erosion intensity to a lower level of transfer, the city's soil erosion grade showed a downward trend. In the analysis of soil erosion and slope, the erosion grade is mainly concentrated in the gentle slope and the steep slope| and in 2015 the erosion rate in the steep slope of the rapid decline, which in recent years to promote ≥25° slope of all the policy of returning farmland to forest| But the slope steep valley deep area and the surrounding area of urban construction area is still the focus of future soil and water conservation.

Key words: soil erosion, RUSLE, karst, Panzhou

CLC Number:

S157.1

Hu Xianpei, Qian Qinghuan, Guo Chengcheng. Study on dynamic change of soil erosion in Karst region based on RUSLE model——Taking Panzhou City as an Example[J]. JOURNAL OF QUJING NORMAL UNIVERSITY, 2018, 37(3): 71-77.

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