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Comparison and quantitative assessment of two regional soil erosion survey approaches

International Soil and Water Conservation Research 2023年第4期11卷 660-668页

作者： Lixia Dong Suhua Fu Baoyuan Liu Bing Yin Faculty of Geographical Science Beijing Normal UniversityBeijing100875PR ChinaFaculty of Geographical ScienceBeijing Normal UniversityBeijing100875PR China Advanced Institute of Natural Sciences Beijing Normal University at Zhuhai519087PR China State Key Lab Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water ConservationNorthwest A&F UniversityPR China

Regional soil erosion surveys are the first step of soil conservation *** and sampling ap-proaches are commonly used for soil erosion surveys at the regional *** the grid approach,the region is divided into grids(e.g.,1 km × 1 km),and the soil erosion rate of each grid was *** the sampling approach,a small portion of the area(typically 4%or less)was taken and then the soil erosion rate was *** on the above calculation,both approaches evaluated the soil erosion area(which is the area where the soil erosion rate is greater than the soil loss tolerance(t))and its distribution in the whole *** purpose of this paper is to compare the assessment results of the two approaches and analyse their practicality using Yunyang County,Chongqing,China(area is 3636 km^(2)).The soil erosion rate,percentage of soil erosion area(PSEA,which is the ratio of the area where the soil erosion rate is greater than the soil loss tolerance(t)to the area of the total study region)and its spatial distribution were compared between the two *** results showed that the grid approach overestimated the average soil erosion rate and PSEA overall for all 33 sample units and the whole region in comparison to the sampling *** sampling approach can yield a reasonable spatial distribution of the soil erosion rate in the whole *** addition,the soil erosion regions were more clustered than those using the grid approach,which can be more suitable for soil conservation ***,the sampling approach is an efficient and practical approach in regional soil erosion *** results can provide insights into regional soil erosion surveys.

关键词： Regional soil erosion Soil erosion survey grid approach Sampling approach CSLE

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