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The assessment of soil loss by water erosion in China

International Soil and Water Conservation Research, 2020-12, Vol.8 (4), p.430-439 [Peer Reviewed Journal]

ISSN: 2095-6339 ;DOI: 10.1016/j.iswcr.2020.07.002

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  • Title:
    The assessment of soil loss by water erosion in China
  • Author: Baoyuan Liu ; Yun Xie ; Zhiguang Li ; Yin Liang ; Wenbo Zhang ; Suhua Fu ; Shuiqing Yin ; Xin Wei ; Keli Zhang ; Zhiqiang Wang ; Yingna Liu ; Ying Zhao ; Qiankun Guo
  • Subjects: Chinese soil loss map ; CSLE ; National soil erosion survey ; Ratio of soil erosion area ; Sample units ; Soil erosion rate
  • Is Part Of: International Soil and Water Conservation Research, 2020-12, Vol.8 (4), p.430-439
  • Description: Soil erosion is a major environmental problem in China. Planning for soil erosion control requires accurate soil erosion rate and spatial distribution information. The aim of this article is to present the methods and results of the national soil erosion survey of China completed in 2011. A multi-stage, unequal probability, systematic area sampling method was employed. A total of 32,948 sample units, which were either 0.2–3 km2 small catchments or 1 km2 grids, were investigated on site. Soil erosion rates were calculated with the Chinese Soil Loss Equation in 10 m by 10 m grids for each sample unit, along with the area of soil loss exceeding the soil loss tolerance and the proportion of area in excess of soil loss tolerance relative to the total land area of the sample units. Maps were created by using a spatial interpolation method at national, river basin, and provincial scales. Results showed that the calculated average soil erosion rate was 5 t ha−1 yr−1 in China, and was 18.2 t ha−1 yr−1 for sloped, cultivated cropland. Intensive soil erosion occurred on cropland, overgrazing grassland, and sparsely forested land. The proportions of soil loss tolerance exceedance areas of sample units were interpolated through the country in 250 m grids. The national average ratio was 13.5%, which represents the area of land in China that requires the implementation of soil conservation practices. These survey results and the maps provide the basic information for national conservation planning and policymaking.
  • Publisher: KeAi Communications Co., Ltd
  • Language: English
  • Identifier: ISSN: 2095-6339
    DOI: 10.1016/j.iswcr.2020.07.002
  • Source: DOAJ Directory of Open Access Journals
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