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首页> 外文会议>Erosion and sediment yields in the changing environment >Estimation of the spatial distribution of soil erosion in the hilly area of Sichuan, China
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Estimation of the spatial distribution of soil erosion in the hilly area of Sichuan, China

机译：四川丘陵区土壤侵蚀空间分布估算

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摘要

The hilly area of Sichuan (China) has suffered from soil erosion as a result of the intensive agriculture and steep topography. Many different methods have been used for the estimation of soil erosion and no clear consensus about erosion rates and subsequent sediment delivery ratios (SDR) has been reached. In this study, the Universal Soil Loss Equation (USLE) with different parameter estimation methods was applied to two river basins (i.e. Weichenghe (WCH) and Lizixi (LZX)) with the help of GIS techniques. The results were compared with those of previous studies based on remote sensing, erosion plots or the ~(137)Cs technique. The main results can be summarized as: (1) different rainfall erosivity estimation methods generate vastly different results; (2) using two-dimensional slope length produces higher soil erosion rate estimates and lower SDRs than the conventional approach in USLE; (3) the average annual soil erosion rates for WCH and LZX were estimated at 706 t km~(-2) year~(-1) and 3040 t km~(-2) year~(-1), respectively, and the corresponding sediment delivery ratios at 0.27 and 0.38; and (4) the high erosion rates reflect the high altitude and intensive agricultural land use.
机译：集约化农业和陡峭的地形使四川（中国）的丘陵地区遭受了土壤侵蚀。已使用许多不同的方法来估算土壤侵蚀，但尚未就侵蚀速率和随后的沉积物输送比（SDR）达成明确共识。在这项研究中，借助GIS技术，将具有不同参数估算方法的通用土壤流失方程（USLE）应用于两个流域（即渭城河（WCH）和利兹溪（LZX））。将结果与先前基于遥感，侵蚀图或〜（137）Cs技术的研究结果进行了比较。主要结果可以归纳为：（1）不同的降雨侵蚀力估算方法产生了截然不同的结果； （2）与USLE中的常规方法相比，使用二维边坡长度可产生更高的土壤侵蚀率估算值和更低的SDR； （3）WCH和LZX的年均土壤侵蚀率估计分别为706 t km〜（-2）年〜（-1）和3040 t km〜（-2）年〜（-1），而相应的泥沙输送比分别为0.27和0.38; （4）高侵蚀率反映出高海拔地区和农业用地集约利用。

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  • 来源
  • 会议地点 Chengdu(CN)
  • 作者

    XIAOLI JIN; GENWEI CHENG; C-Y XU; JIHUI FAN; ZELONG MA;

  • 作者单位

    Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, Sichuan 610041, China,Sichuan Hydraulic Science Research Institute, Chengdu 610072, China;

    Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, Sichuan 610041, China;

    Department of Geosciences, University of Oslo, Norway;

    Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, Sichuan 610041, China;

    Sichuan Hydraulic Science Research Institute, Chengdu 610072, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    USLE; rainfall erosivity; soil erosion rate; spatial distribution;

    机译：USLE；降雨侵蚀力土壤侵蚀率；空间分布;

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