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首页> 外文期刊>Geomorphology >Soil erosion rates in two karst peak-cluster depression basins of northwest Guangxi, China: Comparison of the RUSLE model with (CS)-C-137 measurements
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Soil erosion rates in two karst peak-cluster depression basins of northwest Guangxi, China: Comparison of the RUSLE model with (CS)-C-137 measurements

机译：广西桂西北两个喀斯特峰丛洼地盆地的土壤侵蚀速率：RUSLE模型与（CS）-C-137测量值的比较

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摘要

Reliable estimation of erosion in karst areas is difficult because of the heterogeneous nature of infiltration and subsurface drainage. Understanding the processes involved is a key requirement for managing against karst rock desertification. This study used the revised Universal Soil Loss Equation (RUSLE) to estimate the annual soil erosion rates on hillslopes and compared them with Cs-137 budget in the depressions at two typical karst peak-cluster depression basins in northwest Guangxi, southwestern China. Runoff plots data were used to calibrate the slope length factor (L) of the RUSLE model by adjusting the accumulated area threshold. The RUSLE model was sensitive to the value of the threshold and required DEMs with 1 m resolution, due to the discontinuous nature of the overland flow. The average annual soil erosion rates on hillslopes simulated by the RUSLE were 0.22 and 0.10 Mg ha(-1) y(-1) 2006 through 2011 in the partially cultivated GZ1 and the undisturbed GZ2 basins, respectively. The corresponding deposition rates in the depressions agreed well with the Cs-137 records when recent changes in precipitation and land use were taken into consideration. The study suggests that attention should be given to the RUSLE-L factor when applying the RUSLE on karst hillslopes because of the discontinuous nature of runoff and significant underground seepage during storm events that effectively reduces the effects of slope length. (C) 2015 Elsevier B.V. All rights reserved.
机译：由于渗透和地下排水的非均质性，很难可靠地估算喀斯特地区的侵蚀。了解所涉及的过程是防治喀斯特岩石荒漠化的关键要求。这项研究使用修订后的通用土壤流失方程（RUSLE）估算了山坡上的年土壤侵蚀率，并将其与中国西南广西两个典型的喀斯特峰丛洼地盆地的洼地中的Cs-137预算进行了比较。径流图数据用于通过调整累积面积阈值来校准RUSLE模型的斜率因子（L）。由于地面流量的不连续性，RUSLE模型对阈值和分辨率为1 m的DEM敏感。通过RUSLE模拟，2006年至2011年在部分耕种的GZ1和未受干扰的GZ2盆地中，山坡的年平均土壤侵蚀率分别为0.22和0.10 Mg ha（-1）y（-1）。考虑到近期降水和土地利用的变化，洼地中相应的沉积速率与Cs-137记录非常吻合。研究表明，在喀斯特山坡上应用RUSLE时应注意RUSLE-L因子，因为径流的不连续性和暴风雨期间的大量地下渗流有效地减小了边坡长度的影响。 （C）2015 Elsevier B.V.保留所有权利。

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  • 来源
    《Geomorphology》 |2016年第15期|217-224|共8页
  • 作者

    Feng Teng; Chen Hongsong; Polyakov Viktor O.; Wang Kelin; Zhang Xinbao; Zhang Wei;

  • 作者单位

    Chinese Acad Sci, Inst Subtrop Agr, Key Lab Agroecol Proc Subtrop Reg, Changsha 410125, Hunan, Peoples R China|Chinese Acad Sci, Huanjiang Observat & Res Stn Karst Ecosyst, Huanjiang 547100, Guangxi, Peoples R China|Univ Chinese Acad Sci, Beijing 100049, Peoples R China;

    Chinese Acad Sci, Inst Subtrop Agr, Key Lab Agroecol Proc Subtrop Reg, Changsha 410125, Hunan, Peoples R China|Chinese Acad Sci, Huanjiang Observat & Res Stn Karst Ecosyst, Huanjiang 547100, Guangxi, Peoples R China;

    ARS, USDA, Southwest Watershed Res Ctr, Tucson, AZ 85719 USA;

    Chinese Acad Sci, Inst Subtrop Agr, Key Lab Agroecol Proc Subtrop Reg, Changsha 410125, Hunan, Peoples R China|Chinese Acad Sci, Huanjiang Observat & Res Stn Karst Ecosyst, Huanjiang 547100, Guangxi, Peoples R China;

    Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Environm Evolvement & Regulat, Chengdu 610041, Sichuan, Peoples R China;

    Chinese Acad Sci, Inst Subtrop Agr, Key Lab Agroecol Proc Subtrop Reg, Changsha 410125, Hunan, Peoples R China|Chinese Acad Sci, Huanjiang Observat & Res Stn Karst Ecosyst, Huanjiang 547100, Guangxi, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Karst; RUSLE; Calibration; Slope length; Cs-137;

    机译：岩溶;RUSLE;标定;边坡长度;Cs-137;

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