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首页> 外文期刊>Geoderma: An International Journal of Soil Science >Soil erosion and tolerable soil loss: Insights into erosion rates for a well-managed grassland catchment
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Soil erosion and tolerable soil loss: Insights into erosion rates for a well-managed grassland catchment

机译：水土流失和可容忍的水土流失：深入了解管理良好的草地流域的侵蚀速率

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摘要

Soil erosion and its spatial and temporal variabilities are rarely placed in the context of soil production and soil depth. This study examines the question of sustainable soil erosion and soil loss in a conservatively managed grassland catchment in South East Australia in what at first appears to be a catchment with a tolerable soil loss. Catchment erosion rates are determined using the environmental tracer Cs-137. A thorough examination of the accuracy and reliability of this method is conducted across a number of spatial scales and years providing confidence in the method and results. Soil depth is measured across the study catchment providing the first bedrock map of a basalt derived soil catchment. Both soil erosion and soil depth are topographically assessed using a high resolution digital elevation model. Results show that soil depth was strongly correlated with elevation and also wetness indices indicating a strong relationship with soil moisture in soil production. Interestingly bedrock topography was decoupled from surface topography. Erosion rates using the Cs-137 method and calibrated against independent field data produced a maximum erosion rate of between 0.8 and 2.9 t ha(-1) yr(-1) using two different modelling approaches. Even though the erosion rates are low, given a mean soil depth of 0.44 m for the catchment this suggests that soil is being lost at rates greater than production. This highlights the significance of assessing erosion loss in the context of overall soil depth and production rates and that even in areas with what appears to be low soil loss rates, the loss can be higher than production. The findings provide a rationale to examine soil erosion in the context of whole catchment processes, not simply soil loss in isolation to other hill-slope and catchment data. Crown Copyright (C) 2014 Published by Elsevier B.V. All rights reserved.
机译：在土壤产量和土壤深度的背景下，土壤侵蚀及其时空变化很少。这项研究探讨了澳大利亚东南部保守管理的草地集水区中可持续的水土流失和土壤流失的问题。使用环境示踪剂Cs-137确定集水区侵蚀率。对该方法的准确性和可靠性进行了全面检查，涉及了多个空间尺度和多年，为该方法和结果提供了信心。在整个研究流域测量土壤深度，提供玄武岩衍生的土壤流域的第一张基岩图。土壤侵蚀和土壤深度均使用高分辨率数字高程模型进行地形评估。结果表明，土壤深度与海拔高度密切相关，湿度指数也与土壤湿度在土壤生产中密切相关。有趣的是，基岩地形与表面地形是分离的。使用两种不同的建模方法，使用Cs-137方法进行腐蚀速率并针对独立的现场数据进行了校准，得出的最大腐蚀速率在0.8至2.9 t ha（-1）yr（-1）之间。即使侵蚀率很低，但如果流域的平均土壤深度为0.44 m，则这表明土壤流失的速度要大于产量。这突出了在总体土壤深度和生产率的背景下评估侵蚀损失的重要性，并且即使在土壤流失率似乎较低的地区，其损失也可能高于产量。这些发现为在整个集水过程中检查土壤侵蚀提供了依据，而不仅仅是与其他山坡和集水量数据隔离的土壤流失。官方版权（C）2014，Elsevier B.V.保留所有权利。

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