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首页> 外文期刊>Soil Research >Hillslope runoff and erosion on duplex soils in grazing lands in semi-arid central Queensland. HI. USLE erodibility (K factors) and cover-soil loss relationships
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Hillslope runoff and erosion on duplex soils in grazing lands in semi-arid central Queensland. HI. USLE erodibility (K factors) and cover-soil loss relationships

机译：半干旱昆士兰州中部放牧地带的双坡土壤坡面径流和侵蚀。嗨USLE侵蚀性（K因子）与表土损失关系

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摘要

Measured Universal Soil Loss Equation (USLE) soil erodibility (K) values are not available for soils in grazing lands in northern Australia. The K values extrapolated from croplands are used in national and river-basin scale assessments of hillslope erosion, using an assumption that the cover factor (C) equals 0.45 for undisturbed (uncultivated) bare soil. Thus, the K needed for input into the models is the measured K for undisturbed soil (Ku) divided by 0.45.Runoff and erosion data were available for 7 years on 12 hillslope plots with cover of 10-80%, with and without grazing, with and without tree canopy cover, on a variety of soils according to various soil classification systems. Soils were grouped into those derived from sandstone (SS), mudstone (MS), and eroded mudstone (MSe). These data were used to determine USLE Ku? K, and C factor-cover relationships. Methods used to fit the parameters affected the results; minimising the sum of squares of errors in soil losses gave better results than fitting an exponential equation. The USLE LS (length-slope) factor explained the increase in measured average annual soil loss with slope, for plots with low cover. Erodibility (K) was 0.042 for SS and MS soils, irrespective of Australian Soil Classification (Chromosol, Kandosol, Rudosol, Sodosol, Tenosol); K was 0.062 for exposed, decomposing mudstone (MSe Leptic Rudosol). The measured K factor for SS and MS soils was close to that used in catchment-wide soil lossestimation for the site (0.039). This indicates that the method used for estimating K from soil properties (derived from cultivated soils) gave a reasonable estimate of K for the main duplex soils at the study site, as long as the correction for undisturbed soil is used in deriving K from measured data and in applying the USLE model. A 20% increase in K (0.050) for SS and MS soils may be warranted for heavy grazing by cattle. The C factor-cover relationship was different from the standard revised USLE(RUSLE) relationship, requiring a greater exponent ('bcov') of 0.075, rather than the default for cropland of 0.035. Increasing cover is therefore more effective at the site than suggested by the USLE. Parameters of USLE were also derived for bedload, allowing suspended load to be calculated by subtracting bedload from total soil loss.
机译：澳洲北部放牧土地上的土壤通用土壤流失方程（USLE）测得的土壤可蚀性（K）值不可用。从耕地中推断出的K值用于国家和河流流域规模的山坡侵蚀评估，假设覆盖因子（C）等于未受干扰（未经耕种）裸土的0.45。因此，输入模型所需的K为未经扰动的土壤的实测K（Ku）除以0.45。在有和没有放牧的情况下，在12个坡度为10-80％的山坡样地上可获得7年的径流和侵蚀数据，根据各种土壤分类系统，在有各种土壤的情况下，带或不带树冠覆盖物。土壤分为来自砂岩（SS），泥岩（MS）和侵蚀泥岩（MSe）的土壤。这些数据用于确定USLE库？ K和C因子覆盖关系。拟合参数的方法影响了结果;与拟合指数方程相比，最小化土壤损失误差平方和的结果更好。 USLE LS（长度-坡度）因数解释了在低覆盖率土地上测得的年平均土壤流失量随坡度的增加。与澳大利亚土壤分类（Chromosol，Kandosol，Rudosol，Sodosol，Tenosol）无关，SS和MS土壤的可蚀性（K）为0.042。裸露的分解泥岩（MSe Leptic Rudosol）的K为0.062。 SS和MS土壤的实测K系数与该地点集水区土壤流失估算中使用的系数相近（0.039）。这表明，只要使用未扰动土壤的校正值从测量数据中得出K值，用于从土壤特性（源自耕作土壤）估算K的方法就可以对研究地点的主要双联土壤K值进行合理估算。并应用USLE模型。 SS和MS土壤的K值增加20％（0.050），可能是由于牛大量放牧而引起的。 C因子-覆盖关系与标准修订的USLE（RUSLE）关系不同，要求更大的指数（'bcov'）为0.075，而不是默认的耕地0.035。因此，增加覆盖范围比在USLE建议的位置更有效。还推导出了USLE的床荷参数，从而可以通过从总土壤流失中减去床荷来计算悬挂荷载。

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