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首页> 外文期刊>Geoderma: An International Journal of Soil Science >Effects of slope aspect, grazing, and sampling position on the soil penetration resistance curve
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Effects of slope aspect, grazing, and sampling position on the soil penetration resistance curve

机译：坡面，放牧和取样位置对土壤穿透曲线的影响

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摘要

The slope aspect, grazing intensity, and vegetation canopy are factors that affect the physical and mechanical properties of soil. However, their effects on the soil penetration resistance (PR) curve are unclear. Thus, we investigated the effects of northern and southern slope aspects, the grazing intensity (free and controlled grazing, and livestock exclusion), and the sampling position (beneath and between canopy) on the PR curve and bulk density in the Gonbad paired watershed in Hamedan, Iran. At the end of the grazing season, we collected and analyzed seven undisturbed samples (total = 252) and one disturbed soil sample (total = 36) from each experimental unit. The soil PR was measured at different suctions. We fitted the To and Kay (2005) and Stock and Downes (2008) models to the PR data. The effects of treatments on the bulk density, PR curve and its model coefficients, and PR were analyzed at different suctions. The slope aspect had the greatest impact on the soil bulk density and PR at suctions of 30 and 1500 kPa. The Stock and Downes (2008) model coefficients, which represent the degree of change in the PR relative to the moisture content, were affected mostly by the sampling position. Southern aspects had higher overall PR curves than northern aspects due to their lower soil organic matter contents and more coarse fragments. The overall PR curve increased with the grazing intensity. There were interactions between the effects of the three factors on the PR curve and all affected the PR.
机译：斜坡方面，放牧强度和植被冠层是影响土壤物理和力学性能的因素。然而，它们对土壤渗透性（PR）曲线的影响尚不清楚。因此，我们调查了北部和南方坡面方面的影响，放牧强度（自由和受控放牧和牲畜排斥），以及在GONBAD配对流域中的PR曲线和散装密度的采样位置（下落） Hamedan，伊朗。在放牧季节结束时，我们收集并分析了七个未受干扰的样品（总= 252）和每个实验单元的一个干扰的土样品（总= 36）。土壤PR在不同的吸盘中测量。我们将To和Kay（2005）和股票和拖船（2008）模型安装到PR数据。在不同的吸附分析了处理对散装密度，PR曲线及其模型系数的影响。斜坡方面对30和1500 kPa的起诉时的土壤堆积密度和PR产生最大的影响。股票和拖船（2008）模型系数，其代表PR相对于水分含量的变化程度，主要受采样位置的影响。由于其较低的土壤有机物质含量和更粗碎片，南方方面具有比北方方面更高的总PR曲线。总PR曲线随着放牧强度而增加。在PR曲线上的三个因素的影响与所有影响PR之间存在相互作用。

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