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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Saturated hydraulic conductivity of soils in the Southern Piedmont of Georgia, USA: field evaluation and relation to horizon and landscape properties.
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Saturated hydraulic conductivity of soils in the Southern Piedmont of Georgia, USA: field evaluation and relation to horizon and landscape properties.

机译：美国佐治亚州南部皮埃蒙特土壤的饱和导水率：田间评估及其与地平线和景观特性的关系。

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摘要

Saturated hydraulic conductivity (Ks) is one of the soil properties used most often to predict soil behavior and suitability for a variety of uses. Because of the difficulty in Ks measurement and its variability with depth and across the landscape, Ks is commonly predicted from other more easily evaluated properties including texture, clay mineralogy, bulk density, pedogenic structure and cementation. Of these, texture and pedogenic structure are most commonly used to estimate Ks, but the reliability of these estimates has not been evaluated for common soils in the Southern Piedmont of Georgia. Thus, the objectives of this study were to evaluate Ks for major horizons in soils and landscapes in the Georgia Piedmont and to relate Ks to morphological properties of these horizons. Ten sites across the region were selected, and 21 pedons arranged in three transects were described from auger holes and pits. For each pedon, Ks was measured in upper Bt horizons, at 140 cm below the surface (Bt, BC, or C horizon), and at a depth intermediate between the shallow and deep measurements (Bt, BC, or C horizon) with a constant head permeameter. The Ks of individual horizons ranged from 1x10-8 to 2x10-5 m s-1. At six of 10 sites evaluated, clayey upper Bt horizons had higher Ks than deeper horizons with less clay. This difference was attributed to weaker structure in the deeper BC horizons. Structural differences did not explain all variation in Ks with depth, however. Other soil and landscape properties including parent material composition, colluvium on lower slope positions, C horizon cementation, and depth of soil development also affected Ks of horizons in these soils and should be used to better estimate Ks.
机译：饱和导水率（Ks）是最常用于预测土壤行为和适用于各种用途的土壤特性之一。由于测量Ks的困难及其在深度和整个景观中的变化性，通常从其他更容易评估的属性（包括质地，粘土矿物学，堆积密度，成岩结构和胶结作用）来预测Ks。其中，质地和成岩结构最常用于估算Ks，但是尚未对乔治亚州南部皮埃蒙特的常见土壤评估这些估算的可靠性。因此，本研究的目的是评估佐治亚州皮埃蒙特土壤和景观中主要层位的Ks，并将Ks与这些层位的形态特征联系起来。选择了该地区的十个站点，并从螺旋钻的孔和坑中描述了在三个样带中排列的21个脚架。对于每个脚踏板，Ks均在较高的Bt视界，在表面以下140厘米处（Bt，BC或C视界）以及在浅和深测量之间的深度（Bt，BC或C视界）内测量。恒定的磁头渗透仪。各个层的Ks范围从1x10-8到2x10-5 m s-1。在评估的10个地点中的6个，黏土的较高Bt层的Ks高于黏土较少的较深层的Ks。这种差异归因于卑诗省较深层的结构较弱。然而，结构差异并不能解释Ks随深度的所有变化。其他土壤和景观属性，包括母体成分，下坡位置的坡度，C层胶结作用和土壤发育深度，也影响了这些土壤中的Ks值，应将其用于更好地估算Ks。

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