Hydraulic properties of characteristic horizons depending on relief position and structure in a hummocky glacial soil landscape
Hydraulic properties of characteristic horizons depending on relief position and structure in a hummocky glacial soil landscape
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丘状冰川土壤景观中特征层位的水力特性取决于起伏位置和结构
DOI：
10.1016/j.still.2012.07.004
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发表时间：
2012
影响因子：
6.5
通讯作者：
M. Sommer
中科院分区：
文献类型：
--
作者：
Helene Rieckh;H. Gerke;M. Sommer
丘状地碛土壤景观形成了一个空间连续体或多或少的侵蚀和沉积土壤从冰川，直到集约农业耕作。室内土样测定土壤水力学特性大多局限于某些特征层位。然而，这些层位的厚度或结构和土壤发育程度可能因地形位置而异。本文比较了在代表不同土壤侵蚀/沉积程度的单个田地中不同地形位置采样的相同土壤层的土壤水力特性。水的保留曲线测定原状岩心样品使用砂和高岭土床与悬挂水柱和压力室，和非饱和导水率使用双膜装置。使用非线性曲线拟合程序RETC将数据拟合至货车van Schlichten-Mualem函数（VGM）。土壤层位的解吸持水曲线各不相同，并取决于土壤结构的发展，可以与强度的侵蚀历史在每个景观位置。水力功能的最大差异被发现为E，Bt，和C的视野。拟合的土壤水分特征曲线主要反映在VGM曲线参数n和θs值上。具有最强区分效应的景观特征与侵蚀和与地下水位的距离有关。研究结果可以帮助改善pedotransfer方法的空间分布的水力参数的估计模拟水运动的丘状土壤景观的基础上，建立景观尺度的水和元素平衡。
The hummocky ground moraine soil landscape forms a spatial continuum of more or less eroded and depositional soils developed from glacial till under intensive agricultural cultivation. Measurements of soil hydraulic properties in the laboratory on soil cores are mostly limited to some characteristic horizons. However, these horizons can vary in thickness or structural and pedological development depending on relief position. This paper compares soil hydraulic properties of the same soil horizons sampled at different relief positions in a single field representing various degrees of soil erosion/deposition. Water retention curves were determined from undisturbed core samples using sand and kaolin beds with hanging water column and pressure chambers, and the unsaturated hydraulic conductivity using the double-membrane apparatus. Data were fitted to the van Genuchten–Mualem function (VGM) using the nonlinear curve fitting program RETC. The desorption water retention curves for the soil horizons were different and depended on the soil structural development that could be related with the intensity of erosion history at each landscape position. The greatest differences in hydraulic functions were found for the E, Bt, and C horizons. The fitted soil water retention curves reflected these differences mainly in the values of the VGM curve parameters n and θs. The landscape features that have the strongest differentiating effect are related to erosion and distance towards the water table. The results can help improving pedotransfer approaches for the estimation of spatially distributed hydraulic parameters for modelling the water movement in hummocky soil landscapes as basis for establishing landscape scale water and element balances.
影响因子：
11.6
作者：
Kindler, Reimo;Siemens, Jan;Kaupenjohann, Martin
通讯作者：
Kaupenjohann, Martin