Testing the influence of topography and material properties on catchment-scale soil moisture patterns using remotely sensed vegetation patterns in a humid temperate catchment, northern Britain
Testing the influence of topography and material properties on catchment-scale soil moisture patterns using remotely sensed vegetation patterns in a humid temperate catchment, northern Britain
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DOI：
10.1002/hyp.9292
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发表时间：
2013-04-15
影响因子：
3.2
通讯作者：
Stevens, Carly J.
中科院分区：
文献类型：
--
作者：
Milledge, David Graham;Warburton, Jeff;Stevens, Carly J.
为了评估坡面土壤水分的表观复杂性与流域水文行为和水质的出现模式之间的关系，我们需要关于土壤水分特征的精细分辨率的流域范围的数据。这项研究提出了一种方法，将从高分辨率正射校正航空照片获得的植被模式用作土壤水分特征的指示器。这使我们能够检验一组假设，即是什么驱动了集水区尺度上土壤水分的空间模式(材料特性或地形)。我们发现，灯心草植被的格局主要受地形和流域物质性质的影响。使用地形指数表征地形，增加了相对于坡度或上坡贡献区(UCA)的土壤湿度预测的价值。然而，这些预测与在非常陡峭的坡度或低UCA处观察到的土壤水分模式不同。版权所有(C)2012 John Wiley&Sons，Ltd.
In order to evaluate the relationship between the apparent complexity of hillslope soil moisture and the emergent patterns of catchment hydrological behaviour and water quality, we need fine-resolution catchment-wide data on soil moisture characteristics. This study proposes a methodology whereby vegetation patterns obtained from high-resolution orthorectified aerial photographs are used as an indicator of soil moisture characteristics. This enables us to examine a set of hypotheses regarding what drives the spatial patterns of soil moisture at the catchment scale (material properties or topography). We find that the pattern of Juncus effusus vegetation is controlled largely by topography and mediated by the catchment's material properties. Characterizing topography using the topographic index adds value to the soil moisture predictions relative to slope or upslope contributing area (UCA). However, these predictions depart from the observed soil moisture patterns at very steep slopes or low UCAs. Copyright (c) 2012 John Wiley & Sons, Ltd.