Seasonal and event dynamics of spatial soil moisture patterns at the small catchment scale
Seasonal and event dynamics of spatial soil moisture patterns at the small catchment scale
复制标题
小流域尺度土壤湿度空间格局的季节和事件动态
DOI：
10.1029/2011wr011518
复制
发表时间：
2012
影响因子：
5.4
通讯作者：
H. Vereecken
中科院分区：
文献类型：
--
作者：
Rosenbaum;H.R. Bogena;M. Herbst;J.A. Huisman;T.J. Peterson;A. Weuthen;A.W. Western;H. Vereecken
由于测量的限制，我们对空间土壤水分模式的短期和长期动态的理解是有限的。利用新的高度详细的数据，这项研究的目的是检查季节和事件尺度的空间土壤水分动态的表土和底土的小云杉覆盖的Wüstebach集水区，德国。为了实现这一点，对使用无线传感器网络SoilNet获得的1年4-D数据集进行了单变量和地理统计分析。我们发现表土土壤水分空间格局存在很大差异，主要与气象强迫有关。在底土中，由于土壤水分再分配过程和根系吸水，时间动态减少。表土范围一般随土壤湿度的降低而增加。表层土壤水分的空间标准差（SDθ）与平均含水量（）之间的关系呈凸形，这在湿润温带气候条件下是常见的。观测到的表层土SDθ（）的分散性可通过季节和事件尺度SDθ（）动力学来解释，可能涉及两个时间尺度的滞后。事件尺度上的滞后SDθ（）动态仅在中等土壤水分条件下产生，强烈降水迅速润湿表层土壤，增加云杉穿透雨模式控制的土壤水分变异性。这种滞后效应随着降水量的增加、根系吸水量的减少和地下水位的升高而增加。干旱表土上的强降水突然增加SDθ，但仅略微增加平均土壤水分。这是由于不同的土壤再湿润行为在干燥的上坡地区（疏水性和优先流造成轻微的表土补给）相比，适度潮湿的谷底（表土储水），这导致了一个更有组织的空间格局。研究表明，由无线传感器网络监测的土壤水分空间格局随深度、土壤含水量、季节性和单一干湿事件而变化。这是由多种因素控制的，包括土壤性质，地形，气象强迫，植被和地下水。
Our understanding of short‐ and long‐term dynamics of spatial soil moisture patterns is limited due to measurement constraints. Using new highly detailed data, this research aims to examine seasonal and event‐scale spatial soil moisture dynamics in the topsoil and subsoil of the small spruce‐covered Wüstebach catchment, Germany. To accomplish this, univariate and geo‐statistical analyses were performed for a 1 year long 4‐D data set obtained with the wireless sensor network SoilNet. We found large variations in spatial soil moisture patterns in the topsoil, mostly related to meteorological forcing. In the subsoil, temporal dynamics were diminished due to soil water redistribution processes and root water uptake. Topsoil range generally increased with decreasing soil moisture. The relationship between the spatial standard deviation of the topsoil soil moisture (SDθ) and mean water content ( ) showed a convex shape, as has often been found in humid temperate climate conditions. Observed scatter in topsoil SDθ( ) was explained by seasonal and event‐scale SDθ( ) dynamics, possibly involving hysteresis at both time scales. Clockwise hysteretic SDθ( ) dynamics at the event scale were generated under moderate soil moisture conditions only for intense precipitation that rapidly wetted the topsoil and increased soil moisture variability controlled by spruce throughfall patterns. This hysteretic effect increased with increasing precipitation, reduced root water uptake, and high groundwater level. Intense precipitation on dry topsoil abruptly increased SDθbut only marginally increased mean soil moisture. This was due to different soil rewetting behavior in drier upslope areas (hydrophobicity and preferential flow caused minor topsoil recharge) compared with the moderately wet valley bottom (topsoil water storage), which led to a more spatially organized pattern. This study showed that spatial soil moisture patterns monitored by a wireless sensor network varied with depth, soil moisture content, seasonally, and within single wetting and drying episodes. This was controlled by multiple factors including soil properties, topography, meteorological forcing, vegetation, and groundwater.
流域水文学的空间模式
DOI：
--
发表时间：
2002
期刊：
影响因子：
--
作者：
T. Meixner
通讯作者：
T. Meixner
影响因子：
8.9
作者：
BEIER, C;HANSEN, K;GUNDERSEN, P
通讯作者：
GUNDERSEN, P
影响因子：
2.8
作者：
Bogena, H. R.;Herbst, M.;Vereecken, H.
通讯作者：
Vereecken, H.