Ambiguous effects of grazing intensity on surface soil moisture: A geostatistical case study from a steppe environment in Inner Mongolia, PR China
Ambiguous effects of grazing intensity on surface soil moisture: A geostatistical case study from a steppe environment in Inner Mongolia, PR China
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DOI：
10.1016/j.jaridenv.2008.02.002
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发表时间：
2008-07-01
影响因子：
2.7
通讯作者：
Frede, H. -G.
中科院分区：
文献类型：
--
作者：
Schneider, K.;Huisman, J. A.;Frede, H. -G.
放牧强度是否会导致土壤水分分布和贮水机制的变化？我们试图回答这个问题，通过比较时间和空间的土壤水分变化与不同放牧强度的网站，从未放牧到严重放牧。本研究是在中国北方半干旱草原环境中进行的。在植物生长季节，蒸散率通常超过这些地区的降雨量，因此植物-土壤系统的蓄水能力对生物量的增长至关重要。在2005年6月，在5个放牧处理（两个未放牧的网站，一个冬季放牧，一个连续放牧和一个重放牧网站）的土壤水分的空间变化进行了监测，在连续7天后的降水事件。我们使用电容传感器来测量土壤水分体积下降到0.06米的深度。对测量结果进行了数据点空间相关性分析（变异函数分析和克里金插值）。这五个地点确实显示出一些空间格局，但这些格局并不是很明显。表层土壤的保水能力沿着放牧梯度由未放牧（最湿润）向重度放牧（最干旱）递减。然而，这一模式是不安的，因为两个未放牧的网站（自1979年以来未放牧和自1999年以来未放牧）不同的反应，以湿润和干燥，并显示出显着的差异在所有采样日。(c)2008爱思唯尔有限公司保留所有权利。
Does grazing intensity lead to changes ill the mechanisms of water distribution and water storage in the topsoil? We attempt to answer this question by comparing temporal and spatial soil moisture variation on sites with different grazing intensities ranging from ungrazed to heavily grazed. The research was carried out in it semi-arid steppe environment in northern China. During file growing season, evapotranspiration rates usually exceed the amount of rainfall ill these areas, so the ability to store water in the plant-soil system is crucial for biomass growth. In June 2005, the spatial variation of soil moisture in five grazing treatments (two ungrazed sites, one winter grazing, one continuous grazing and one heavy grazing site) was monitored on seven consecutive days after a precipitation event. We used capacitance sensors to measure volumetric soil moisture down to a depth of 0.06 m. The measurements were analysed with respect to the spatial correlation of data points (variogram analysis and kriging interpolation). The five sites did reveal some spatial patterns, but these were not very distinct. The capability of retaining water in the topsoil declined along the grazing gradient from ungrazed (wettest site) to heavily grazed (driest site). However, this pattern is disturbed, as the two ungrazed sites (ungrazed since 1979 and ungrazed since 1999) reacted differently to wetting and drying and showed significant differences on all sampling days. (c) 2008 Elsevier Ltd. All rights reserved.