Spatio-temporal analysis of the soil water content in a mixed Norway spruce (Picea abies (L.) Karst.) -: European beech (Fagus sylvatica L.) stand
Spatio-temporal analysis of the soil water content in a mixed Norway spruce (Picea abies (L.) Karst.) -: European beech (Fagus sylvatica L.) stand
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DOI：
10.1016/s0016-7061(02)00311-7
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发表时间：
2003-03-01
期刊：
影响因子：
6.1
通讯作者：
Katzensteiner, K
中科院分区：
文献类型：
--
作者：
Schume, H;Jost, G;Katzensteiner, K
为了在林分尺度上对土壤水分含量及其变化进行有代表性的测量，必须考虑有关空间和时间变异性的信息。在挪威云杉-欧洲山毛榉混合林下奥地利州的单树和树种的影响在空间和时间上的变化的规模进行了研究。在一个0.5公顷的地块上，使用Trase 1 TDR系统，沿不同间距的正方形网格在194个样本位置沿着测量土壤体积含水量（VWC），该系统具有垂直安装在0-30 cm土壤深度上的波导。在2000年的生长季节中，以大约14天的间隔进行不连续的测量。半变异函数分析用于总结VWC在选定日期的空间变化。这些日期之间的土壤水分消耗（补给）克里格插值图比较提取（再润湿）模式树（物种）分布。在一个漫长的干燥周期在春季，物种特定的蒸腾行为被证明是变化的主要来源。中等强度的光照在中度干燥的土壤上引起再湿模式，这反映了不同的拦截效率的对比物种造成的建筑属性。在干燥的土壤上的高强度的降雨事件导致了不稳定的分布模式的水在土壤中，由于优先流在收缩裂缝，这在干燥过程中打开。在这种情况下，树结构的影响在很大程度上被覆盖。在何种程度上可以检测到一个明确的空间相关性的VWC在4至20英寸的半径内变化，这取决于VWC以及干燥和再润湿的历史。(C)2002 Elsevier Science B. V.保留所有权利。
For a representative measurement of soil water content and its changes at the scale of a forest stand, information about the spatial and temporal variability has to be taken into account. The scale on which single trees and tree species influence the variation in space and time was investigated in a mixed Norway spruce-European beech stand in Lower Austria. On a 0.5 ha plot the volumetric soil water content (VWC) was measured at 194 sample locations along square grids of different spacing, using a Trase1 TDR system with waveguides installed vertically over a soil depth of 0-30 cm. Discontinuous measurements were taken in approximately 14 day intervals during the growing season of 2000. Semivariogram analysis was used to summarize the spatial variation of VWC at selected dates. Kriging interpolation plots of soil water depletion (recharge) between these dates served to compare extraction (rewetting) patterns to tree (species) distribution. During a long drying cycle in spring, species specific transpiration behaviour turned out to be the main source of variation. Light rainfalls of medium intensity on moderately dry soil caused a rewetting pattern, which reflected the different interception efficiency of the contrasted species resulting from architectural properties. Rain events of high intensity on dry soil led to an erratic distribution pattern of water in the soil due to preferential flow in shrinkage cracks, which had opened up during drying. The effect of tree architecture was largely covered in this case. The extent to which a clear spatial correlation of VWC could be detected varied within a radius of 4 to 20 in, depending on VWC as well as on the drying and rewetting history. (C) 2002 Elsevier Science B.V. All rights reserved.