Temporal persistence of spatial patterns in throughfall
Temporal persistence of spatial patterns in throughfall
复制标题
DOI：
10.1016/j.jhydrol.2005.03.021
复制
发表时间：
2005-11-25
影响因子：
6.4
通讯作者：
Weiler, M
中科院分区：
文献类型：
--
作者：
Keim, RF;Skaugset, AE;Weiler, M
森林下穿透雨的空间和时间变异性可能是土壤过程、流域水文学和生物地球化学的重要控制因素。我们使用了一套94个雨量计来测量美国太平洋西北部三个林地下穿透雨量的变异性。在中龄和老林中，穿透雨量相关的长度尺度(空间相关长度)介于1/2到1个树冠直径之间。在落叶林分中，落叶条件下的空间相关长度约为1个冠径，而落叶条件下的穿透雨在空间上没有相关性。风暴-总穿透雨量的空间模式在两个方面是时间稳定的：半方差函数提供了一种空间现象的连续性的度量，在风暴之间是相似的，并且可以相对于小区平均值来预测单个量规的穿透雨量。穿透雨量的时间稳定性图经平均值和方差归一化后，可用于比较林分间穿透雨量空间变异性的时间持续性。综合起来，半方差函数和时间稳定性图似乎是描述土壤表面水分通量的穿透雨量变异性的合适参数。(C)2005 Elsevier B.V.保留所有权利。
Spatial and temporal variability of throughfall beneath forests are potentially important controls on soil processes, watershed hydrology, and biogeochemistry. We used a set of 94 rain gauges to measure variability of throughfall beneath three forest stands in the Pacific Northwest, USA. The length scale over which throughfall amounts were correlated (spatial correlation lengths) was between one-half- and one crown diameter in mid-age and old stands of conifers. In a deciduous stand, the spatial correlation length was about one crown diameter when in leaf condition and throughfall was not correlated spatially in leaf-off condition. Spatial patterns of storm-total throughfall were temporally stable in two ways: semivariograms, which provide a measure of the continuity of a spatial phenomenon, were similar among storms, and throughfall amounts of an individual gauge could be predicted relative to the plot average. Time stability plots of throughfall amounts, normalized with respect to mean and variance, were useful for comparing temporal persistence of spatial throughfall variability among stands. Together, semivariograms and time stability plots appear to be suitable descriptors of throughfall variability for modeling water flux at the soil surface. (c) 2005 Elsevier B.V. All rights reserved.