Temporal stability of soil water content for a shallow and deep soil profile at a small catchment scale
Temporal stability of soil water content for a shallow and deep soil profile at a small catchment scale
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小流域尺度浅层和深层土壤剖面土壤含水量的时间稳定性
DOI：
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发表时间：
2012-07
影响因子：
--
通讯作者：
Yu Shuang'en
中科院分区：
文献类型：
--
作者：
She Dongli;Liu Yingying;Shao Ming'an;Luis Carlos Timm;Yu Shuang'en
土壤水分的区域估算是水文过程研究的重要内容之一。其中一个挑战是制定抽样战略，以确定大面积的平均SWC的时间和金钱的成本最低。在本文中，我们使用时间稳定性的概念，适用于一个集水区斑块镶嵌景观格局，测试存在的某些样品的位置，始终表现出平均行为，无论在浅层和深层土壤湿度。利用黄土高原东沟小流域0.66 km ~ 2试验区70个样点的土壤水特征资料，研究了雨季0-20 cm和0-120 cm土层土壤水特征的时间稳定性。采用累积频数分布、斯皮尔曼秩相关系数（rs）、平均相对差（delta）和Pearson相关分析4种方法进行时间稳定性分析。整个流域的SWC的空间格局一般在时间上是不稳定的，但一些网站的时间稳定。rs空间格局的时间稳定性随平均SWC的增加而降低。0-20 cm和0-120 cm土层的rs值最低，分别为0.508和0.812。最低的rs值发生在干燥和潮湿的条件之间的过渡期，当配置文件被充电显着。0-120 cm土层的δ（sigma（delta））标准差为4.6%~ 34.8%，低于浅层土壤。同时，0-20 cm土层中只有8个样点的sigma（delta）值小于10%，而0-120 cm土层中只有32个样点的sigma（delta）值小于10%，说明深层土壤SWC的时间稳定性较强。选择的流域平均土壤含水量监测点位于草地或牧草的土地利用。基于土地利用与三角洲（%）和西格玛（三角洲）的空间分布之间的高度显着的相关性，土地利用可能是一个方便的标准，定位SWC测量位置的字段均值或极值估计。
Areal estimation of soil water content (SWC) from point measurements is important to characterize hydrological processes. One of the challenges is to develop sampling strategies for determining mean SWC of large areas with the minimum cost in time and money. In this paper, we use the concept of temporal stability, applied to a catchment with plaque mosaic landscape pattern, to test the existence of certain sample locations which consistently show mean behavior irrespective of soil wetness in the shallow and deep soil layers. Data from 70 sites in an experimental catchment of 0.66 km2 (Donggou catchment), on the Loess Plateau, China, were used to examine temporal stability of SWC for the 0-20 cm and 0-120 cm soil layers during a rainy season. Temporal stability analysis were conducted using four methods including cumulative frequency distributions, Spearman rank correlation coefficient (rs), mean relative differences (delta) and Pearson's correlation analysis. The spatial pattern of SWC across the entire catchment was generally temporally unstable, but a few sites were temporal stable. The temporal stability of spatial pattern indicated by rs decreased with increasing mean SWC. The lowest rs values were 0.508 and 0.812 respectively for 0-20 cm and 0-120 cm soil layers. The lowest rs values occurred during the transition periods between dry and wet conditions, when the profile was recharged markedly. The standard deviation of delta (sigma(delta)) ranged from 4.6% to 34.8% for 0-120 cm soil layer, lower than that of the shallow soil profile. Meanwhile, only 8 out of 70 sites for 0-20 cm soil layer but 32 sites for 0-120 cm soil depth had sigma (delta) lower than 10%, which indicated greater temporal stability of SWC of the deeper soil layer. The selected catchment average SWC monitoring locations were situated in land use of grassland or forage. Based on the highly significant correlation between the land use and both the spatial distributions of delta (%) and sigma (delta), land use may be a convenient criterion for locating SWC measurement locations for field mean or extremes estimation.
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影响因子：
3.2
作者：
J. Olley;G. Caitcheon
通讯作者：
J. Olley;G. Caitcheon
影响因子：
6.2
作者：
Fu, BJ;Chen, LD;Wang, J
通讯作者：
Wang, J
影响因子：
6.1
作者：
R. Simonson
通讯作者：
R. Simonson
影响因子：
2.9
作者：
Martínez-Fernández, J;Ceballos, A
通讯作者：
Ceballos, A
影响因子：
6.1
作者：
V. Comegna;A. Basile
通讯作者：
V. Comegna;A. Basile