Spatial-temporal variability of soil water content in a cropland-shelterbelt-desert site in an arid inland river basin of Northwest China
Spatial-temporal variability of soil water content in a cropland-shelterbelt-desert site in an arid inland river basin of Northwest China
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DOI：
10.1016/j.jhydrol.2016.07.005
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发表时间：
2016-09
影响因子：
6.4
通讯作者：
Fu Bojie
中科院分区：
文献类型：
--
作者：
Shen Qin;Gao Guangyao;Hu Wei;Fu Bojie
了解土壤水分的时空变异性是理解一系列水文过程的关键。本文以黑河流域中部绿洲-荒漠交错带农田-防护林-荒漠样地为研究对象，研究了土壤含水量的空间变异性和时间稳定性。在2012年至2013年的两个生长季节期间，在45个地点对65次深度为2.8 m的SWC进行了测量。SWC与平均SWC的标准差表现出一个凸向上的关系，在防护林的SWC的最大的空间变化为22.0%左右，而线性增加的关系，观察农田，沙漠和土地利用模式。土地利用类型的相对差标准差与土壤含水量呈线性正相关（p< 0.05），而三种土地利用类型的相关性不明显。土壤水碳空间格局的时间稳定性最强的是土地利用方式，其次是荒漠、防护林和农田。不同土层土壤含水量的空间格局差异显著。土壤含水量随深度的变化而变化，由于土壤质地、根系分布和灌溉管理的不同，没有一个位置能代表整个土壤剖面。各土层的代表性位置可以很好地估计土壤水稳性。SWC的时间稳定性的统计数据，可以同样很好地与低频率的观察（30天的间隔）与高频率（5天的间隔）。取样频率对土壤含水量代表点的选择影响不大。该研究为干旱内陆河流域绿洲-荒漠交错带SWC采样的最佳策略设计提供了有用的信息。
Knowledge of the spatial-temporal variability of soil water content (SWC) is critical for understanding a range of hydrological processes. In this study, the spatial variance and temporal stability of SWC were investigated in a cropland-shelterbelt-desert site at the oasis-desert ecotone in the middle of the Heihe River Basin, China. The SWC was measured on 65 occasions to a depth of 2.8 m at 45 locations during two growing seasons from 2012 to 2013. The standard deviation of the SWC versus the mean SWC exhibited a convex upward relationship in the shelterbelt with the greatest spatial variation at the SWC of around 22.0%, whereas a linearly increasing relationship was observed for the cropland, desert, and land use pattern. The standard deviation of the relative difference was positively linearly correlated with the SWC (p< 0.05) for the land use pattern, whereas such a relationship was not found in the three land use types. The spatial pattern of the SWC was more time stable for the land use pattern, followed by desert, shelterbelt, and cropland. The spatial pattern of SWC changed dramatically among different soil layers. The locations representing the mean SWC varied with the depth, and no location could represent the whole soil profile due to different soil texture, root distribution and irrigation management. The representative locations of each soil layer could be used to estimate the mean SWC well. The statistics of temporal stability of the SWC could be presented equally well with a low frequency of observation (30-day interval) as with a high frequency (5-day interval). Sampling frequency had little effect on the selection of the representative locations of the field mean SWC. This study provides useful information for designing the optimal strategy for sampling SWC at the oasis-desert ecotone in the arid inland river basin.
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