Spatio-temporal variability behavior of land surface soil water content in shrub- and grass-land
Spatio-temporal variability behavior of land surface soil water content in shrub- and grass-land
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灌丛和草地地表土壤含水量时空变异行为
DOI：
10.1016/j.geoderma.2011.02.008
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发表时间：
2011-05
期刊：
影响因子：
6.1
通讯作者：
Reichardt, Klaus
中科院分区：
文献类型：
--
作者：
Hu, Wei;Shao, Mingan;Han, Fengpeng;Reichardt, Klaus
土壤水分的空间变异性（θ）与其空间均值（θm）之间的关系对于水文模拟和理解不同尺度下的土壤水分动态具有重要意义。为了比较两种土地利用方式下的土壤水分动态和变异性，并探讨θ和θm空间变异性之间的关系，本研究分析了两种土地利用方式下的136次地面θ测量数据。在黄土高原小流域的柠条样带（KPT）和针茅样带（BNT）上，结果表明，两种土地利用方式下土壤θ的时间变化规律相似，在BNT中，湿润期土壤相对湿润，干燥期土壤相对干燥。土壤水分在不同时期间具有一定的时间稳定性，土壤水分条件越相似的时期，土壤水分的变化规律越稳定。KPT中θ的空间变异幅度大于BNT。对于两种土地利用，θ的标准差（SD）一般随θ m的增加而增加，这种行为可以用自然对数函数很好地描述。因此，可以确定两种土地利用方式的CV与θ之间的凸关系以及最大CV（KPT为43.5%，BNT为41.0%）。地质统计学分析表明，KPT的范围（9.1 m）比BNT（15.1 m）短。块金效应、结构变异性以及总变异性随θ m的增大而增大。对于两种土地利用，空间依赖性一般随着θm的增加而增加。
The knowledge of the relationship between spatial variability of the surface soil water content (θ) and its mean across a spatial domain (θm) is crucial for hydrological modeling and understanding soil water dynamics at different scales. With the aim to compare the soil moisture dynamics and variability between the two land uses and to explore the relationship between the spatial variability ofθandθm, this study analyzed sets of surfaceθmeasurements performed with an impedance soil moisture probe, collected 136 times during a period of one year in two transects covering different land uses, i.e., korshinsk peashrub transect (KPT) and bunge needlegrass transect (BNT), in a watershed of the Loess Plateau, China. Results showed that the temporal pattern ofθbehaved similarly for the two land uses, with both relative wetter soils during wet period and relative drier soils during dry period recognized in BNT. Soil moisture tended to be temporally stable among different dates, and more stable patterns could be observed for dates with more similar soil water conditions. The magnitude of the spatial variation ofθin KPT was greater than that in BNT. For both land uses, the standard deviation (SD) ofθin general increased asθmincreased, a behavior that could be well described with a natural logarithmic function. Convex relationship ofCVandθmand the maximumCVfor both land uses (43.5% in KPT and 41.0% in BNT) can, therefore, be ascertained. Geostatistical analysis showed that the range in KPT (9.1 m) was shorter than that in BNT (15.1 m). The nugget effects, the structured variability, hence the total variability increased asθmincreased. For both land uses, the spatial dependency in general increased with increasingθm.
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影响因子：
6.4
作者：
Annie-Claude Parent;F. Anctil;L. Parent
通讯作者：
Annie-Claude Parent;F. Anctil;L. Parent
影响因子：
6.1
作者：
Schume, H;Jost, G;Katzensteiner, K
通讯作者：
Katzensteiner, K
影响因子：
2.6
作者：
Hu, Wei;Shao, Ming An;Reichardt, Klaus
通讯作者：
Reichardt, Klaus
影响因子：
6.4
作者：
A. Western;G. Blöschl
通讯作者：
A. Western;G. Blöschl
影响因子：
5.2
作者：
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通讯作者：
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