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首页> 外文期刊>Geophysical Research Letters >A possible mechanism for soil moisture bimodality in humid-land environments
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A possible mechanism for soil moisture bimodality in humid-land environments

机译：湿地环境中土壤水分双峰性的可能机制

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摘要

The origin and causes for the existence of two distinct steady-state modes of soil moisture probability distribution (pdf) have been attributed to several processes, such as land-atmosphere feedbacks or shifts in climatic conditions within seasons. Here we argue that the interaction between saturated and unsaturated zones in soils with shallow water tables might represent a possible mechanism leading to such bimodality. This conclusion is achieved by analyzing soil water content measurements in vegetated soil columns artificially constructed in a laboratory. We used these observations to develop a stochastic model for the daily soil water balance, which shows how the interplay between the water table and the unsaturated zone is able to induce soil moisture bimodality.
机译：存在两种不同的土壤水分概率分布稳态模式（pdf）的起源和原因，归因于几个过程，例如陆地-大气反馈或季节内气候条件的变化。在这里，我们认为，浅层水位土壤中饱和和非饱和区之间的相互作用可能代表了导致这种双峰性的可能机制。通过分析在实验室中人工构建的植被土壤柱中的土壤含水量测量值，可以得出此结论。我们利用这些观察结果建立了每日土壤水平衡的随机模型，该模型显示了地下水位和非饱和区之间的相互作用如何能够诱发土壤水分双峰。

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