Stochastic modeling of soil salinity
Stochastic modeling of soil salinity
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DOI：
10.1029/2010gl042495
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发表时间：
2010-04
影响因子：
5.2
通讯作者：
Samir Suweis;Andrea Rinaldo;Andrea Rinaldo;S. V. D. Zee;Edoardo Daly;Edoardo Daly;A. Maritan;A. Porporato;A. Porporato
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文献类型：
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作者：
Samir Suweis;Andrea Rinaldo;Andrea Rinaldo;S. V. D. Zee;Edoardo Daly;Edoardo Daly;A. Maritan;A. Porporato;A. Porporato
提出了一个土壤原生盐分的最小随机模型，该模型中土壤盐渍化速率由干湿盐沉降平衡和降雨引起的间歇性淋溶事件决定。通过将耦合的土壤水盐质量平衡方程简化为一个由乘性泊松噪声驱动的随机微分方程，得到了盐质量和浓度的长期概率密度函数。新的分析解决方案提供了对长期土壤盐渍化的主要土壤，植物和气候参数之间相互作用的见解。特别是，他们表明存在两个不同的制度，一个是平均盐质量保持几乎不变（或减少），随着降雨频率的增加，和另一个平均盐含量显着增加，随着降雨频率。因此，在干旱气候中，降雨量相对较小的减少可能会导致长期土壤盐渍化趋势的急剧变化，从而产生重大后果，例如气候变化对雨养农业的影响。
A minimalist stochastic model of primary soil salinity is proposed, in which the rate of soil salinization is determined by the balance between dry and wet salt deposition and the intermittent leaching events caused by rainfall events. The long term probability density functions of salt mass and concentration are found by reducing the coupled soil moisture and salt mass balance equation to a single stochastic differential equation driven by multiplicative Poisson noise. The novel analytical solutions provide insight on the interplay of the main soil, plant and climate parameters responsible for long‐term soil salinization. In particular, they show the existence of two distinct regimes, one where the mean salt mass remains nearly constant (or decreases) with increasing rainfall frequency, and another where mean salt content increases markedly with increasing rainfall frequency. As a result, relatively small reductions of rainfall in drier climates may entail dramatic shifts in long‐term soil salinization trends, with significant consequences e.g. for climate change impacts on rain‐fed agriculture.