A new model to analyze water retention characteristics of forest soils based on soil pore radius distribution
A new model to analyze water retention characteristics of forest soils based on soil pore radius distribution
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基于土壤孔隙半径分布的森林土壤保水特性分析新模型
DOI：
10.1007/bf02348255
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发表时间：
1997
影响因子：
1.5
通讯作者：
K. Kosugi
中科院分区：
文献类型：
--
作者：
K. Kosugi
对小杉提出的土壤水分保持模型进行了修正，使其具有相对简单的函数形式。由此产生的水分保持模型（对数正态分布模型）包含两个参数，这两个参数在水分保持曲线上具有物理意义，并且与土壤孔隙半径分布函数g（r）的统计直接相关。采用对数正态分布模型对282个取自真下的原状森林土壤的观测持水数据集进行了分析，结果表明，该模型对每个数据集都表现得相当好。模型参数的估计表明，原状森林土壤的持水特性与土壤结构的关系比与土壤质地的关系更密切。许多碎屑结构森林土壤比碎屑和颗粒结构土壤具有更大的g（r）中值。扰动壤土的g（r）中值比许多未扰动森林土壤小，扰动桑迪土的g（r）宽度比森林土壤小。取自A层的棕色森林土一般比取自B层的棕色森林土具有更大的g（r）中值。某些棕色森林土的g（r）宽度大于黑土。A层棕色森林土g（r）的中位数一般随土壤水分条件变湿而变大。
The soil water retention model proposed by Kosugi was modified to have a relatively simple functional form. The resulting water retention model (the lognormal distribution model) contains two parameters which have physical significance on the water retention curve and are related directly to the statistics of the soil pore radius distribution functiong(r). The observed retention data sets of 282 undisturbed forest soils taken from Mashimo were analyzed using the lognormal distribution model, and it was shown that the model performs fairly well for every data set. The estimated parameters of the model indicated that the water retention characteristics of the undisturbed forest soils are related to the soil structure more closely than to the soil texture. Many crumb-structure forest soils have greater median ofg(r)than the crumb and granular-structure soils. Disturbed loamy soils have smaller median ofg(r)than many of the undisturbed forest soils and disturbed sandy soils have smallerg(r)width than the forest soils. The brown forest soils taken from A-horizon generally have the greater median ofg(r)than the brown forest soils taken from B-horizon. Some of the brown forest soils have the greater width ofg(r)than the black soils. The median ofg(r)of brown forest soil taken from A-horizon generally becomes greater as the soil moisture condition becomes wet.