根据颗粒大小分布估计土壤水分特征曲线:分形模型的应用
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* 国家自然科学基金课题(No.49971041);中国科学院南京土壤研究所所长基金课题(ISSDF0004);国家重点基础研究发展规划项目(G1999011803)


FIGURING SOIL WATER CHARACTERISTIC CURVE BASED ON PARTICLE SIZE DISTRIBUTION DATA: APPLICATION OF FRACTAL MODELS
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    摘要:

    根据UNSODA数据库和文献中的11种质地共554个样品的颗粒大小分析和水分特征曲线资料,对Tyler-Wheatcraft、Brooks-Corey和Rieu-Sposito三种分形模型在预测土壤水分特征曲线中的适用性进行了研究。结果表明,Brooks-Corey形式的分形模型预测精度高于其它两种模型。同时本文还指出了这三种模型适用的土壤质地范围,即Brooks-Corey模型对于中、粗质地的土壤预测效果好于另外两种模型,Rieu-Sposito分形模型则适用于细质地土壤,Tyler-Wheatcraft模型的预测误差界于二者之间,也适用于中、粗质地的土壤。

    Abstract:

    Soil hydraulic properties,including soil water characteristic curve and the unsaturated hydraulic conductivity function,are the key information necessary for study of water and solute movement in the vadose zone.Unfortunately,the great spatial variability and the complexity of soil make direct measurement of these properties costly,time consuming and error-prone.For a large scale application,this may be even infeasible.Hence,indirect methods,which relate more easily measured soil physical properties to hydraulic properties,have been considered valuable alternatives.In the present study,three fractal models, i.e.,Tyler-Wheatcraft,Rieu-Sposito and Brooks-Corey models are used to figure out soil water characteristic curve based on part icle size distribution data.Applicability of these models is evaluated based on the particle-size distribution and soil water characteristic curves of 554 soil samples cited from the Unsaturated Soil Hydraulic Database,UNSODA and other publications.Soil textures of these samples cover the range from sand to heavy clay,and each sample has more than six pairs of pressure-water content measurements.Goodness-of-fit between measured and est imated volumetric water content is expressed in terms of root mean squared error.Results show that,the predictive accuracy of Brooks-Corey model is higher than that of the other two fractal models.In addition,it is suggested that models should be applied to soils texture specifically.In other words,for medium- and coarse-textured soils,Brooks-Corey model is preferable,while Rieu-Sposito model is much more suitable for fine-textured soils.And Tyler-Wheatcraft model is in between the two aforementioned models in terms of estimation error.Tyler-Wheatcraft model can be used for both coarse- and medium-textured soils.

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刘建立,徐绍辉.根据颗粒大小分布估计土壤水分特征曲线:分形模型的应用[J].土壤学报,2003,40(1):46-52. DOI:10.11766/trxb200112240106 Liu Jian-li, Xu Shao-hui. FIGURING SOIL WATER CHARACTERISTIC CURVE BASED ON PARTICLE SIZE DISTRIBUTION DATA: APPLICATION OF FRACTAL MODELS[J]. Acta Pedologica Sinica,2003,40(1):46-52.

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  • 收稿日期:2001-12-24
  • 最后修改日期:2002-04-20
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  • 在线发布日期: 2013-02-25
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