土壤持水特征测定中质量含水量、吸力和容重三者间定量关系Ⅰ. 填装土壤
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* 国家自然科学基金项目(批准号40371060);湖南省自然科学基金项目(06JJ3020);湖南省教育厅资助科研项目(06C500)资助


QUANTITATIVE RELATIONSHIP BETWEEN MASS WATER CONTENT, PRESSURE HEAD AND BULK DENSITY IN DETERMINATION OF SOIL WATER RETENTION CHARACTERISTICS Ⅰ. PACKED SOILS
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    摘要:

    在试验过程中,通常采用一个土样进行连续试验来测定土壤的持水特征。此时,土样的有机质、黏粒矿物类型和阳离子交换量等性质基本保持不变,而土壤的容重在水力学和机械压力共同作用下会发生很大的变化。因此,我们认为实测的土壤持水特征不再是土壤吸力和含水量相对应的一条曲线,而是由土壤质量含水量、吸力和容重三变量共同确定的一个曲面。本文在Brooks-Corey土壤水分特征曲线模型的基础上,提出了两种描述土壤质量含水量、吸力和容重三变量关系的曲面模型,分析了模型的优缺点和适用条件,并采用离心机石蜡控容重法实测了四种质地填装土壤的三变量特征曲面。研究结果表明:土壤持水特征是由土壤质量含水量、吸力和容重三变量共同确定的一个曲面这一假设是合理的;类似于Brooks-Corey模型的两种幂函数经验曲面模型能够合理地描述填装土壤的实测数据,决定系数均大于0.94;模型Ⅰ的拟合效果略好于模型Ⅱ,但模型Ⅱ包含两个物理意义明确的参数,具有一定的优势。这一研究将为校正容重变化对土壤水力学参数的影响提供新的途径。

    Abstract:

    Generally,in an experiment oriented to determine soil water retention characteristics,just one soil sample is used continuously.During the experiment,the soil would not change much in organic mater content,clay mineral type and cation exchange capacity,but would in bulk density because of hydraulic and mechanical pressures in combination.Therefore a hypothesis is put forth that soil water retention characteristic should be a surface consisting of mass water content,pressure head and bulk density instead of a curve of two variables,pressure head and water content.In this study,two models to fit soil three-variable characteristic surfaces of different soils were proposed based on the Brooks-Corey soil water retention curve model.Ad-vantages,disadvantages and application conditions of the two were illuminated.In addition,soil three-variable surfaces measured for packed soil samples through centrifuging and controlling bulk density using paraffin material were used to verify the proposed models.Results show that the hypothesis of three-variable characteristic surface is reasonable.The two proposed models based on the Brooks-Corey power function fit the measured data well with determination coefficients being greater than 0.94.Although Model Ⅰ performed a bit better than Model Ⅱ,the latter Ⅱ seems to be superior in application because it contains two additional parameters with definite physical meaning.The findings of this research could be cited as a new method in verifying the effect of bulk density on soil hydraulic parameters.

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邵明安,吕殿青,付晓莉,王全九,刘春平.土壤持水特征测定中质量含水量、吸力和容重三者间定量关系Ⅰ. 填装土壤[J].土壤学报,2007,44(6):1004-1009. DOI:10.11766/trxb200610200606 Shao Ming'an, L&#; Dianqing, Fu Xiaoli, Wang Quanjiu, Liu Chunping. QUANTITATIVE RELATIONSHIP BETWEEN MASS WATER CONTENT, PRESSURE HEAD AND BULK DENSITY IN DETERMINATION OF SOIL WATER RETENTION CHARACTERISTICS Ⅰ. PACKED SOILS[J]. Acta Pedologica Sinica,2007,44(6):1004-1009.

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  • 收稿日期:2006-10-20
  • 最后修改日期:2007-02-04
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  • 在线发布日期: 2013-02-25
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