| 花岗岩风化土物理特征曲线间的相关性研究 |
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| 引用本文： | 夏金文,魏玉杰,蔡崇法.花岗岩风化土物理特征曲线间的相关性研究[J].土壤学报,2017,54(3):581-589. |
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| 作者姓名： | 夏金文 魏玉杰 蔡崇法 |
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| 作者单位： | 华中农业大学资源与环境学院,武汉,430070 |
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| 基金项目： | 国家科技支撑计划项目(2011BAD31B04)资助 |
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| 摘 要： | 花岗岩风化壳水分及收缩特性的研究是花岗岩土体稳定性评价及侵蚀机理研究的基础。通过Van Genuchten(VG)模型对不同风化程度的花岗岩土壤的颗粒累积分布、土水特征曲线和收缩特征曲线进行拟合,分析曲线拟合参数间以及这些参数与基本物理性质间的线性及非线性相关关系。结果表明:VG模型可以很好地用于不同风化程度花岗岩风化土的颗粒组成、土水特征与收缩特征的拟合与预测;曲线拟合参数间具有一定的线性相关关系;曲线拟合参数与基本物理性质间具有一定的线性相关关系,其中土水特征曲线参数与土壤质地以及容重线性相关性较高,收缩特征曲线物理参数与基本物理性质间的线性相关性较收缩特征曲线其他参数高。此外,曲线拟合参数间以及这些参数与基本物理性质间具有一定的非线性相关关系,而关系多为二次、三次非线性相关。根据花岗岩风化土颗粒组成状况及其基本物理性质对其水分特征曲线及收缩特征曲线进行预测具有一定的可行性。
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| 关 键 词： | 花岗岩 颗粒分布 土水特征曲线 收缩特征曲线 VanGenuchten模型 |
| 收稿时间： | 2016/4/26 0:00:00 |
| 修稿时间： | 2016/11/9 0:00:00 |
Correlations between Characteristic Curves of Physical Properties of Weathered Granite Soils |
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| XIA Jinwen,WEI Yujie and CAI Chongfa.Correlations between Characteristic Curves of Physical Properties of Weathered Granite Soils[J].Acta Pedologica Sinica,2017,54(3):581-589. |
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| Authors: | XIA Jinwen WEI Yujie and CAI Chongfa |
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| Institution: | HuaZhong Agricultural University,HuaZhong Agricultural University,HuaZhong Agricultural University |
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| Abstract: | Objective]Researches on moisture content and contraction characteristics of weathering crust of granite are the basis for evaluation of stability of granite soil and studies on erosion mechanism of the soil. However,direct measurement of the two parameters is very tedious,time consuming,and errors prone. Therefore,a number of indirect measuring methods have been developed to predict soil water retention curves by means of determining particle-size distribution,but most of these methods often yield intermittent soil moisture characteristic data because they are only capable of predicting soil moisture characteristic at individuals points along the curves. It is,therefore,essential to explore for a new method to plot characteristic curves of soil water content and contraction of weathering crust of granite. For that end,it is a first priority to understand relationships between soil moisture retention curve,contraction characteristic curve and particle-size distribution curve,as well as relationships between all the three curves and physical properties of the soil. Method]To comprehensively understand the relationships,soil samples different in weathering degree were collected from Southeast Hubei for analysis. Based on the similarity of the soil water retention curves,contraction characteristic curves and particle-size distribution curves,the Van Genuchten(VG)model was used to fit the curves of the soil samples different in weathering degree and explore fitting parameters of the curves and linear and non-linear correlations of the fitting parameters with soil physical properties. Result] Results show that,the VG model may well fit all the three curves of granite soils different in weathering degree. Certain linear relationships were found between the fitting parameters,particularly between parameter α1 of the particle-size distribution curves and parameter θS of soil water retention curves(r=-0.884,p<0.05)and but highly significant negative linear ones were between α1 and parameter vr of the contraction characteristic curves(r=-0.990,p<0.01);Meanwhile, certain linear relationships were also found between the curve fitting parameters and basic soil physical properties,especially those of the parameters of water retention curves with soil texture and bulk density. And the linear relationships of parameters vr and vs of the contraction characteristic curves with basic soil properties were closer than those of all the others;Besides non-linear relationships also exsited between fitting parameters of these curves and between the parameters and basic soil physical properties. Significant quadratic nonlinear relationships were found of parameter α2 of the water retention curves with the clay and parameter α1 of the particle-size distribution curves,while significant cubic ones were between parameter α3 of the contraction characteristic curves and sand,and between parameter vs of the contraction characteristic curves and parameter n1 of the particle-size distribution curves. Conclusion] In this paper,the VG model was used to fit paricle-size distribution,soil moisture content and contraction characteritics of granite soils different in weathering degree and analyze linear and non-linear relationships between soil water retention curves,contraction characteristic curves and particle-size distribution curves,between fitting parameters of the three types of curves and between the fitting parameters and basic physical properties of the soil. All the findings will certainly be useful to future study on relationships between the three types of curves and have demonstrated that it is feasible to predict soil moisture content and contraction characteristics of granite soils based on their particle-size distribution and physical properties. |
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| Keywords: | Granite Particle-size distribution Soil water retention curve Soil contraction characteristic curve Van Genuchten model |
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