摘要
用离心机法测定了四种原状土壤不同容重下的土壤水分特征曲线实测点,从实验上获得了四种原状土壤的质量含水量、吸力和容重三者间定量关系曲面。分析了土壤的扰动性对土壤三变量关系曲面的影响,并以实测数据为基础,进一步对我们提出的一种模型进行验证,比较该模型对填装土壤和原状土壤三变量曲面的拟合情况。结果表明:土壤的扰动性使实测的土壤三变量曲面发生较大的变化。填装土和原状土的初始容重差别越大,土壤的扰动性对土壤三变量曲面的影响就越大。两处理模型参数的差异大小能很好地反映土壤扰动性对三变量关系曲面的影响。原状土壤的三变量曲面实验研究和探索有益于将变容重土壤水动力学研究拓展到田间土壤,具有一定的实践意义。
Centrifuging method was used to determine soil water characteristic curves of four Undisturbed soils different in bulk density, and through the experiment, surfaces depicting quantitative relationship between mass water content, pressure head and bulk density in the four soil samples were obtained. Based on the measured data, effects of soil disturbance on the threevariable surfaces were analyzed, a fitting model proposed by the authors was verified, and fitting results of the packed and undisturbed soils were compared. Results show that soil disturbance obviously changed the soil three-variable surfaces. The bigger the difference in initial bulk density between packed and undisturbed soils, the greater the effect of soil disturbance on the surface. The differences in model parameters between the two treatments demonstrate the effects of soil disturbance on the three-variable surfaces. The study of soil three-variable surface for undisturbed soils is sure of some practical significance in extrapolating the study of soil hydrodynamics in soils different in bulk density to field soils.
出处
《土壤学报》
CAS
CSCD
北大核心
2008年第1期50-55,共6页
Acta Pedologica Sinica
基金
国家自然科学基金项目(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
关键词
原状土壤
土壤三变量曲面
模型
Undisturbed soils
Soil three-variable surface
Model
