摘要
本文研究了淮北主要耕作土壤的持水曲线、颗粒组成和微团聚体组成等物理性质,发现经验方程θ-AS^(-B)在中、低吸力段对土壤持水曲线有良好的模拟性,F检验都达到0.001的显著性水平。由此推导出比水容量为:Cθ=-(dθ/ds)=ABS^(-(B+1)),用解析法计算出各吸力值下不同土壤的比水容量,并认为AB值可作为土壤持水性能好坏的评价指标。同时尝试了以对数S型曲线的I型:拟合土壤的颗粒大小分配曲线,以Ⅱ型:N(μ_(?)σ)=(?)+b_2 lg D拟合微团聚体分布曲线,得到了较好的结果。并分析了土壤水分性质与其它物理性质的关系,以及这三个拟合方程中各参数的意义与相互关系,说明该区域土壤持水性能与颗粒组成、微团聚体有密切相关。
The water retention, texture, microaggregate composition and other physical properties of main soils in north Anhui Province were measured. It has been found that the function θ=AS^(-B) could well simulate the soil water-retention curves under condition of medium and low suction, from this the specific water capacities of these soils were derived; and then the specific water capacities were obtained by analytical solution: C_θ= -(dθ/dS)= ABS^(-(B+1)).It is suggested that A·B value might be used to evaluate soil waterretention ability. Function type I of S-shape curve (P=(1/a_2+b_2e-lgD))has been used to fit the particle distribution curve and type II(N(μ,σ)=a_3+b_3lgD) to fit the mieroaggregate distribution curve.The results obtained were satislactory.Parameters of ■hese functions and their relationship to soil water condition and othern physical properties are also discussed.
出处
《土壤学报》
CAS
CSCD
北大核心
1990年第1期34-42,共9页
Acta Pedologica Sinica
