摘要
用离心机法研究了陕西５种主要农业土壤的持水特性。结果表明，土壤持水曲线用经验方程θ＝ＡＳ－Ｂ拟合最好，土壤持水量、孔径分布和比水容量都与土壤质地密切相关，同时受孔隙状况的影响。土壤持水量和无效水含量随土壤质地变粘而增大，土壤有效水含量及比水容量以壤土高于砂性土和粘性土。土壤当量孔径的分布，以砂性土形成较大的有效水孔隙较多，细小的无效水孔隙较少，粘性土则相反。综合评定，持水力和供水力以黑垆土较强，风沙土最弱；褐土和土持水力强，但供水力较弱，而黄绵土供水力较强，持水力软弱。
The important water
holding capacity of 5 kinds of agricultural soils inShaanxi was studied using the centrifuging.
The results indiciate in the following :theempirical equation θ=AS-B is used to fit soil water
holding capacity; pore diameter dis-tribution and specific water capacity are closely related to
soil texture and affected bypore conditions. Soil water holding capacity and unavailable water
contents increase assoil texture becomes clayed.Available water contents and specific water
capacity inloam are higher than those in sandy soil and clayed soil.As to pore diameter
distributionof soil equivalent,there are more available water pores in sandy soil,but fewer fine
un-available water pores, and vice versa in clayed soil.The comprehensive evaluation
indi-cates that Heilu earth has the strong water holding capacity and water supply
capacity;sanddrift soil has the weakest water holding capacity;Brown earth and Lou earth
havethe stronger water holding capacity but poor water supply capacity;and cultivated loes-sial
soil has strong water supply capacity but weak water holding capacity.
出处
《干旱地区农业研究》
CSCD
北大核心
1994年第2期32-37,共6页
Agricultural Research in the Arid Areas
关键词
土壤持水性
土壤性质
陕西
soil water
holding curve
available water
specific water capacity
porediameter distribution
soil texture
Shaanxi Province
