东北地区几种主要土壤持水特性的研究

STUDY ON WATER RETENTING CHARACTERISTICS OF SEVERAL MAJOR SOILS IN NORTHEAST CHINA

我们初步研究东北地区四种主要土壤持水性能。从四种土壤保持水性能及供水性能来看,黑钙土供水能力最强,黑土的保水性能居首位。黑土的全有效水为17.92～18.72%,无效水为19.54～20.08%;黑钙土的全有效水为25.19～27.26%,无效水为13.63～14.28%;棕壤及褐土的有效水值介于二者之间。四种土壤水容量表现为土壤由高势能向低势能变动中,水容量由10^(-1)降至10^(-3)～10^(-4)数量级。

We studied the water retaining capacity of four soils(brown soil, drab soil,black soil and black calcareous soil)in Northeast China.Among the four soils,black calcareous soil had the greatest water-supplying capacity,while black soil,the greatest waterretaining ability.The total available water in black soil and black calcareous soil were 17.92～18.72%, 25.19～27.26% respectively,and the unavailable water,13.63～14.28%, 19.54～20.08% respectively,with brown soil and drab soil standing bet- ween the two in available water content.In all four types of soil there was a tendency of soil water moving from high potential to low,with water capacity diminishing from 10^(-1)to 10^(-3)or 10^(-4)in magnitude.