白浆土水分状况及其调节

白浆土的形成与发展过程——白浆化过程,是在土壤水分直接参与下进行的.白浆土的水分状况有它独具的特点.因此,研究白浆土水分的贮存、移动、平衡与消耗的变化规律,对了解白浆土的形成,发展农业生产,特别是进行机械化耕作,有着重要的意义.我们自1958年在完达山北部地区开始探讨白浆土水分变化规律,现将白浆土的水分观测资料整理分析如下,以供有关方面参考.

MOISTURE REGIME OF PLANOSOL (A BLEACHED SOIL) AND ITS ADJUSTMENTS

The precipitation is known as the main source of water for the planosol (a bleached soil). According to the nature of the soil moisture regime,the annual moisture cycle of the planosol may be divided into two periods,i. e. the frozen period and the crop growth period at summer and autumn. These two periods can be also subdivided into five phases. The former period involves two phases:the freezing and thawing of the sail,while the latter period contains three phases:lower moisture in early-summer;an excess of soil water in mid-siunmer and a humid soil condition in late-autumn.