经济林下土壤水分和土壤结构动态变化的研究

Dynamics of Soil Water Contents and Its Physical Features Under Fruit Trees

对大田和保护地栽培的凯特杏、油桃 ,以及农田的土壤水分和土壤结构动态进行了研究。在 3～ 5月期间 ,各类型的土壤含水量随气温升高趋于下降 ,其中各土壤层次之间以中层最高 ,上层次之 ,下层最低 ;土壤结构变化中 ,容重随深度的增加而增加 ,毛管孔隙度、总孔隙度、毛管持水量、田间持水量均随深度的增加而呈递减趋势 ;对土壤含水量与土壤结构与经济林需水量的关系也进行了探讨 ,对经济林的合理经营有一定的指导意义。

The dynamics of soil water contents and its physical features were studied for Kaite apricot and Wuyuehuo nectarine inside and outside plastic greenhouse. During the period of March and May, generally soil water contents inclined to decrease with temperature increasing, and among all the types of soils, the middle soil showed the highest in water content, then the upper soil and the lower soil in turn. The soil bulk densities inclined to decrease with the soil depth,while capillary porosity, soil total porosity, capillary water capacity and field capacity showed the adverse. Furthermore, the guidance was studied for fruit forests managing to some extent, which based on the relation between soil water contents and water requirement of fruit forests.