陕北黄土丘陵坡地桑园土壤含水量变化浅析

Soil Water Content Variation in Mulberry Orchard on Loess Hilly Upland of Northern Shaanxi Province

选取绥德县丘陵坡地退耕栽桑试验桑园的桑地、桑-紫花苜蓿间作地和空地为研究对象,对2015-2017年桑树生长季土壤含水量进行连续观测,分析了不同时间、空间土壤含水量的变化,取得如下结果:桑地、桑-紫花苜蓿间作带及空地三种类型的浅表层土壤含水量与降雨密切相关,土壤含水量大体上表现为由表层向深层土壤逐渐减少。空地浅表层的土壤含水量略小于桑地和桑-草间作带,桑地中下层土壤含水量略低于间作带和空地,但三者间无显著差异。结论:合理密度栽植桑树和选用合理的草种进行桑-草间作有利于土壤水分的保持。

Three types of land including mulberry land,mulberry-alfafa intercropping land,and vacant land on loess hilly upland of Suide county were chosen as the research subject.The soil moisture content of these land in mulberry growing season during 2015-2017 was continuously observed,and the variation of water content at different time and space was analyzed.The results showed the water content in surface layer of the three types of land was closely related to rainfall,and the soil water content reduced with the depth of soil.The soil moisture content in surface layer of open land was slightly smaller than that of the mulberry and mulberry-alfafa intercropping land.That of the middle and lower layer of the mulberry land was slightly lower than that of the intercropping and open land,but there was no significant difference among the three.So it is concluded that rational density planting of mulberry trees and selection of reasonable intercropping are conducive to soil moisture retention.