毛乌素沙地不同沙丘部位几种灌木地土壤水分动态

Soil moisture characteristics of several types of shrubs in different anchored dune positions in Maowusu sandy land

土壤水分是制约沙漠植物生长的主要因素之一,地形部位对土壤水分影响较大,以毛乌素沙地固定沙丘3种灌木地为研究对象,分析其不同沙丘部位下各层次土壤水分的变化,并采用Brown-Forsythe检验方法分析不同沙丘部位之间土壤水分含量的差异。结果表明,沙地柏土壤体积含水量为0.97%～17.66%,油蒿土壤体积含水量为1.51%～15.70%,杨柴土壤体积含水量为3.20%～19.05%。表土层土壤水分含量较高,心土层土壤水分含量最低。表土层中丘顶、迎风坡中部、迎风坡下部与背风坡中部差异显著(P值分别为0.04,0.045,0.03),说明地形部位对表土层壤水分含量影响较大,背风坡水分含量高于迎风坡,因此栽植植物时可选择在背风坡栽植,以便于植物成活。

Soil moisture is one of the main factors that affect the plant growth, and the topography has a great effect on soil water. The paper took three types of shrubs as the objects to analyze the, soil moisture of different layers in different sand dune positions, and the difference among them were tested by Brown-Forsythe method. The results showed that the soil moisture of Sabina vulgaris was between 0.97% and 17.66% , the soil moisture of Artemisia ordosica was between 1.51% and 15.70%, the soil moisture of Hedysarum mongolicum is between 3.20% and 19.05%. The soil moisture was higher in top soil layer than that in other soil layers, and the soil moisture was the lowest in the middle layer. There were significant differences among different positions in top soil layers （value of P was 0.04, 0.045, and 0.03, respectively）, which meant sand dune positions had significant effects on soil moisture in top layer. The soil moisture content on leeward slope was much bigger than that on windward slope. Therefore, trees and shrubs should be planted in the leeward areas to grow better.