干旱荒漠区封育沙地土壤水分变化研究

以干旱荒漠区封育沙地为研究对象,对封育沙地植被恢复过程中的土壤水分变化进行了研究。结果表明,随着封育年限的增长,沙地60 cm以下各层的土壤含水量逐渐减少,土壤含水量由25.62~29.84 g.k-g 1减小到18.02~22.82 g.k-g 1,变异系数在37.17%~59.18%;在不同植被类型下,沙地地上部分的生物量越大,土壤含水量则越小,土壤含水量变化在8.53~44.39 g.k-g 1。披针叶黄花草地的土壤含水量(20.82 g.k-g 1)>沙蒿半灌木林地的土壤含水量(17.06 g.k-g 1)>柠条灌木林地的土壤含水量(12.52 g.k-g 1);从恢复方式看,自然恢复植被区的土壤水分含量(20.45~26.52 g.k-g 1)相对较高,而人工植被区的土壤水分含量(8.69~14.14 g.kg-1)相对较低,自然+人工恢复植被区土壤水分含量(13.62~26.93g.k-g 1)介于两者之间。

Soil Water Variation of Fencing Sandy Land in Arid Desert Area

The fenced sandy lands in desert area were choosed as studying objects.The variable regularities of soil water during the process of vegetation restoration were studied.The results showed that the soil water content below 60 cm soil layer decreased with the increase of fencing time,the soil water content decreased from 25.62~29.84 g.kg-1 to 18.02~22.82 g.kg-1 with the coefficients of variation ranging from 37.17% to 59.18%.In different vegetation types,the more biomass of up-ground vegetation,the less soil water content.The soil water contents were distinct in different vegetation types.Thermopsis lanceolate herb(20.82 g.kg-1)> Artemisia arenaria half bush(17.06 g.kg-1)> Caragana korshinkii bush(12.52 g.kg-1);the soil water in three restoration patterns:natural restoration(20.45~26.52 g.kg-1)>natural artificial restoration(13.62~ 26.93g.kg-1)>artificial restoration(8.69~14.14 g.kg-1).