短花针茅草原建群植物根部土壤含水量对放牧强度的响应

A Study on Response of Soil Water Content Near the Roots of Constructive Plants to Grazing Intensity in Stipa Breviflora Steppe

在短花针茅草原上研究建群植物根部土壤含水量对放牧强度的响应。结果表明:放牧强度的不同导致主要建群植物根部土壤含水量存在一定差异。短花针茅根部土壤含水量在轻度放牧区0～10cm土层较高,围封区10～20cm土层较高,中度和重度放牧区20～30cm土层较高;无芒隐子草根部土壤含水量在围封、轻度放牧区10～30cm土层较高,中度和重度放牧区0～10cm土层较高;冷蒿根部土壤含水量在围封区、轻度放牧区20～30cm土层较高,中度、重度放牧区0～20cm土壤水分较高。

The influence of grazing intensity on soil water content near the roots of constructive plants in Stipa breviflora steppe was studied in this paper. The results showed that: the difference of grazing intensity results in the difference of soil water content near the roots of the constructive plants. The soil water content near the roots of the Stipa breviflora was higher in the 0 ~ 10cm soil layer in the lower stocking rate plots, in the 10 ~ 20 cm soil layer in the enclosed plots, and higher in the 20 ~ 30 cm soil layer in the moderate and higher stocking rate plots. The soil water content near the roots of the Cleistogenes songorica was higher in the 10 ?30cm soil layer in the lower stocking rate plots and enclosed plots, in the 0 ~ 10 cm soil layer in the moderate and higher stocki ng rate plots. The soil water con tent n ear the roots of the Fringed Sagebrush was higher in the 20 ~ 30cm soil layer in the enclosed plots and lower stocking rate plots, in the 0 ~ 20 cm soil layer in the moderate and stocking rate plots.