Effects of terrain on soil hydrological characteristics of alpine grasslands
To make more rational use of water resources and effectively protect and restore vegetation in alpine regions,alpine grasslands under different terrains (slope aspect and position) were selected as research objects in the Liancheng National Nature Reserve of Gansu Province. The variations in soil hydrological characteristics in the 0-30 cm soil layer of alpine grasslands under the different terrains (slope aspect and slope position) were investigated. The results showed that with an increase in soil depth,the soil water content of the alpine grasslands decreased,and the soil bulk density increased under different terrain conditions. The soil water content of the shady slope was higher than that of the sunny slope,whereas the opposite was true for soil bulk density. The soil water content and soil bulk density on the lower slope were higher than those on the upper slope. Total soil porosity,capillary porosity,and non-capillary porosity showed that the shady slope was larger than the sunny slope,and the upper part of the slope was larger than the lower part of the slope. The results showed that the upper part of the shady slope was the highest. The soil water-holding capacity in different slope directions and positions was as follows:shady slope>sunny slope and upper slope>middle slope>lower slope. The initial infiltration rate (0.47-5.90 mm·min-1) was higher than the stable infiltration rate (0.08-1.36 mm·min-1) and average infiltration rate (0.09-1.54 mm·min-1). The soil permeability of alpine grasslands on different terrains was as follows:sunny slope>shady slope and upper slope>middle slope>lower slope. The terrain (slope aspect and position) of the alpine grasslands has a significant impact on the soil hydrological characteristics. Therefore,the relationship between terrain and soil hydrological characteristics should be fully considered during the ecological protection,restoration,and sustainable development of alpine grassland ecosystems in the Liancheng National Nature Reserve of Gansu Province.
soil hydrological characteristicsalpine grasslandterrainslope aspectslope positionGansu Liancheng National Nature Reserve
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