Subjects: Other Disciplines >> Synthetic discipline submitted time 2023-03-28 Cooperative journals: 《中国科学院院刊》
Abstract： In this study, we systematically researched and comprehensively analyzed dominant plants in typical deserts in China, including Tarim Basin, Junggar Basin, Horqin Sandy land, and Hunshandak Sandy land, and revealed the characteristics of stress adaptation and stable restoration of dominant vegetation, and proposed the sustainable management technology of vegetation. The results are shown as the followings. (1) Desert plant roots remain connected to underground diving or soil capillary water. It is of great significance to maintain reasonable ecological water use and stable groundwater table for the restoration and conservation of dominant woody plants in these regions. (2) The shallow soil water formed by groundwater, snowmelt, and rainfall is the main water source of Haloxylon ammodendron (C. A. Mey.). It is of great significance for the restoration and conservation of H. ammodendron to make full use of the natural law of seasonal change of precipitation and the renewal of H. ammodendron to form scientific and reasonable planting technical measures. (3) Closure protection plays an important role in the stable restoration of dominant vegetation in desert (sandy land). The results can provide scientific basis and technical supports for the restoration and optimal management of dominant vegetation in the oasis-desert transition zone in arid region.
Subjects: Geosciences >> Geology submitted time 2022-12-20 Cooperative journals: 《干旱区研究》
Abstract：
Blowout is an important manifestation of grassland desertification that is a common for a wind erosion landform in sandy grassland and is highly destructive to grassland vegetation. The blowouts that were in the active development stage of HulunBuir grassland were the object of this research, and the surrounding grassland was the control in which the soil moisture was measured in different locations and different depth. The results show the following: (1) Blowouts caused the“crevasse”effect of soil moisture in grassland that lead to a significant decrease in the soil of the surrounding grassland in a range of nearly 20 m. A close proximity to the pit results in lower soil moisture, A“dry zone”was formed in the range of 0-3 m at the edge of the pit, and the soil moisture was reduced by 45.15% compared with the control. (2) Soil moisture of the pit decreased by 44.44%, and no significant difference was observed in the soil moisture between the surrounding sand accumulation area and the lightly overlying sand area compared to the control. (3) There was a great difference in soil moisture of the pit in the soil layers and sand accumulation area. Cv could reach more than 50%. As soil depth increased, the soil moisture increased first and then decreased. (4) The sand accumulation area of blowouts could realize a certain“water storage”effect after the rainy season, the pit and edge zone had a serious“water loss”effect. The soil was extremely dry soil provided conditions for the expansion and morphological development of blowouts.
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