The response of plant water use strategy to hydrological conditions in arid areas: a case study of Populus euphratica in Ejina Delta
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Abstract:
The response of plant water use strategy to hydrological conditions is important for eco-hydrological research in arid areas. In the present paper, we studied a typical riparian plant, Populus euphratica, under different hydrological conditions in Ejina delta. We simultaneously collected samples of the plants’ xylem as well as the surrounding soil and extracted their water with a cryogenic vacuum extraction system. Meanwhile, we collected river water and groundwater samples. The δ18O of these samples were tested to analyze the relationship between potential water sources (river water, groundwater), soil water, and plant water by the isotopic mass balance model. The results indicated that the Populus euphratica that stands 75 m away from riverbank with a 2-m-deep water table mainly consumes water from the 1.0-2.0-m deep soil layer and 93.7% of the plant water is from the river. The Populus euphratica that stands 2 km away from riverbank with a 3.3-m-deep water table mainly absorbs soil water that is 1.4-3.2 m deep, and ultimately 80.0% of the plant water comes from groundwater (river water that stays long in the aquifer). It can be seen that the water use strategy of Populus euphratica varies significantly with their distance from riverbank and groundwater table depth.
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