基于氢氧稳定同位素特征的潜水蒸发影响程度研究

doi:10.13866/j.azr.2022.06.09

Abstract

Abstract:

The arid oasis area plays an important role in ecological protection and water conservation in Xinjiang. The groundwater in the area provides precious freshwater resources and is the main source of water for plants. It is important to study soil water transport, the relationship between soil water and groundwater transformation, and plant water in arid oasis areas, by studying the influencing degree of phreatic evaporation. To study the soil profile characteristics of typical vegetation growing areas, such as Populus euphratica and Tamarix ramosissima, in arid oasis area of the lower reaches of the Tarim River, environmental isotope, soil physical, and chemical analysis methods were used in this paper. The results showed that there are strong phreatic evapotranspiration and capillarity in the lower reaches of the Tarim River. It greatly influences the fractionation of hydrogen and oxygen isotopes, soil moisture content, and soil salinity. From the diving face up, as height increases, the stable isotope values of hydrogen and oxygen in soil water decreased gradually and reached a minimum value at 1-1.5 m and then gradually increased. Gradually, the soil moisture content decreases, and the rate of decrease slows down at 1-1.5 m. The soil salinity generally remains stable near the water table, and the salt content gradually increases at 1-1.5 m. Integrate soil profile data of different vegetation growing areas, the influence depth of phreatic evapotranspiration is 1-1.5 m in autumn. Using the fractionation characteristics of hydrogen and oxygen isotopes to study the phreatic capillary height and evaporation depth in arid oasis areas, it is possible to get the information that traditional hydrogeology and phreatic evaporation experiments cannot get. In the next step, it is necessary to summarize the water-salt transport law and its movement model under different evapotranspiration conditions.

Key words: capillary height, influence depth of phreatic evaporation, hydrogen and oxygen isotopes, arid oasis area, Xinjiang

JIANG Lei,ZHAO Yi,ZHANG Pengwei,HE Liang,BAI Xiang. Study on influence degree of phreatic evaporation based on hydrogen and oxygen isotope characteristics[J].Arid Zone Research, 2022, 39(6): 1793-1800.

Figures/Tables 5

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Study on influence degree of phreatic evaporation based on hydrogen and oxygen isotope characteristics

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