鄱阳湖典型湿地地下水—河湖水转化关系

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Abstract The characteristics of hydrogen and oxygen isotopes in rainfall, lake water, river water, and wetland groundwater were investigated in a typical delta wetland of Poyang Lake during the period from April to October in 2018. Based on the δ¹⁸O-δD relationships, the transformations between these different water sources in different hydrological periods were quantified. The contribution rates of different water bodies to wetland groundwater were further calculated using a mixed source model. The results showed that, in general, the rainfall δ¹⁸O and δD values were lower in June and July and were higher in other months of the year. The rainfall isotopes exhibit obviously seasonal variations and the associated amount effect. The variation trends of isotopes in river water and lake water were consistent with those of the rainfall. In addition, the river water and lake water were isotopic enriched due to intense evaporation, while the variation amplitudes were less than the rainfall isotopes. The results also revealed that the groundwater isotopes in wetland were relatively stable with small seasonal variations. On average, the groundwater δ¹⁸O and δD values (-5.26‰, -31.1‰) were higher than those of the rainfall (-6.32‰, -40.1‰), and were lower than those of the lake water (-3.60‰, -26.4‰), but were close to the river water (-5.09‰, -34.4‰). This result indicated that the wetland groundwater was jointly influenced by rainfall, river water and lake water. During the water level rising period (April-May), the river water was mainly recharged by the rainfall and the catchment groundwater. During this period, the lake water was mainly supplied by the rainfall and the river water, while the wetland groundwater was mainly replenished by the antecedent precipitation and the river water. However, the contribution of river water to the wetland groundwater was the greatest among these water sources. During the high water level period (June-August), the wetland groundwater was mainly recharged by lake water and the river water, and the contribution rate of lake water was higher than 50%. During the falling water period, results showed that the wetland groundwater discharged to the surrounding river channel and the lake.

Key words： stable isotope groundwater river water lake water transformation relationship Poyang Lake wetland

Received: 26 August 2020

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X524

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	XU Xiu-li
	LI Yun-liang
	TAN Zhi-qiang
	GUO Qiang

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XU Xiu-li,LI Yun-liang,TAN Zhi-qiang等. Groundwater, river water and lake water transformations in a typical wetland of Poyang Lake[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(4): 1824-1833.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I4/1824

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