黄河中游湿地优势植物水分利用的同位素研究

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Abstract Plant water source along the Yellow River is considered to be a foundation to reveal mechanisms of regional wetland evolution, due to the national strategy of ecological protection and high quality development of the Yellow River basin. This study investigated the characteristics of hydrogen and oxygen isotopes of rainfall, river water, groundwater, soil water and the xylem water for five dominant plants in the typical dry and rainy seasons during 2019, taking the Fen River estuary wetland as an example. The replenishment water sources of the Fen River wetland were explored using the relationship of δ¹⁸O and δD. The proportions of water uptake by different plants were further quantified using a direct inference method and the IsoSource mixing model. Results show that the isotope values of the wetland groundwater were much lower than those of rainfall and the Fen River. Wetland groundwater was rarely replenished by the local rainfall and mainly supplied by the Yellow River water. The shallow soil water at 0~20cm depth was mainly supplied by rainfall, while the deep soil water at 20~80cm depth was recharged by upward fluxes of groundwater and Fen River water. The proportions of plant water source were different among species. In the dry season, herbaceous plants showed niche separation of water use. The Typha minima and Calamagrostis pseudophragmites mainly used shallow soil water, while the Juncellus serotinus mainly used deep soil water and groundwater (89%±23%). The Phragmites australis mainly used the Fen River water, groundwater and deep soil water (86%±19%). However, all of the three herbaceous plants used deep soil water, groundwater and river water in the rainy season, demonstrating a niche overlap of the plant water use. Additionally, water sources of Tamarix chinensis exhibited a seasonal shift, characterizing by multiple sources in the dry season and shallow soil water (68%±5%) in the rainy season. Under future warm and dry climate conditions, T. chinensis is likely to exhibit distinctly survive advantages because of the strong plasticity of water use, while the herbaceous plants may be influenced by intense water competition. The findings of this study could provide significant scientific references for the wetland ecosystem construction in the Yellow River basin, contributing to an improved understanding of the wetland evolution mechanism.

Key words： middle reaches of the Yellow River plant water source water recharge hydrogen and oxygen isotope estuary wetland

Received: 30 March 2023

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X173

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	XU Xiu-li
	LI Yun-liang
	GUO Qiang

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XU Xiu-li,LI Yun-liang,GUO Qiang. Stable isotopes research on water sources of dominant plants in a river wetland at the middle reaches of the Yellow River[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(11): 6079-6089.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I11/6079

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