Application of Stable Isotopes in Analyzing the Water Sources of Populus euphratica and Tamarix ramosissima in the Upstream of Tarim River

doi:10.7522/j.issn.1000-694X.2015.00185

JOURNAL OF DESERT RESEARCH ›› 2017, Vol. 37 ›› Issue (1): 124-131.DOI: 10.7522/j.issn.1000-694X.2015.00185

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Application of Stable Isotopes in Analyzing the Water Sources of Populus euphratica and Tamarix ramosissima in the Upstream of Tarim River

Zhou Tianhe^1,2, Zhao Chengyi¹, Wu Guilin^1,2, Jiang Shaowei^1,2, Yu Yongxiang^1,2, Wang Dangdang^1,2

1. Key Laboratory of Oasis Ecology and Desert Environment, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China

Received:2015-10-11 Revised:2015-12-11 Online:2017-01-20 Published:2017-01-20

Abstract

Abstract: Based on the stable hydrogen and oxygen isotope compositions of the stem water from Populus euphratica and Tamarix ramosissima and potential water sources (river water, 0-300 cm soil water and groundwater) in the upstream of Tarim river ,The water source and contributions of potential water sources to total water uptake of Populus euphratica and Tamarix ramosissima were simulated by the IsoSource model. The results show that the shallow soil water in 0-100 cm was significantly affected by evaporation with higher δ¹⁸O value while the distance was farther from the river. The variation of the δ¹⁸O value of soil water in 100-300 cm and the groundwater were not significant, and were lower than shallow soil water. The δ¹⁸O value of stem water was lower while the distance was farther from river, and the δ¹⁸O value of stem water from Tamarix ramosissima was lower than Populus euphratica. Simulated result of mixing modal show that the potential depth of plant water uptake was deeper while the distance was farther from river. At the river bank, Populus euphratica and Tamarix ramosissima could use stream water directly, the largest utilization rate of Populus euphratica was 14.2%, the largest utilization rate of Tamarix ramosissima was 35.3% at flood plain, and the proportional contributions of shallow soil water to plant water uptake was high. Far away from the river bank, the proportional contributions of subsoil water in 0-100 cm and groundwater to water uptake was increases, the Populus euphratica mainly used the soil water under 120 cm and also the groundwater, the largest utilization rate of groundwater is 40%-50%, and the Tamarix ramosissima mainly used groundwater, and the largest utilization rate of groundwater is 94.5%. Populus euphratica survive need suitable water table (350-420 cm), Tamarix ramosissima could grow well either in shallow groundwater area or in the area water table under 450 cm. Contrasted the water sources of Populus euphratica and Tamarix ramosissima, the adaptability of Tamarix ramosissima is superior to Populus euphratica under variable water availability.

Key words: δD, δ¹⁸O stable isotopes, Tarim River, riparian zone, Populus euphratica, Tamarix ramosissima, water source

CLC Number:

Q948.11

Zhou Tianhe, Zhao Chengyi, Wu Guilin, Jiang Shaowei, Yu Yongxiang, Wang Dangdang. Application of Stable Isotopes in Analyzing the Water Sources of Populus euphratica and Tamarix ramosissima in the Upstream of Tarim River[J]. JOURNAL OF DESERT RESEARCH, 2017, 37(1): 124-131.

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Application of Stable Isotopes in Analyzing the Water Sources of Populus euphratica and Tamarix ramosissima in the Upstream of Tarim River

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