RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2016, Vol. 25 >> Issue (06): 989-995.doi: 10.11870/cjlyzyyhj201606016

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ANALYSIS OF STABLE OXYGEN ISOTOPE OF SOIL-PLANT-GROUNDWATER IN POYANG LAKE WETLAND

DENG Zhi-min1, ZHANG Xiang2, ZHANG Hua3, PAN Guo-yan2, QIN Xue-quan4   

  1. 1. Changjiang Water Resources Protection Institute, Wuhan 430051, China;
    2. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China;
    3. Jiangxi Province Survey and Design Research Institute, Nanchang 330095, China;
    4. Shandong Provincial Lubei Geo-engineering Exploration Institutes, Dezhou 253015, China
  • Received:2015-09-30 Revised:2016-02-03 Online:2016-06-20
  • Supported by:
    National Natural Science Foundation of China (Grant No. 51409191)

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Abstract: Poyang Lake is the largest freshwater lake in China and is also the largest single area of habitat for migratory birds. The water level of Poyang Lake continues to decline, and extreme droughts have frequently occurred in recent years, so that the structure and function of the wetland ecosystem are destroyed. In this paper, stable oxygen isotopes were used as a tracer to identify composition of soil water, lake water, ground water and plant water. The focus was on characterizing the variation with depth of the stable oxygen isotope composition and identifying the main sources of oxygen in soil water profiles, groundwater and plant water, understanding the mechanisms of water movement among them. Soil water sampled at 10 cm intervals over the top 100 cm at two sites in the Poyang Lake wetland, and water samples collected from the plants, lake and river water and ground water were analyzed for stable oxygen isotope composition, to explore the recharge and discharge of relationship between them. The results indicate that the range of the stable oxygen isotope value of soil water from two sites varied from –10.48‰ to –5.23‰ and –12.39‰ to –6.55‰, respectively, average value of which were –8.36‰ and –8.63‰. The value of δ18O at depth of 0 to 30 cm at one site declined with increasing soil depth, however, the value of δ18O at depth of 0 to 40 cm at another site had unchanged with increasing soil depth. The value of δ18O of groundwater at one site was smaller than that of Xiu River, at another site was nearly close to that of the Gan River. Thus, the groundwater at one site was mainly influenced by precipitation, at another site by precipitation, lake and river water. The average value of δ18O of the domain plant Phalaris arundinacea Linn leave at two sites in Poyang Lake wetland were the largest, –0.9‰, Crex cinerascens, –4.23‰, and Phragmites Adans the smallest, –5.25‰. The value of δ18O of the same plant leave was different at different sample points at same site, maybe due to different characteristics of migration of primary elements such as Ca, Mg at different geomorphological positions(depression, slope) inducing the different impact on plant transpiration. This study provided reference data that could make a useful contribution to the assessment of ecosystem in the Poyang Lake.

Key words: stable oxygen isotope, water supply, Poyang Lake wetland

CLC Number: 

  • S152.7
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