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Chinese Journal of Applied Ecology ›› 2017, Vol. 28 ›› Issue (7): 2299-2306.doi: 10.13287/j.1001-9332.201707.022

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Impacts of dominated landscape types on hydrogen and oxygen isotope effects of spring water in the Hani Rice Terraces

JIAO Yuan-mei*, LIU Cheng-jing, LIU Xin, LIU Zhi-lin, DING Yin-ping   

  1. School of Tourism and Geographical Sciences, Yunnan Normal University, Kunming 650500, China
  • Received:2017-02-23 Revised:2016-05-03 Published:2017-07-18
  • Contact: *mail:ymjiao@sina.com
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (41271203) and Open Fund for Key Laboratory of Plateau Lake Ecology and Global Change.

Abstract: Analysis of hydrogen and oxygen stable isotopes is an effective method to track the water cycle in watershed. Impact of landscape pattern on the isotope effects of spring water is a new interdisciplinary topic between landscape ecology and isotope hydrology. Taking the Quanfuzhuang River basin located in the core area of UNESCO World Cultural Heritage of Honghe Hani Rice Terrace as the object, collecting the monthly samples of 78 points of spring water and 39 precipitation at altitude of 1500 m (terraces), 1700 m (terraces) and 1900 m (forest) from March 2015 to March 2016, we analyzed the hydrogen and oxygen stable isotopes of water samples under the different landscape types. The results indicated that the dominated landscape types were forests and rice terraces, being 66.6% and 22.1% of the whole landscape area respectively, and they had a spatial vertical pattern of forest located at the mountain top and rice terraces at the down-slope. The correlation analysis showed that the spring water not only came from the precipitation, but also from other water sources which had a more positive δ18O and δD values, the spring water in up-slope forests mainly came from precipitation, while that in down-slope rice terraces came from precipitation, ri-ver water, rice terrace water and under ground water. Therefore, the mixing effects of spring water δ18O and δD were more significant in rice terraces. The overall altitude effect of the hydrogen and oxygen stable isotopes in spring water was obvious. The linear decreasing rates of δ18O and δD values were -0.125‰·(100 m)-1and -0.688‰·(100 m)-1, respectively. The deuterium surplus value increased with the altitude because of the impacts of landscape pattern and the local cycle of water isotopes. In summary, the dominant landscape types had a significant impact on the hydrogen and oxygen isotopes of spring water, which could be used as response indicator to reveal the impacts of landscape pattern on hydrological process.