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Chinese Journal of Applied Ecology ›› 2019, Vol. 30 ›› Issue (6): 1823-1832.doi: 10.13287/j.1001-9332.201906.009

• Special Features of Stable Isotope Ecology • Previous Articles     Next Articles

Characteristics of hydrogen and oxygen isotopes in precipitation and moisture sources in Gaoyou, Jiangsu Province, China

SUI Ming-zhen1, GAO De-qiang1, XU Qing1,*, HE Dong-mei2, WANG Lei2, WANG Ting1   

  1. 1Key Laboratory of Forest Ecology and Environment of the National Forestry and Grassland Administration, Reserch Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China;
    2Jiangsu Academy of Forestry, Nanjing 211153, China
  • Received:2018-11-16 Online:2019-06-15 Published:2019-06-15
  • Supported by:
    This work was supported by the Special Fund for Forest Scientific Research in the Public Welfare (201504423) and National Natural Science Foundation of China (31670720, 31170661)

Abstract: It is necessary to examine the characteristics of hydrological cycle in Gaoyou area of Jiang-su Province in response to climate change and flood disasters. In this study, 121 atmospheric rain samples were collected and environmental factors were recorded from July 2015 to October 2017. We analyzed the hydrogen and oxygen stable isotopic composition of rain and identify moisture sources in this area. Results showed that the hydrogen and oxygen isotopic composition of rain had an seasonal variation, which was positive in the winter but negative in the summer. D-excess value was higher in winter than that in summer. On the annual scale, significantly negative relationships between δD (δ18O) and temperature and between δD (δ18O) and precipitation indicated the “anti-temperature effect” and “precipitation amount effect”, respectively. On the seasonal scale, there was no obvious “temperature effect” but “precipitation amount effect” in autumn and winter. Results from the HYSPLIT model showed that the precipitation in this area came mainly from ocean evaporation that was influenced by the Chinese South Sea, Indian Ocean and Pacific Ocean. Precipi-tation in other seasons mainly came from the water vapor mixture from the Eurasian continent, Atlantic Ocean, Arctic Ocean, as well as local evaporation. The seasonal pattern of δD and δ18O values in precipitation was mainly influenced by monsoon activity and El Niño-Southern Oscillation (ENSO). In addition, the precipitation isotopes clearly indicated the shift in climates from El Niño to La Niña.