自然资源学报

自然资源学报 ›› 2005, Vol. 20 ›› Issue (5): 660-668.doi: 10.11849/zrzyxb.2005.05.004

• 资源利用与保护 • 上一篇    下一篇

卧龙巴郎山高山灌丛降雨和穿透水稳定性氢氧同位素特征研究

崔军1, 安树青1, 徐振1, 徐庆2, 王中生1, 刘世荣2   

  1. 1. 南京大学生命科学院森林生态与全球变化实验室, 南京 210093;
    2. 中国林业科学院森林生态环境与保护研究所, 北京 100093
  • 收稿日期:2005-01-15 修回日期:2005-03-28 出版日期:2005-10-25 发布日期:2005-10-25
  • 通讯作者: 安树青(1963～),男,河北张北县人,教授,博导,主要科研方向：森林生态与森林水文、湿地生态与 生态工程、生物多样性与外来种、全球变化与碳水循环、土地利用与地理信息系统.E-mail：anshq@nju.edu.cn E-mail:anshq@nju.edu.cn
  • 作者简介:崔军(1982～),男,硕士生,主要从事同位素在生态及水文中的应用研究、森林生态、高山草甸生态研究.
  • 基金资助:

    国家重点基础研究发展规划项目(2002CB111504).

Isotopic Characteristics of Precipitation and Throughfall of Alpine Shrubs on Balang Mountains in Wolong

CUI Jun1, AN Shu-qing1, XU Zheng1, XU Qing2, WANG Zhong-sheng1, LIU Shi-rong2   

  1. 1. Laboratory of Forest Ecology and Global Change, School of Life Science, Nanjing University, Nanjing 210093, China;
    2. Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100093, China
  • Received:2005-01-15 Revised:2005-03-28 Online:2005-10-25 Published:2005-10-25

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49 | 13

摘要： 论文对巴郎山区夏季降雨和不同海拔样地穿透水的H、O同位素特征进行了研究。由于8月底9月初冷气团的到来较大地改变了降雨的同位素特征,该地区夏季大气降水线为δD=9.93δ18,/sup>O+26.07,偏离全球降水线(GMWL)较多。降雨的温度效应和雨量效应表现出相互交叉的现象,表明该地区温度和雨量是交替起主导作用而引起降雨同位素组成变化的。H的同位素效应比O明显,其原因是H同位素分馏比O剧烈,从而对环境因子的响应比O灵敏,因此H同位素在森林水文研究中比O更有用。H同位素值在不同样地穿透水间存在差异,这是由它们不同的植被结构及周边微环境因子引起的水分蒸发状况和对雾水截获能力差异导致的。穿透水和降雨同位素值间存在较强线性关系。穿透水的同位素值不一定大于降雨,表明影响穿透水同位素值的因素不仅仅是水分蒸发和植被对雾水的截获,而应是多种因素的综合效应,对这些因素的全面了解将对同位素技术在森林水文研究中的进一步应用有重要意义。

关键词: 稳定性氢氧同位素, 降雨, 雨量效应, 温度效应, 穿透水, 卧龙

Abstract: Stable hydrogen(H) and oxygen(O) isotopic characteristics of precipitation and through-fall of alpine shrubs were studied in this paper.The summer Local Meteoric Water Line (LMWL) of Balang Mountains is δD=9.93δO+26.07,which is different from the Global Meteoric Water Line (GMWL),exhibiting higher slope and intercept values.This was attributed to the influences of cold air mass on the isotopic composition of rainfall during late August and early September.The amount effect and temperature effect of precipitation appeared alternately,indicating that the alternate domination of the amount of rainfall and temperature resulfed in the variation of precipitation isotopic composition.Moreover,the isotopic effects of H were more significant than those of O.This was because the fractionation of H isotopes is stronger than that of O isotopes in nature and H isotopes are more sensitive to the variation of environmental factors than O.So,H isotopes are more useful in the research of forestry hydrology.Besides,there were apparent differences between the throughfall of different plots,which is the result of different evaporation rates of water droplets and fog-intercepting capacity caused by different vegetation structures.There was a strong correlation between the δ value of rainfall and throughfall.The δ value of throughfall is not necessarily larger than that of rainfall,indicating that there are more factors influencing the isotopic composition of throughfall other than the evaporation rate of water droplets and the fog-intercepting capacity of vegetation.A good understanding of these factors will be of great significance to the further application of stable isotopic techniques in the research of forestry hydrology.

Key words: stable isotope, precipitation, amount effect, temperature effect, throughfall, Wolong

中图分类号: 

  • S715.2