Stable isotope composition for atmospheric water vapor in the forest ecosystem of Mount Tianmu
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摘要: 稳定同位素技术是进一步揭示生态系统碳/水交换对环境条件变化响应的重要手段。学者将此技术用于农田生态系统的较多，关于对森林生态系统的研究几乎没有。利用大气水汽稳定同位素观测系统和常规气象观测系统对浙江省天目山常绿落叶阔叶混交林生态系统进行观测。以2013年8月1日到2013年10月1日观测的数据为依据，对天目山森林生态系统大气水汽稳定同位素组成（v）的影响因素及其相互关系进行了研究。结果显示：在森林生态系统中，大气降水、环境温度、土壤5 cm温度与大气水汽稳定同位素组成的相关性显著（P＜0.05）。土壤5 cm湿度、环境湿度、平均风速、净辐射与大气水汽稳定同位素组成的相关性不显著。和农田生态系统相比，森林生态系统中对大气水汽稳定同位素组成产生影响的环境因素有一定差别。图13参17Abstract: Stable isotope techniques, one of the most effective techniques for understanding carbon and water relationships in terrestrial ecosystems, are commonly used domestically in agricultural but not in forest ecosystems. To establish long-term continuous observations with flux towers in forest ecosystems and to reveal stable isotopic composition of atmospheric water vapor for regional characteristics in ecosystem water balance research, a subtropical evergreen and deciduous broadleaf mixed forest observation tower was established for Mount Tianmu in Zhejiang Province. The tower detected hydrogen and oxygen isotopes and had an in situ measurement system based on Tunable Diode Laser Absorption Spectroscopy （TDLAS）. Also multi-layer gradients for temperature and humidity, wind speed, and radiation using conventional meteorological instruments were operational from December 2012 onward. Based on data observed from August to September 2013, the stable isotope composition of atmospheric water vapor influencing factors and their relationships were analyzed. Results showed that atmospheric rainfall, air temperature, soil temperature at 5 cm soil depth were important environmental factors in the forest ecosystem in Mount Tianmu; the air temperature and water vapor stable isotope composition were fitted in a linear relationship, while the soil temperature at 5 cm soil depth were fitted in a polynomial relationship with water vapor stable isotope composition, and also the statistics showed that the correlation was admirable. Thus, compared to agricultural ecosystems, water vapor stable isotope composition factors in this forest ecosystem had little influence.［Ch, 13 fig. 17 ref.]
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https://zlxb.zafu.edu.cn/article/doi/10.11833/j.issn.2095-0756.2015.03.001
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