植物生态学报 ›› 2008, Vol. 32 ›› Issue (4): 961-966.DOI: 10.3773/j.issn.1005-264x.2008.04.026
所属专题: 稳定同位素生态学
温学发, 张世春, 孙晓敏, 于贵瑞
收稿日期:
2007-11-26
接受日期:
2008-02-25
出版日期:
2008-07-30
发布日期:
2008-07-30
基金资助:
WEN Xue-Fa, ZHANG Shi-Chun, SUN Xiao-Min, YU Gui-Rui
Received:
2007-11-26
Accepted:
2008-02-25
Online:
2008-07-30
Published:
2008-07-30
摘要:
植物叶片水H218O富集对大气中O2和CO2的18O收支有着重要影响。蒸腾作用使植物叶片水H218O富集, 而植物叶片水H218O富集的程度主要受大气水汽δ18O和植物蒸腾水汽δ18O的影响。过去, 通过引入稳态假设(蒸腾δ18O等于茎水δ18O)得到Craig-Gordon模型的闭合形式, 或将植物整个叶片水δ18O经过Péclet效应校正后得到植物叶片水δ18O的富集程度。然而, 在几分钟到几小时的短时间尺度上, 植物叶片蒸腾δ18O是变化的, 稳态假设是无法满足的。最近成功地实现了对大气水汽δ18O和δD的原位连续观测, 观测精度(小时尺度)可达到甚至优于稳定同位素质谱仪的观测精度。在非破坏性条件下, 高时间分辨率和连续的大气水汽δ18O和蒸腾δ18O的动态观测, 将提高植物叶片水H218O富集的预测能力。该文综述了植物叶片水H218O富集的理论研究的新进展、研究焦点和观测方法所存在的问题, 旨在进一步加深理解植物叶片水H218O富集的过程及其机制。
温学发, 张世春, 孙晓敏, 于贵瑞. 叶片水H218O富集的研究进展. 植物生态学报, 2008, 32(4): 961-966. DOI: 10.3773/j.issn.1005-264x.2008.04.026
WEN Xue-Fa, ZHANG Shi-Chun, SUN Xiao-Min, YU Gui-Rui. RECENT ADVANCES IN H218O ENRICHMENT IN LEAF WATER. Chinese Journal of Plant Ecology, 2008, 32(4): 961-966. DOI: 10.3773/j.issn.1005-264x.2008.04.026
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