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树轮不同组分稳定碳同位素对气候变化响应敏感性:研究进展与评述

赵业思,王建**,商志远   

  1. (南京师范大学地理科学学院, 南京 210023)
  • 出版日期:2014-09-10 发布日期:2014-09-10

Climate sensitivity differences of stable carbon isotope in different components of tree ring: Research progress and synthesis.

ZHAO Ye-si, WANG Jian**, SHANG Zhi-yuan   

  1. (College of Geography Science, Nanjing Normal University, Nanjing 210023, China)
  • Online:2014-09-10 Published:2014-09-10

摘要:

树轮不同组分稳定碳同位素(δ13C)对气候变化响应的敏感性存在树种差异和地区差异,多数研究认为这与木质部多种组分干扰作用有关。总结已有研究表明,在树木生长受气候因子限制作用较强的地区,对气候变化响应更为敏感的落叶树种或是抽提物含量低、木质素干扰程度小的树种(如栎属),其全木和纤维素δ13C均易表现出对气候变化的显著响应;而在气候因子限制作用弱的地区,抽提物含量高的常绿针叶树种,其纤维素δ13C对气候变化响应的敏感性要明显高于全木。这说明不同树种生理活动特性差异和树木生长所受到的气候环境制约强度可能是不同组分δ13C对气候变化响应敏感差异的因素,其具体作用机制有待进一步研究。其次,单个木质组分对全木和纤维素δ13C相关性的干扰作用在不同地域不同树种中有何规律需要在未来研究中给予重视。最后,应当加强我国东南季风区树轮不同组分δ13C对气候变化响应敏感性的研究。
 

关键词: 短期水分利用效率, 冠层高度, 瞬时水分利用效率, 侧柏林

Abstract:

It is helpful to identify the components of tree ring in which δ13C is most sensitive to climate change by comparing the correlations between the δ13C sequence and climate variables. Sensitivities of δ13C response of the components (e.g. whole wood and cellulose) to climate change vary among tree species or regions, and most research attributes this variation to the interference caused by components in xylem. It can be concluded that δ13C of both whole wood and cellulose significantly responses to climate change in following cases: 1) deciduous species; 2) trees with low contents of extractives and less influenced by lignin (e.g. Quercus); 3) regions where tree growth is strongly restricted by climate. In the latter case, δ13C of cellulose shows stronger sensitivity to climate change in evergreen conifers with higher extractive contents, compared to that of whole wood. In addition to the components in xylem, the factors, such as special physiological processes of trees and climate limitation on tree growth, affect the response sensitivities of δ13C in different components to climate change, and their action mechanisms should be further explored. Meanwhile, more studies should be focused on the interference degree of single xylem components on the correlation between δ13C of whole wood and cellulose for different species or regions. Sensitivities of δ13C response of different components to climate change should also be strengthened in the subtropical monsoon regions of southeast China.
 

Key words: Platycladus orientalis forest, instantaneous water use efficiency, canopy height, short-term water use efficiency