Environmental Effects on Carbon Isotope Discrimination from Assimilation to Respiration in a Coniferous and Broad-Leaved Mixed Forest of Northeast China
Environmental Effects on Carbon Isotope Discrimination from Assimilation to Respiration in a Coniferous and Broad-Leaved Mixed Forest of Northeast China
复制标题
东北针阔混交林从同化到呼吸的环境对碳同位素辨别的影响
DOI：
10.3390/f11111156
复制
发表时间：
2020-10
期刊：
影响因子：
2.9
通讯作者：
Jiabing Wu
中科院分区：
文献类型：
--
作者：
Haoyu Diao;Anzhi Wang;Fenghui Yuan;Dexin Guan;Guanhua Dai;Jiabing Wu
光合CO2同化过程中的碳同位素分馏已经得到了广泛的研究，但从叶片到土壤的整个分馏过程还没有得到很好的研究。本研究以中国东北地区针阔混交林为研究对象，通过对大气-土壤碳转移途径中δ 13 C的沿着变化特征的研究，探讨了整个生长季内呼吸通量（叶片、树干、土壤和整个生态系统）δ 13 C与环境因子的关系。研究发现，由于碳同化、分配和呼吸过程中的差别和同位素混合效应，冠层空气中CO2的δ 13 C信号在整个碳转移过程中强烈地烙印在有机库和呼吸库中。针叶树和阔叶树物种之间的同位素模式的显着差异，在叶有机质的季节变化。研究还发现，树干呼吸δ 13 C对环境因子尤其是土壤温度和土壤湿度的季节变化更为敏感，而叶片和土壤呼吸δ 13 C对环境因子的季节变化更为敏感。生态系统呼吸δ 13 C的变化与气温无时滞相关，与土壤温度和水汽压亏缺有10 d的时滞相关，但这种相关性较弱，表明地上和地下过程之间存在滞后联系。同位素的联系可能会混淆的变化，在大气中的空气动力学和土壤扩散条件。这些结果将有助于理解物种的同位素模式的差异，并促进纳入更多的同位素变异相关的影响因素，以过程为基础的生态系统模型。
Carbon (C) isotope discrimination during photosynthetic CO2 assimilation has been extensively studied, but the whole process of fractionation from leaf to soil has been less well investigated. In the present study, we investigated the δ13C signature along the C transfer pathway from air to soil in a coniferous and broad-leaved mixed forest in northeast China and examined the relationship between δ13C of respiratory fluxes (leaf, trunk, soil, and the entire ecosystem) and environmental factors over a full growing season. This study found that the δ13C signal of CO2 from canopy air was strongly imprinted in the organic and respiratory pools throughout C transfer due to the effects of discrimination and isotopic mixing on C assimilation, allocation, and respiration processes. A significant difference in isotopic patterns was found between conifer and broadleaf species in terms of seasonal variations in leaf organic matter. This study also found that δ13C in trunk respiration, compared with that in leaf and soil respiration, was more sensitive to seasonal variations of environmental factors, especially soil temperature and soil moisture. Variation in the δ13C of ecosystem respiration was correlated with air temperature with no time lag and correlated with soil temperature and vapor pressure deficit with a lag time of 10 days, but this correlation was relatively weak, indicating a delayed linkage between above- and belowground processes. The isotopic linkage might be confounded by variations in atmospheric aerodynamic and soil diffusion conditions. These results will help with understanding species differences in isotopic patterns and promoting the incorporation of more influencing factors related to isotopic variation into process-based ecosystem models.
登录
查看更多内容
影响因子：
5.2
作者：
Nate G. McDowell;D. Bowling;B. Bond;James R. Irvine;Beverly E. Law;P. Anthoni;J. Ehleringer
通讯作者：
Nate G. McDowell;D. Bowling;B. Bond;James R. Irvine;Beverly E. Law;P. Anthoni;J. Ehleringer
DOI：
10.1111/j.1469-8137.2010.03384.x
发表时间：
2010-10
期刊：
The New phytologist
影响因子：
--
作者：
L. Wingate;J. Ogée;R. Burlett;A. Bosc;M. Devaux;J. Grace;D. Loustau;A. Gessler
通讯作者：
L. Wingate;J. Ogée;R. Burlett;A. Bosc;M. Devaux;J. Grace;D. Loustau;A. Gessler
影响因子：
6.2
作者：
R. Wehr;S. Saleska
通讯作者：
R. Wehr;S. Saleska
影响因子：
--
作者：
W. Tan;Guoan Wang;Jiamao Han;Min Liu;Liping Zhou;Ting Luo;Z. Cao;Shu-bo Cheng
通讯作者：
W. Tan;Guoan Wang;Jiamao Han;Min Liu;Liping Zhou;Ting Luo;Z. Cao;Shu-bo Cheng
影响因子：
11.6
作者：
Nate G. McDowell;D. Bowling;A. J. Schauer;J. Irvine;B. Bond;Beverly E. Law;J. Ehleringer
通讯作者：
Nate G. McDowell;D. Bowling;A. J. Schauer;J. Irvine;B. Bond;Beverly E. Law;J. Ehleringer