土壤水分胁迫和大气CO2浓度对光合分馏及后光合分馏的影响

doi:10.13287/j.1001-9332.202006.024

应用生态学报 ›› 2020, Vol. 31 ›› Issue (6): 1800-1806.doi: 10.13287/j.1001-9332.202006.024

• 稳定同位素生态学专栏 • 上一篇下一篇

土壤水分胁迫和大气CO₂浓度对光合分馏及后光合分馏的影响

丁兵兵¹, 张永娥², 余新晓^1*, 贾国栋¹, 王渝淞¹, 郑鹏飞¹, 蒋涛¹, 夏娟娟¹

¹北京林业大学水土保持与荒漠化防治教育部重点实验室, 北京 100083;
²中国水利水电科学研究院泥沙研究所, 北京 100038

收稿日期:2019-12-25 出版日期:2020-06-15 发布日期:2020-06-15
通讯作者: * E-mail: yuxinxiao111@126.com
作者简介:丁兵兵, 男, 1997年生, 硕士研究生。主要从事森林生态水文研究。E-mail: fbhbfh@163.com
基金资助:
国家自然科学基金重点项目(41877152)资助

Effects of soil water stress and atmospheric CO₂ concentration on photosynthetic and post-photosynthetic fractionation

DING Bing-bing¹, ZHANG Yong-e², YU Xin-xiao^1*, JIA Guo-dong¹, WANG Yu-song¹, ZHENG Peng-fei¹, JIANG Tao¹, XIA Juan-juan¹

¹Ministry of Education Key Laboratory of Soil and Water Conservation and Desertification Combating, Beijing Forestry University, Beijing 100083, China;
²Institute of Sediment Research, China Institute of Water Resources and Hydropower Research, Beijing 100038, China

Received:2019-12-25 Online:2020-06-15 Published:2020-06-15
Contact: * E-mail: yuxinxiao111@126.com
Supported by:
This work was supported by the Key Project of National Natural Science Foundation of China (41877152).

摘要/Abstract

摘要： 对植物光合和后光合分馏进行分析,有助于提升对植物生理和水分管理等的认识。本研究通过测定大气、侧柏叶片和枝条韧皮部可溶性化合物的δ¹³C,探讨了光合作用时大气和叶片间碳同位素的分馏(ΔC_a-leaf)和光合作用后叶片到枝条间的碳同位素分馏(ΔC_leaf-phlo)对土壤含水量(SWC)和大气CO₂浓度(C_a)的响应。结果表明: ΔC_a-leaf在SWC为田间持水量(FC)的95%～100%(95%～100%FC)且C_a为400 μmol·mol^-1时达到最大值(13.06‰),在SWC为35%～45%FC且C_a为800 μmol·mol^-1时达到最小值(8.63‰);气孔导度和叶肉细胞导度均与ΔC_a-leaf呈显著线性正相关,相关系数分别为0.43和0.44;而ΔC_leaf-phlo并未受到SWC和C_a的显著影响。本研究不仅可以提高对碳同位素的分馏机制的认识,而且可以为植物对未来气候变化的生存适应性提供理论依据。

Abstract: Analysis of plant photosynthesis and post-photosynthetic fractionation can improve our understanding of plant physiology and water management. By measuring δ¹³C in the atmosphere, and δ¹³C of soluble compounds in leaves and branch phloem of Platycladus orientalis, we examined discrimination pattern, including atmosphere-leaf discrimination during photosynthesis (ΔC_a-leaf) and leaf-twig discrimination during post-photosynthesis (ΔC_leaf-phlo), in response to changes of soil water content (SWC) and atmospheric CO₂ concentration (C_a). The results showed that ΔC_a-leaf reached a maximum of 13.06‰ at 95%-100% field water-holding capacity (FC) and C_a 400 μmol·mol^-1, and a minimum of 8.63‰ at 35%-45% FC and C_a 800 μmol·mol^-1. Both stomatal conductance and mesophyll cell conductance showed a significant linear positive correlation with ΔC_a-leaf, with a correlation coefficient of 0.43 and 0.44, respectively. ΔC_leaf-phlo was not affected by SWC and C_a. Our results provide mechanism of carbon isotopes fractionation and a theoretical basis for plant survival strategies in response to future climate change.

丁兵兵, 张永娥, 余新晓, 贾国栋, 王渝淞, 郑鹏飞, 蒋涛, 夏娟娟. 土壤水分胁迫和大气CO₂浓度对光合分馏及后光合分馏的影响[J]. 应用生态学报, 2020, 31(6): 1800-1806.

DING Bing-bing, ZHANG Yong-e, YU Xin-xiao, JIA Guo-dong, WANG Yu-song, ZHENG Peng-fei, JIANG Tao, XIA Juan-juan. Effects of soil water stress and atmospheric CO₂ concentration on photosynthetic and post-photosynthetic fractionation[J]. Chinese Journal of Applied Ecology, 2020, 31(6): 1800-1806.

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土壤水分胁迫和大气CO₂浓度对光合分馏及后光合分馏的影响

Effects of soil water stress and atmospheric CO₂ concentration on photosynthetic and post-photosynthetic fractionation

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