亚热带地区马尾松树干呼吸碳同位素组成的时间变化特征及其控制因子

生态学杂志

亚热带地区马尾松树干呼吸碳同位素组成的时间变化特征及其控制因子

闫丽飞¹,杨庆朋^2,3,关欣^2,3,黄苛^2,3,张诗萌⁴,赵峰侠^1*

（¹山西师范大学地理科学学院，山西临汾 041004； ²中国科学院森林生态与管理重点实验室，中国科学院沈阳应用生态研究所，沈阳 110016；³中国科学院会同森林生态实验站，亚热带森林生态系统结构与服务功能湖南省重点实验室，湖南会同 418307；⁴沈阳工学院生命工程学院，沈阳 113122）

出版日期:2020-06-10 发布日期:2020-06-10

Temporal dynamics of carbon isotope composition of stem respiration and its controlling factors in Pinus massoniana trees in subtropical China.

YAN Li-fei¹, YANG Qing-peng^2,3, GUAN Xin^2,3, HUANG Ke^2,3, ZHANG Shi-meng⁴, ZHAO Feng-xia^1*

(¹College of Geographical Sciences, Shanxi Normal University, Linfen 041004, Shanxi, China; ²CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; ³Huitong National Research Station of Forest Ecosystem, Hunan Key Laboratory for Structure and Ecosystem Service of Subtropical Forest, Huitong 418307, Hunan, China; ⁴College of Life Engineering, Shenyang Institute of Technology, Shenyang 113122, China).

Online:2020-06-10 Published:2020-06-10

摘要/Abstract

摘要： 作为森林生态系统碳循环的重要组成部分，树干呼吸的时空变异性直接决定着全球碳库对气候变化的响应和反馈。然而，目前关于树干呼吸的时间变化特征，尤其是树干呼吸碳同位素组成（δ¹³C）变化的控制机理还存在很大的不确定性。为探明树干呼吸及其碳同位素的时间变化特征，采用气室法并利用基于光腔衰荡光谱（CRDS）技术组装的Picarro观测系统，于2018年8月—2019年10月对6棵马尾松进行树干呼吸及其同位素的监测，同时测定树干液流速率和树干温度。结果表明：（1）树干呼吸速率及其δ¹³C值均不存在明显的日变化模式，且与树干液流、树干温度相关性不显著；（2）树干呼吸速率季节变化趋势明显，变化范围为0.08～1.61 μmol·m^-2·s^-1，且树干温度解释了树干呼吸速率季节变化的82%；（3）树干呼吸δ¹³C呈现先升高后下降的季节变化模式，非生长季的平均δ¹³C为-23.25‰±0.91‰，显著高于生长季的-27.93‰±0.25‰。研究表明，树干呼吸及其碳同位素组成在不同时间尺度上其变化模式和可能的调控机制不同，尤其是树干呼吸碳同位素组成的季节变化模式为研究树干呼吸的生理生态过程提供了新的视角。

关键词: 生态网络, 生态安全格局, 相关长度-逐块筛选指数, 青岛市, 介数指数

Abstract: Stem respiration plays an important role in global carbon cycle, the temporal and spatial variations of which drive the responses and feedback of global carbon pool to climate change. There is still large uncertainty, however, about the temporal variation of stem respiration, especially its stable carbon isotope composition (δ¹³C). To understand the temporal variation of stem respiration and its stable carbon isotope composition, we monitored stem respiration from six individuals of Pinus massoniana by the chamber method and the Picarro observation system based on cavity ringdown spectroscopy (CRDS) during August 2018 to October 2019. The sap flow rate and stem temperature were also measured. The results showed that: (1) there was no obvious diurnal variation of stem respiration rate and δ¹³C value, which were not significantly correlatedwith sap flow and stem temperature. (2) There was an obvious seasonal variation of stem respiration rate, ranging from 0.08 to 1.61 μmol·m^-2·s^-1. Stem temperature explained 82% of the seasonal variation of stem respiration rate. (3) δ¹³C of stem respiration increased first and then decreased. The average δ¹³C value (-23.25‰±0.91‰) of stem respiration in the non-growing season was significantly higher than that (-27.93‰±0.25‰) in the growing season. Our results suggest that stem respiration and its carbon isotope composition were different in different time scales, and that the seasonal dynamics of stable carbon isotope composition of stem respiration provides a new perspective for understanding stem respiration and possible intrinsic mechanisms.

Key words: correlation length-percentage of importance of omitted patches, Qingdao City., ecological network, betweenness centrality index, dynamic ecological security pattern

闫丽飞,杨庆朋,关欣,黄苛,张诗萌,赵峰侠. 亚热带地区马尾松树干呼吸碳同位素组成的时间变化特征及其控制因子[J]. 生态学杂志.

YAN Li-fei, YANG Qing-peng, GUAN Xin, HUANG Ke, ZHANG Shi-meng, ZHAO Feng-xia. Temporal dynamics of carbon isotope composition of stem respiration and its controlling factors in Pinus massoniana trees in subtropical China.[J]. cje.

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