中国农业科学院农业信息研究所 中国农学会
Agricultural Information Institute of CAAS China Association of Agricultural Science Societies
En
Ch
中国农业科学院农业信息研究所 中国农学会 主办

AI检索

订阅

返回顶部
当前位置: 首页 > 文章 > 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 2020 (6) 1911-1920
Position: Home > Articles > Temporal dynamics of carbon isotope composition of stem respiration and its controlling factors in Pinus massoniana trees in subtropical China Chinese Journal of Ecology 2020 (6) 1911-1920

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

作  者：
闫丽飞;杨庆朋;关欣;黄苛;张诗萌;赵峰侠
单  位：
关键词：
马尾松;树干呼吸;碳同位素组成(δ13C);液流速率;树干温度;时间尺度
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(δ~(13)C)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δ~(13)C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0.08～1.61μmol·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δ~(13)C呈现先升高后下降的季节变化模式,非生长季的平均δ~(13)C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。
译  名：
Temporal dynamics of carbon isotope composition of stem respiration and its controlling factors in Pinus massoniana trees in subtropical China
作  者：
YAN Li-fei;YANG Qing-peng;GUAN Xin;HUANG Ke;ZHANG Shi-meng;ZHAO Feng-xia;College of Geographical Sciences,Shanxi Normal University;CAS Key Laboratory of Forest Ecology and Management,Institute of Applied Ecology,Chinese Academy of Sciences;Huitong National Research Station of Forest Ecosystem,Hunan Key Laboratory for Structure and Ecosystem Service of Subtropical Forest;College of Life Engineering,Shenyang Institute of Technology;
关键词：
Pinus massoniana;;stem respiration;;stable carbon isotope composition(δ13C);;sap flow velocity;;stem temperature;;temporal dynamics
摘  要：
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( δ~(13)C). 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 δ~(13)C 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) δ~(13)C of stem respiration increased first and then decreased. The average δ~(13)C 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.

相似文章

导出引用
计量
文章访问数: 10
HTML全文浏览量: 0
PDF下载量: 0

所属期刊

推荐期刊

友情链接Friendly link
农业信息研究所Agricultural information institute 农业智能知识服务平台Agricultural intelligent knowledge service platform 农业学术服务平台Agricultural Knowledge Service System 中国知网CNKI 维普网VIP 万方WANFANG DATA
联系我们Contact us

电话Tell：010-82109652-808

邮箱E-mail：agrijournal@caas.cn

服务Service
关于我们About us 意见建议Opinions and suggest
版权说明Copyright
单位：中国农业科学院农业信息研究所 中国农学会 © 2017中国农业科学院农业信息研究所 ICP备案号：京ICP备09089781号-46