摘要
植物体碳收支中,茎秆木质组织内的CO_(2)同化——枝干光合是一个十分重要但经常被忽视的部分。本研究利用LI-6400XT便携式光合作用测量系统与特制光合叶室(P-Chamber)相结合的方法,原位监测了同一生境下7种木本植物萌芽前后枝干的光合特征,并比较了其与叶片水分利用效率的差异。结果显示:枝干光合能够抵消枝干呼吸释放CO_(2)的67.8%~122.5%,可有效减少植物体的碳损失;枝干光合为叶片总光合速率的2.9%~23.5%,并且枝干水分利用效率可高达叶片水分利用效率的12.5倍,研究表明,枝干光合维持植株个体碳平衡的作用不容忽视,预测未来气候变化背景下碳循环动态变化需要考虑枝干光合的贡献。
The assimilation of CO_(2)in the woody tissue of stems is an important but always overlooked part in plant carbon budgets.In this study,the LI-6400 XT portable photosynthesis measurement system and a special photosynthetic leaf chamber(P-Chamber)were used to measure stem photosynthesis of seven woody species in the same habitat,and to compare water use efficiency between leaves and stems.Our results showed that stem photosynthesis could offset CO_(2)emission from stem respiration by 67.8%-122.5%,thereby effectively reducing plant carbon loss.Stem photosynthesis accounted for 2.9%-23.5%of gross photosynthesis in leaves.Moreover,water use efficiency in stems was as high as 12.5 times of leaves.Our results indicated that the role of stem photosynthesis in maintaining plant carbon balance could not be ignored.It is necessary to consider the contribution of stem photosynthesis to predict the dynamics of carbon cycle under the background of climate change.
作者
冯晓龙
黄新焕
李民青
马杰
刘冉
FENG Xiao-long;HUANG Xin-huan;LI Min-qing;MA Jie;LIU Ran(State Key Laboratory of Desert and Oasis Ecology,Xinjiang Institute of Ecology and Geographyy Chinese Academy of Sciences,Urumqi 830011,China;Xinjiang Normal University,Urumqi 830054,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《生态学杂志》
CAS
CSCD
北大核心
2022年第4期654-660,共7页
Chinese Journal of Ecology
基金
“天山青年计划”项目(2018Q081)
天山雪松计划(2019XB11)
国家自然科学基金-联合基金(U1903301)
上海合作国际合作项目(2020E01046)资助。
关键词
枝干光合
枝干呼吸
碳循环
荒漠生态系统
生活史对策
stem photosynthesis
stem respiration
carbon cycle
desert ecosystem
life history strategy
