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植物研究 ›› 2020, Vol. 40 ›› Issue (3): 476-480.doi: 10.7525/j.issn.1673-5102.2020.03.020

• 研究简报 • 上一篇    

不同种源白桦根CO2释放通量地点和根径级间的差异

孙硕, 王秀伟, 杜梦甜, 李京航, 王博一, 刘桂丰   

  1. 东北林业大学林学院森林生态系统可持续经营教育部重点实验室, 哈尔滨 150040
  • 收稿日期:2019-10-29 出版日期:2020-05-05 发布日期:2020-05-29
  • 通讯作者: 王秀伟,E-mail:wxgreat@nefu.edu.cn E-mail:wxgreat@nefu.edu.cn
  • 作者简介:孙硕(1995-),男,硕士研究生,主要研究方向为树木生理学。
  • 基金资助:
    国家自然科学基金资助项目(31670476);国家重点研发计划子课题(2018YFC0507003);中央高校基本科研业务费专项(2572019BA15,2572019CP09)

Root CO2 Efflux Variations of Betula platyphylla Among Sites and Root Diameter Classes in 12 Different Provenances

SUN Shuo, WANG Xiu-Wei, DU Meng-Tian, LI Jing-Hang, WANG Bo-Yi, LIU Gui-Feng   

  1. Ministry of Education Key Laboratory of Sustainable Forest Ecosystem Management, School of Forestry, Northeast Forestry University, Harbin 150040
  • Received:2019-10-29 Online:2020-05-05 Published:2020-05-29
  • Supported by:
    This research was financially supported by the National Natural Science Foundation of China(31670476);National Key R&D Program(2018YFC05070030);Fundamental Research Funds for the Central Universities(2572019BA15,2572019CP09)

摘要: 以草河口和帽儿山的12个种源13年生白桦(Betula platyphylla Suk.)为实验材料,在生长季分别取直径<0.5 mm、2.0~5.0 mm和>5.0 mm三个径级根,采用红外线气体分析法离体测定根系CO2释放速率。探讨根系径级、试验地点和种源对白桦根系CO2释放通量的影响。结果表明:根直径和环境对根系CO2释放速率影响显著(P<0.01),而种源对根系CO2释放速率影响不显著(P>0.05)。根CO2释放速率随径级的升高而显著降低(P<0.01)。草河口试验地的白桦各径级根CO2释放速率均显著高于帽儿山试验地的白桦(P<0.01)。草河口试验地和帽儿山实验地白桦直径<0.5 mm根CO2释放速率值分别为104.21和81.07 mol·g-1·s-1,直径2.0~5.0 mm根CO2释放速率分别为41.08和30.91 mol·g-1·s-1,直径>5.0 mm根CO2释放速率分别为24.87和11.37 mol·g-1·s-1。白桦12个种源间的树高和胸径均差异显著(P<0.05),树高和胸径均与根系CO2释放通量呈负相关。相关研究结果将为更准确评估林木根系CO2释放通量提供重要基础。

关键词: 根呼吸, CO2释放通量, 种源, 白桦

Abstract: The 13 years old Betula platyphylla from 12 provenances in Caohekou and Maoershan were used as experimental materials. In the growing season, three diameter classes roots <0.5 mm, 2.0-5.0 mm and >5.0 mm were taken, respectively. The CO2 efflux rate of root system was measured by infrared gas analysis in vitro, in order to study the effect of root diameter, experiment site and provenance on CO2 efflux of B.platyphylla root. The root diameter and environment had significant(P<0.01) effects on root CO2 efflux rate, while provenance had no significant(P>0.05) effects on root CO2 efflux rate. Root CO2 efflux rate decreased significantly(P<0.01) with the increase of diameter class. All diameter class root CO2 efflux rate in Caohekou was greater than that in Maoershan(P<0.01). The root CO2 efflux rates of B.platyphylla in Caohekou and Maoershan with diameters <0.5 mm were 104.21 and 81.07 mol·g-1·s-1, the root CO2 efflux rates with diameters 2.0-5.0 mm were 41.08 and 30.91 mol·g-1·s-1, and the root CO2 efflux rates with diameters >5.0 mm were 24.87 and 11.37 mol·g-1·s-1, respectively. There were significant(P<0.05) differences in tree height and DBH among 12 provenances of B.platyphylla, and both tree height and DBH were negatively correlated with root CO2 efflux. The results of relevant studies will provide an important basis for more accurate assessment of CO2 efflux fluxes from tree roots.

Key words: root respiration, CO2 efflux, provenances, Betula platyphylla

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