南京林业大学学报(自然科学版) ›› 2021, Vol. 45 ›› Issue (5): 235-241.doi: 10.12302/j.issn.1000-2006.202003006

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树干甲烷的研究进展

郭亮(), 丁九敏, 徐侠*()   

  1. 南京林业大学生物与环境学院,南方现代林业协同创新中心,江苏 南京 210037
  • 收稿日期:2020-03-03 接受日期:2021-02-25 出版日期:2021-09-30 发布日期:2021-09-30
  • 通讯作者: 徐侠
  • 基金资助:
    国家自然科学基金青年科学基金项目(31700376);江苏省高等学校自然科学研究重大项目(17KJA180006);江苏省“六大人才高峰”项目(JY-041&TD-XYDXX-006);江苏高校优势学科建设工程资助项目(PAPD);南京林业大学“5151”人才计划项目

Advances in research on methane from tree stems

GUO Liang(), DING Jiuming, XU Xia*()   

  1. College of Biology and the Environment, Co-Innovation Center for the Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China
  • Received:2020-03-03 Accepted:2021-02-25 Online:2021-09-30 Published:2021-09-30
  • Contact: XU Xia

摘要:

在全球变暖背景下,甲烷 (CH4) 作为陆地生态系统中仅次于CO2的重要温室气体受到了广泛关注,其在百年时间尺度上的温室效应潜力是CO2的28~34倍,对全球变暖的贡献占20%~30%。现有对森林生态系统CH4的研究主要集中在土壤,但基于热带森林地表排放估算和卫星CH4通量之间的差异报告,以及近年的研究证明了树木是森林CH4预算的重要来源和汇。笔者综合分析了树干CH4的来源、通量大小、影响因素及其对陆地碳预算的影响,结果发现:①树干释放出的CH4是来自土壤或者树木心材,然后主要通过树干扩散释放到空气中;②树干CH4的通量范围为(-37.5±18.75)~(16 937.50±6 812.50) μmol/(m2·h);③树干表面CH4通量具有较大的时空差异性,这些差异主要来自树种、年龄、组织类型、立地特征和环境条件等;④在不考虑树干CH4通量的前提下,森林湿地 (或木本沼泽) 生态系统的CH4释放量部分可能被低估,而旱地或者高山森林中CH4的吸收量部分可能被高估。树干甲烷作为陆地碳循环的“新成员”,应该被充分重视,这对于预测未来全球气候变化具有重要意义。

关键词: 树干甲烷, 温室气体, 碳循环, 陆地生态系统

Abstract:

Methane (CH4) as the second most important greenhouse gas in terrestrial ecosystems after carbon dioxide (CO2) has received extensive attention in the context of global warming. With the same quantity (number of moles) of greenhouse gas, the greenhouse effect of CH4 in 100 years is 28 to 34 times that of CO2, and atmospheric CH4 is responsible for approximately 20% to 30% of global warming. Reports of a discrepancy between emissions-based estimates and satellite-based estimates of CH4 sources in tropical forests have generated interest in tree surfaces as a neglected source. Numerous studies in recent years have also proved that trees are an important source and sink of forest CH4 budget. By review in published literatures, this paper comprehensively analyzed the source, flux size, influencing factors of CH4 in tree stems and its impact on terrestrial carbon budget. We found that: ① CH4 released by the stems was produced in the soil or in the heartwood of the tree, and then diffused through the stems into the air.② The flux range of stems CH4 was from(-37.5±18.75) to (16 937.50±6 812.50) μmol/(m2·h).③ The CH4 flux on the surface of the stems had a large spatiotemporal difference, which mainly comes from the species, age, tissue type, site characteristics and environmental conditions. ④ The CH4 released from forest wetland (or woody swamp) might be underestimated, while the CH4 absorption from dryland or alpine forests might be overestimated, without considering the CH4 flux from the stems. As a new member of the terrestrial carbon cycle, tree-stems methane should be given sufficient attention, which was of great significance for predicting future global climate change.

Key words: stems methane, greenhouse gases, carbon cycle, terrestrial ecosystem

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