JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2021, Vol. 45 ›› Issue (5): 235-241.doi: 10.12302/j.issn.1000-2006.202003006

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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 E-mail:lguo1992@163.com;xuxia.1982@yahoo.com

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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