[en] Background: Trees in natural forests are a major contributor to atmospheric methane (CH4), yet these emissions have never been investigated in reclaimed forests. Our study aimed to assess the magnitude, seasonality, drivers, and contributions of tree CH4 emissions to ecosystem CH4 flux in the reclaimed forests. We measured CH4 emissions from different emission pathways, including the stems of trees (Populus euramericana, Metasequoia glyptostroboides, and Camphora officinarum), shoots of herbs (Carex breviculmis and Carex dispalata), and soils in the two reclaimed forests with reclamation periods of 12 and 5 years. We identified factors controlling seasonal tree CH4 emissions and measured tree morphological variables (diameter at breast height, wood density, and lenticel density) to determine species differences in emissions. Results: CH4 emissions from trees in the 12-year-old reclaimed forest were significantly higher than those in the 5-year-old forest. Seasonal variations in tree CH4 emissions were primarily driven by growth stage and soil parameters, including soil CH4 flux, temperature, and moisture. Conclusion: In the reclaimed forests, tree-mediated CH4 emissions could be an important contributor to ecosystem CH4 flux, with contributions varying by season. As these forests mature and become ecologically restored, they may significantly impact regional and global CH4 emissions.
Disciplines :
Environmental sciences & ecology
Author, co-author :
Ge, Mengyu ; Department of Agricultural Sciences, University of Helsinki, Helsinki, Finland ; Institute for Atmospheric and Earth System Research (INAR)/Forest Sciences, University of Helsinki, Helsinki, Finland ; Gembloux Agro-Bio Tech, TERRA, Exchanges Ecosystem-Atmosphere, University of Liège, Gembloux, Belgium
Tan, Min; School of Public Policy and Management, China University of Mining and Technology, Xuzhou, China
Liu, Yang; Université Paris-Saclay, INRAE, AgroParisTech, UMR ECOSYS, Palaiseau, France
Language :
English
Title :
Stem CH4 emissions from the reclaimed forests: magnitude, drivers, and contribution
Publication date :
2024
Journal title :
Ecological Processes
eISSN :
2192-1709
Publisher :
Springer Science and Business Media Deutschland GmbH
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