Stem CH4 emissions from the reclaimed forests: magnitude, drivers, and contribution
2024
Ge, Mengyu | Tan, Min | Liu, Yang | Institute for Atmospheric and Earth System Research (INAR) ; Helsingin yliopisto = Helsingfors universitet = University of Helsinki | Gembloux Agro-Bio Tech [Faculté universitaire des sciences agronomiques de Gembloux] ([FUSAGx]) ; Université de Liège = University of Liège = Universiteit van Luik = Universität Lüttich (ULiège) | China University of Mining and Technology (CUMT) | Ecologie fonctionnelle et écotoxicologie des agroécosystèmes (ECOSYS) ; AgroParisTech-Université Paris-Saclay-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | The work was supported by the National Natural Science Foundation of China (52204190)
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Mostrar más [+] Menos [-]Inglés. Background : Trees in natural forests are a major contributor to atmospheric methane (CH 4 ), yet these emissions have never been investigated in reclaimed forests. Our study aimed to assess the magnitude, seasonality, drivers, and contributions of tree CH 4 emissions to ecosystem CH 4 flux in the reclaimed forests. We measured CH 4 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 CH 4 emissions and measured tree morphological variables (diameter at breast height, wood density, and lenticel density) to determine species differences in emissions. Results : CH 4 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 CH 4 emissions were primarily driven by growth stage and soil parameters, including soil CH 4 flux, temperature, and moisture. Conclusion : In the reclaimed forests, tree-mediated CH 4 emissions could be an important contributor to ecosystem CH 4 flux, with contributions varying by season. As these forests mature and become ecologically restored, they may significantly impact regional and global CH 4 emissions.
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