caa a22 4500 605517045 CHVBK 20210128100717.0 cr unu---uuuuu 210128e20150401xx s 000 0 eng 10.1007/s10533-015-0070-y doi (NATIONALLICENCE)springer-10.1007/s10533-015-0070-y Spatial and temporal variability in methane emissions from tree stems of Fraxinus mandshurica in a cool-temperate floodplain forest [Elektronische Daten] [Kazuhiko Terazawa, Kenji Yamada, Yasuyuki Ohno, Tadashi Sakata, Shigehiro Ishizuka] We performed field measurements on the spatial and temporal variability in CH4 emissions from stem surfaces of mature Fraxinus mandshurica Rupr. trees in a floodplain forest of northern Japan. Stem CH4 fluxes were measured by a static closed-chamber method at ca. 15cm above ground on ten selected trees to test among-individual variability, and the diurnal and seasonal changes in three representative trees. Daytime stem CH4 emission rates varied between 81 and 1,305µgCH4m−2h−1 among individual trees, and showed a spatial gradient apparently corresponding to the difference in water table depth at the experimental site. Stem CH4 fluxes were quite stable throughout a 24h period for foliated trees in August and were similar for defoliated trees in November. Large differences were observed in the magnitude of seasonal changes in stem CH4 flux among individual trees; one sampled tree showed no clear seasonal changes in stem CH4 flux, while another tree exhibited drastic seasonal changes ranging larger than one order of magnitude. Results demonstrated the high variability in stem CH4 emissions in space and time, and suggested the importance of soil temperature, water table depth and porewater CH4 concentration as possible environmental factors controlling stem CH4 emissions from temperate forested wetlands. Springer International Publishing Switzerland, 2015 Diurnal and seasonal change nationallicence Forested wetland nationallicence Fraxinu s nationallicence Methane emissions nationallicence Tree stem nationallicence Terazawa Kazuhiko Department of Bioproduction, Tokyo University of Agriculture, 099-2493, Abashiri, Hokkaido, Japan aut Yamada Kenji Forestry Research Institute, Hokkaido Research Organization, 079-0198, Bibai, Hokkaido, Japan aut Ohno Yasuyuki Forestry Research Institute, Hokkaido Research Organization, 079-0198, Bibai, Hokkaido, Japan aut Sakata Tadashi Forestry and Forest Products Research Institute, 305-8687, Tsukuba, Ibaraki, Japan aut Ishizuka Shigehiro Forestry and Forest Products Research Institute, 305-8687, Tsukuba, Ibaraki, Japan aut Biogeochemistry Springer International Publishing 123/3(2015-04-01), 349-362 0168-2563 123:3<349 2015 123 10533 https://doi.org/10.1007/s10533-015-0070-y text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10533-015-0070-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Terazawa Kazuhiko Department of Bioproduction, Tokyo University of Agriculture, 099-2493, Abashiri, Hokkaido, Japan aut NATIONALLICENCE 700 1- Yamada Kenji Forestry Research Institute, Hokkaido Research Organization, 079-0198, Bibai, Hokkaido, Japan aut NATIONALLICENCE 700 1- Ohno Yasuyuki Forestry Research Institute, Hokkaido Research Organization, 079-0198, Bibai, Hokkaido, Japan aut NATIONALLICENCE 700 1- Sakata Tadashi Forestry and Forest Products Research Institute, 305-8687, Tsukuba, Ibaraki, Japan aut NATIONALLICENCE 700 1- Ishizuka Shigehiro Forestry and Forest Products Research Institute, 305-8687, Tsukuba, Ibaraki, Japan aut NATIONALLICENCE 773 0- Biogeochemistry Springer International Publishing 123/3(2015-04-01), 349-362 0168-2563 123:3<349 2015 123 10533