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Spatial and temporal variability in methane emissions from tree stems of Fraxinus mandshurica in a cool-temperate floodplain forest.
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- Author(s): Terazawa, Kazuhiko; Yamada, Kenji; Ohno, Yasuyuki; Sakata, Tadashi; Ishizuka, Shigehiro
- Source:
Biogeochemistry; Apr2015, Vol. 123 Issue 3, p349-362, 14p- Subject Terms:
- Source:
- Additional Information
- Subject Terms:
- Abstract: We performed field measurements on the spatial and temporal variability in CH emissions from stem surfaces of mature Fraxinus mandshurica Rupr. trees in a floodplain forest of northern Japan. Stem CH fluxes were measured by a static closed-chamber method at ca. 15 cm above ground on ten selected trees to test among-individual variability, and the diurnal and seasonal changes in three representative trees. Daytime stem CH emission rates varied between 81 and 1,305 µg CHmh among individual trees, and showed a spatial gradient apparently corresponding to the difference in water table depth at the experimental site. Stem CH fluxes were quite stable throughout a 24 h 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 CH flux among individual trees; one sampled tree showed no clear seasonal changes in stem CH flux, while another tree exhibited drastic seasonal changes ranging larger than one order of magnitude. Results demonstrated the high variability in stem CH emissions in space and time, and suggested the importance of soil temperature, water table depth and porewater CH concentration as possible environmental factors controlling stem CH emissions from temperate forested wetlands. [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of Biogeochemistry is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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