NDLI: Spatial and temporal variability in methane emissions from tree stems of Fraxinus mandshurica in a cool-temperate floodplain forest

Content Provider	Springer Nature Link
Author	Terazawa, Kazuhiko Yamada, Kenji Oh, Yasuyuki Sakata, Tadashi Ishizuka, Shigehiro
Copyright Year	2015
Abstract	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. 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 CH4 emission rates varied between 81 and 1,305 µg CH4 m−2 h−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 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 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.
Starting Page	349
Ending Page	362
Page Count	14
File Format	PDF
ISSN	01682563
Journal	Biogeochemistry
Volume Number	123
Issue Number	3
e-ISSN	1573515X
Language	English
Publisher	Springer International Publishing
Publisher Date	2015-01-25
Publisher Place	Cham
Access Restriction	Subscribed
Subject Keyword	Diurnal and seasonal change Forested wetland Fraxinus Methane emissions Tree stem Biogeosciences Ecosystems Environmental Chemistry Life Sciences
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Environmental Chemistry Water Science and Technology

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