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タイトル: | One year of continuous measurements of soil CH4 and CO2 fluxes in a Japanese cypress forest: Temporal and spatial variations associated with Asian monsoon rainfall |
著者: | Sakabe, Ayaka Kosugi, Yoshiko https://orcid.org/0000-0002-0256-8404 (unconfirmed) Takahashi, Kenshi https://orcid.org/0000-0002-5905-2708 (unconfirmed) Itoh, Masayuki https://orcid.org/0000-0002-7070-616X (unconfirmed) Kanazawa, Akito Makita, Naoki Ataka, Mioko |
著者名の別形: | 坂部, 綾香 |
発行日: | 14-Apr-2015 |
出版者: | American Geophysical Union |
誌名: | Journal of Geophysical Research: Biogeosciences |
巻: | 120 |
号: | 4 |
開始ページ: | 585 |
終了ページ: | 599 |
抄録: | We examined the effects of Asian monsoon rainfall on CH[4] absorption of water-unsaturated forest soil. We conducted a 1 year continuous measurement of soil CH[4] and CO[2] fluxes with automated chamber systems in three plots with different soil characteristics and water content to investigate how temporal variations in CH[4] fluxes vary with the soil environment. CH[4] absorption was reduced by the “Baiu” summer rainfall event and peaked during the subsequent hot, dry period. Although CH[4] absorption and CO[2] emission typically increased as soil temperature increased, the temperature dependence of CH[4] varied more than that of CO[2], possibly due to the changing balance of activities between methanotrophs and methanogens occurring over a wide temperature range, which was strongly affected by soil water content. In short time intervals (30 min), the responses of CH[4] and CO[2] fluxes to rainfall were different for each plot. In a dry soil plot with a thick humus layer, both fluxes decreased abruptly at the peak of rainfall intensity. After rainfall, CO[2] emission increased quickly, while CH[4] absorption increased gradually. Release of accumulated CO[2] underground and restriction and recovery of CH[4] and CO[2] exchange between soil and air determined flux responses to rainfall. In a wet soil plot and a dry soil plot with a thinner humus layer, abrupt decreases in CH[4]fluxes were not observed. Consequently, the Asian monsoon rainfall strongly influenced temporal variations in CH[4] fluxes, and the differences in flux responses to environmental factors among plots caused large variability in annual budgets of CH[4] fluxes. |
著作権等: | © 2015 American Geophysical Union 許諾条件により本文ファイルは2015-10-14に公開. |
URI: | http://hdl.handle.net/2433/198880 |
DOI(出版社版): | 10.1002/2014JG002851 |
出現コレクション: | 学術雑誌掲載論文等 |
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