2013 Fiscal Year Final Research Report
Biogeochemical and anatomical studies on the mechanisms of tree-mediated methane emissions in forested wetland ecosystems
| Project/Area Number |
23380090
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Forest science
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| Research Institution | Tokyo University of Agriculture (2013)
Hokkaido Research Organization (2011-2012) |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
ISHIZUKA Shigehiro 独立行政法人森林総合研究所, その他部局等, 研究員 (30353577)
SAKATA Tadashi 独立行政法人森林総合研究所, その他部局等, 研究員 (50353701)
YAMAMOTO Fukuju 鳥取大学, 農学部, 教授 (60112322)
YAMADA Kenji 地方独立行政法人北海道立総合研究機構, その他部局等, 研究員 (00414277)
OHNO Yasuyuki 地方独立行政法人北海道立総合研究機構, 研究員 (30414246)
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Keywords | 温室効果ガス / メタンフラックス / 冷温帯湿地林 / 地下水位 / 通気組織 / ヤチダモ / ハンノキ |
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| Research Abstract |
We performed field measurements of CH4 fluxes at tree stems to clarify the major controlling factors of stem CH4 emission rates in cool-temperate forested wetlands. We also conducted anatomical observations of wood structure of tree roots in relation to the possible transport pathway of soil-borne CH4 in a tree body.
CH4 emission rates from stems of mature Fraxinus mandshurica trees varied greatly among individuals within a study site (0.12ha), and showed a spatial gradient apparently corresponding to the difference in water table depth in the site. Large inter-individual differences were also observed in the magnitude of seasonal changes in stem CH4 emission rate. CH4 emission rates were quite stable throughout a 24 h period for foliated trees and similarly for defoliated trees. Well-developed lysigenous intercellular spaces, i.e., aerenchyma tissues, were observed at the cortex of fine roots of mature Fraxinus mandshurica trees.
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