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Title: Methane Emission from a Tropical Wetland in Ka‘au Crater, O‘ahu, Hawai‘i. 
Author: Grand, Maxime; Gaidos, Eric
Date: 2010-01
Publisher: Honolulu, University of Hawaii Press
Citation: Grand M, Gaidos E. Methane Emission from a Tropical Wetland in Ka‘au Crater, O‘ahu, Hawai‘i. Pac Sci 64(1): 57-72.
Abstract: Natural tropical wetlands constitute an important but still poorly studied source of atmospheric methane, a powerful greenhouse gas. We measured net methane emission, soil profiles of methane generation and oxidation, and related environmental parameters in a tropical wetland occupying the Ka‘au extinct volcanic crater on the Hawaiian island of O‘ahu. The wetland has a fluctuating water table with dynamics that can be reproduced using precipitation data and a simple model. Median net methane flux was 117 mg m_2 day_1 and is consistent with measurements at other tropical sites. Net methane flux in the Commelina diffusa–dominated vegetation pattern (honohono) was significantly higher than that of the invasive Psidium cattleianum–dominated pattern (strawberry guava). Net methane emission in the honohono vegetation pattern was also significantly higher during the ‘‘wet’’ season compared with the ‘‘dry’’ season, although we did not find a clear correlation between net methane emission, water table level, or precipitation. We show that the measured fluxes are consistent with the integrated potential methane generation over the uppermost 30 cm of soil and consumption of @50% of that methane in the soil. Absence of a correlation between net methane emission and water table level may be due to suppression of the activity of strictly anaerobic methanogens by dynamic redox conditions in the upper layers of soil and varying rates of methane oxidation by facultive methanotrophs.
Series/Report No.: vol. 64, no. 1
Description: v. ill. 23 cm. Quarterly
Pages/Duration: 16 p.
ISSN: 0030-8870
URI: http://hdl.handle.net/10125/23090
LC Subject Headings: Natural history--Periodicals.
Science--Periodicals
Natural history--Pacific Area--Periodicals.

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