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Effects of interactive global changes on methane uptake in an annual grassland.

Blankinship, Joseph C. and Brown, Jamie R. and Dijkstra, Paul and Hungate, Bruce A. (2010) Effects of interactive global changes on methane uptake in an annual grassland. Journal of Geophysical Research-Biogeosciences, 115. ISSN 0148-0227

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Publisher’s or external URL: http://dx.doi.org/10.1029/2009JG001097

Abstract

The future size of the terrestrial methane (CH4) sink of upland soils remains uncertain, along with potential feedbacks to global warming. Much of the uncertainty lies in our lack of knowledge about potential interactive effects of multiple simultaneous global environmental changes. Field CH4 fluxes and lab. soil CH4 consumption were measured five times during 3 consecutive years in a California annual grassland exposed to 8 years of the full factorial combination of ambient and elevated levels of pptn., temp., atm. CO2 concn., and N deposition. Across all sampling dates and treatments, increased pptn. caused a 61% redn. in field CH4 uptake. However, this redn. depended quant. on other global change factors. Higher pptn. reduced CH4 uptake when temp. or N deposition (but not both) increased, and under elevated CO2 but only late in the growing season. Warming alone also decreased CH4 uptake early in the growing season, which was partly explained by a decrease in lab. soil CH4 consumption. Atm. CH4 models likely need to incorporate nonadditive interactions, seasonal interactions, and interactions between methanotrophy and methanogenesis. Despite the complexity of interactions we obsd. in this multifactor expt., the outcome agrees with results from single-factor expts.: an increased terrestrial CH4 sink appears less likely than a reduced one.

Item Type: Article
Publisher’s Statement: © 2010 by the American Geophysical Union. doi:10.1029/2009JG001097
ID number or DOI: 10.1029/2009JG001097
Keywords: terrestrial methane; CH4; methanotrphic bacteria; upland soil; California; grassland; Jasper Ridge Global Change Experiment;
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Q Science > QH Natural history > QH301 Biology
NAU Depositing Author Academic Status: Faculty/Staff
Department/Unit: College of Engineering, Forestry, and Natural Science > Biological Sciences
Research Centers > Center for Ecosystem Science and Society
Date Deposited: 22 Dec 2015 20:21
URI: http://openknowledge.nau.edu/id/eprint/911

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