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  • Breann Coffaro

Emma Lieberman
​Aronson

Diversity, abundance and functional responses of methane-cycling microorganisms to variations in oxygen, nitrogen and water content of coastal forest soil​

Abstract:



Methane (CH4) is the second most important greenhouse gas, accounting for about 20%

of global heating. Microbial production and consumption, mostly taking place in the soil, govern

all CH4 flux into and out of the atmosphere at the Earth’s surface. Recently, the atmospheric CH4

concentration has become erratic and unpredictable, requiring more mechanistic understanding

in order for models to predict future methane trends. Though not quantitatively understood, soil

nitrogen, oxygen and moisture levels impact microbial methane uptake and release on a local

scale. My research addresses a key air pollution issue: the effect of varied nitrogen

deposition and precipitation on the methane production and consumption in natural soils.

Previous studies of microbial methane dynamics have only characterized crop systems or

provided limited snapshots of natural system methane-cycling microbial diversity or function,

not both. This study incorporates a wide array of methods to give a clear picture of forest

methane dynamics in terms of microbial diversity, abundance and function, across micro to

regional scales, seasons, nitrogen deposition levels and precipitation events. This will lead to

better modeling capabilities as well as strategies for greenhouse gas remediation via

manipulation of methane-cycling microbes themselves.

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