Emission of Climate-Relevant Trace Gases and Succession of Microbial Communities during Open-Windrow Composting.

Applied and Environmental Microbiology
B HellmannQ Bai

Abstract

Determination of different indicators of microbial biomass, community structure, and bioactivity by the fumigation extraction method, as well as determination of phospholipid fatty acids (PLFAs) and their subfractions and the measurement of trace gases, respectively, provides valuable information about microbial succession in composting processes. The emission rates of carbon dioxide (CO(inf2)), methane (CH(inf4)), and nitrous oxide (N(inf2)O) increased successively during compost maturation: initially in the presence of easily degradable nutrients, during high temperature, and after the temperature had cooled down, respectively. The emission rate patterns of these trace gases corresponded to the concentrations of PLFAs and their particular subfractions. (i) Similar to the CO(inf2) emission rates, microbial biomass estimations by fumigation extraction and by determination of the amount of total PLFAs showed a discontinuous decrease during the composting process, with a slight increase at the end of the observation period. (ii) An increase in ether lipids, indicating the enhanced presence of archaean methanogens, and an elevated CH(inf4) emission were observed at the same time. (iii) The period of enhanced N(inf2)O emission corr...Continue Reading

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