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Temporal changes in abundance and composition of ammonia-oxidizing bacterial and archaeal communities in a drained peat soil in relation to N$_{2}$O emissions

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Temporal changes in abundance and composition of ammonia-oxidizing bacterial and archaeal communities in a drained peat soil in relation to N$_{2}$O emissions

Content Provider	Springer Nature Link
Author	Andert, Janet Wessén, Ella Börjesson, Gunnar Hallin, Sara
Copyright Year	2011
Abstract	Boreal peat soils comprise about 3% of the terrestrial environments, and when drained, they become sources of the greenhouse gas nitrous oxide (N$_{2}$O). Ammonia oxidation can result in N$_{2}$O emissions, either directly or by fuelling denitrification, but we know little about the ecology of ammonia-oxidizing bacteria (AOB) and archaea (AOA) in peat soils. Our aim was to determine temporal alterations in abundance and composition of these communities in a drained and forested peat soil in relation to N$_{2}$O emissions and ammonia oxidation activity.The peat was sampled at three different depths in the upper 0.5 m over a period of 9 months covering two summer and two winter samplings. Community composition and abundance were determined by T-RFLP and quantitative real-time PCR of the bacterial and archaeal amoA genes. Potential ammonia oxidation rates were measured using the chlorate inhibition technique, and in situ N$_{2}$O emission was determined using chambers.The soil parameters displayed little spatial and temporal heterogeneity, which probably explained why there were no depth-related effects on the abundance, composition, or activity of the ammonia oxidizers. In contrast to most terrestrial environments, the AOB dominated numerically over the AOA. Both groups changed in community composition between sampling occasions, although the AOB showed more significant seasonal signatures than the AOA. Temporal changes in abundance were only observed for the AOB, with a decrease in numbers from May to March. Such differences were not reflected by the activity or N$_{2}$O emissions.The high ammonium concentrations in the peat soil likely favored the AOB over the AOA, and we hypothesize that they were more active than the AOA and therefore responded to climatic and environmental changes. However, other processes rather than ammonia oxidation were likely responsible for N$_{2}$O emissions at the site.
Starting Page	1399
Ending Page	1407
Page Count	9
File Format	PDF
ISSN	14390108
Journal	Journal of Soils and Sediments
Volume Number	11
Issue Number	8
e-ISSN	16147480
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-08-30
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ammonia oxidizers AOA AOB Nitrous oxide Organic soil Environmental Physics Environment Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Stratigraphy Earth-Surface Processes

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