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The Spatial Factor, Rather than Elevated CO 2 , Controls the Soil Bacterial Community in a Temperate Forest Ecosystem
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Zeitschriftentitel: | Applied and Environmental Microbiology |
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Personen und Körperschaften: | , , , , |
In: | Applied and Environmental Microbiology, 76, 2010, 22, S. 7429-7436 |
Format: | E-Article |
Sprache: | Englisch |
veröffentlicht: |
American Society for Microbiology
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Schlagwörter: |
Zusammenfassung: | <jats:title>ABSTRACT</jats:title> <jats:p> The global atmospheric carbon dioxide (CO <jats:sub>2</jats:sub> ) concentration is expected to increase continuously over the next century. However, little is known about the responses of soil bacterial communities to elevated CO <jats:sub>2</jats:sub> in terrestrial ecosystems. This study aimed to partition the relative influences of CO <jats:sub>2</jats:sub> , nitrogen (N), and the spatial factor (different sampling plots) on soil bacterial communities at the free-air CO <jats:sub>2</jats:sub> enrichment research site in Duke Forest, North Carolina, by two independent techniques: an entirely sequencing-based approach and denaturing gradient gel electrophoresis. Multivariate regression tree analysis demonstrated that the spatial factor could explain more than 70% of the variation in soil bacterial diversity and 20% of the variation in community structure, while CO <jats:sub>2</jats:sub> or N treatment explains less than 3% of the variation. For the effects of soil environmental heterogeneity, the diversity estimates were distinguished mainly by the total soil N and C/N ratio. Bacterial diversity estimates were positively correlated with total soil N and negatively correlated with C/N ratio. There was no correlation between the overall bacterial community structures and the soil properties investigated. This study contributes to the information about the effects of elevated CO <jats:sub>2</jats:sub> and soil fertility on soil bacterial communities and the environmental factors shaping the distribution patterns of bacterial community diversity and structure in temperate forest soils. </jats:p> |
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Umfang: | 7429-7436 |
ISSN: |
0099-2240
1098-5336 |
DOI: | 10.1128/aem.00831-10 |