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| Titel |
Soil moisture and land use are major determinants of soil microbial community composition and biomass at a regional scale in northeastern China |
| VerfasserIn |
L. Ma, C. Guo, X. Lu, S. Yuan, R. Wang |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 12, no. 8 ; Nr. 12, no. 8 (2015-04-30), S.2585-2596 |
| Datensatznummer |
250117920
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| Publikation (Nr.) |
 copernicus.org/bg-12-2585-2015.pdf |
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| Zusammenfassung |
| Global environmental factors impact soil microbial communities and further
affect organic matter decomposition, nutrient cycling and vegetation
dynamic. However, little is known about the relative contributions of
climate factors, soil properties, vegetation types, land management
practices and spatial structure (which serves as a proxy for underlying effects of
temperature and precipitation for spatial variation) on soil microbial
community composition and biomass at large spatial scales. Here, we
compared soil microbial communities using phospholipid fatty acid method
across 7 land use types from 23 locations at a regional scale in
northeastern China (850 × 50 km). The results showed that soil
moisture and land use changes were most closely related to microbial
community composition and biomass at the regional scale, while soil total C
content and climate effects were weaker but still significant. Factors such
as spatial structure, soil texture, nutrient availability and vegetation
types were not important. Higher contributions of gram-positive bacteria
were found in wetter soils, whereas higher contributions of gram-negative
bacteria and fungi were observed in drier soils. The contributions of
gram-negative bacteria and fungi were lower in heavily disturbed soils than
historically disturbed and undisturbed soils. The lowest microbial biomass
appeared in the wettest and driest soils. In conclusion, dominant climate
and soil properties were not the most important drivers governing microbial
community composition and biomass because of inclusion of irrigated and
managed practices, and thus soil moisture and land use appear to be primary
determinants of microbial community composition and biomass at the regional
scale in northeastern China. |
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