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| Titel |
Responses of soil microbial communities and enzyme activities to nitrogen and phosphorus additions in Chinese fir plantations of subtropical China |
| VerfasserIn |
W. Y. Dong, X. Y. Zhang, X. Y. Liu, X. L. Fu, F. S. Chen, H. M. Wang, X. M. Sun, X. F. Wen |
| 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. 18 ; Nr. 12, no. 18 (2015-09-29), S.5537-5546 |
| Datensatznummer |
250118104
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| Publikation (Nr.) |
 copernicus.org/bg-12-5537-2015.pdf |
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| Zusammenfassung |
| Nitrogen (N) and phosphorus (P) additions to forest ecosystems are known to
influence various above-ground properties, such as plant productivity and
composition, and below-ground properties, such as soil nutrient cycling.
However, our understanding of how soil microbial communities and their
functions respond to nutrient additions in subtropical plantations is still
not complete. In this study, we added N and P to Chinese fir plantations in
subtropical China to examine how nutrient additions influenced soil microbial
community composition and enzyme activities. The results showed that most
soil microbial properties were responsive to N and/or P additions, but
responses often varied depending on the nutrient added and the quantity
added. For instance, there were more than 30 % greater increases in the
activities of β-glucosidase (βG) and N-acetyl-β-D-glucosaminidase (NAG) in the treatments that received nutrient additions
compared to the control plot, whereas acid phosphatase (aP) activity was
always higher (57 and 71 %, respectively) in the P treatment. N and P
additions greatly enhanced the phospholipid fatty acids (PLFAs)
abundance especially in the N2P (100 kg ha−1 yr−1 of N +50 kg ha−1 yr−1 of P)
treatment; the bacterial PLFAs (bacPLFAs), fungal PLFAs
(funPLFAs) and actinomycic PLFAs (actPLFAs) were about 2.5, 3 and 4 times
higher, respectively, than in the CK (control). Soil enzyme activities were noticeably
higher in November than in July, mainly due to seasonal differences in soil
moisture content (SMC). βG or NAG activities were significantly and
positively correlated with microbial PLFAs. These findings indicate that
βG and NAG would be useful tools for assessing the biogeochemical
transformation and metabolic activity of soil microbes. We recommend combined
additions of N and P fertilizer to promote soil fertility and microbial
activity in this kind of plantation. |
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