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| Titel |
Responses of nitrous oxide emissions to nitrogen and phosphorus additions in two tropical plantations with N-fixing vs. non-N-fixing tree species |
| VerfasserIn |
W. Zhang, X. Zhu, Y. Luo, R. Rafique, H. Chen, J. Huang, J. Mo |
| 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 ; 11, no. 18 ; Nr. 11, no. 18 (2014-09-16), S.4941-4951 |
| Datensatznummer |
250117595
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| Publikation (Nr.) |
 copernicus.org/bg-11-4941-2014.pdf |
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| Zusammenfassung |
| Leguminous tree plantations at phosphorus (P) limited sites may result in
excess nitrogen (N) and higher rates of nitrous oxide (N2O) emissions.
However, the effects of N and P applications on soil N2O emissions from
plantations with N-fixing vs. non-N-fixing tree species have rarely been
studied in the field. We conducted an experimental manipulation of N and/or
P additions in two plantations with Acacia auriculiformis (AA, N-fixing)
and Eucalyptus urophylla (EU, non-N-fixing) in South China. The objective was to determine the effects of N or
P addition alone, as well as NP application together on soil N2O
emissions from these tropical plantations. We found that the average
N2O emission from control was greater in the AA (2.3 ± 0.1 kg
N2O–N ha−1 yr−1) than in EU plantation (1.9 ± 0.1 kg
N2O–N ha−1 yr−1). For the AA plantation, N addition stimulated
N2O emission from the soil while P addition did not. Applications of N
with P together significantly decreased N2O emission compared to
N addition alone, especially in the high-level treatments (decreased by
18%). In the EU plantation, N2O emissions significantly decreased in
P-addition plots compared with the controls; however, N and NP additions
did not. The different response of N2O emission to N or P addition was
attributed to the higher initial soil N status in the AA than that of EU
plantation, due to symbiotic N fixation in the former. Our result suggests
that atmospheric N deposition potentially stimulates N2O emissions from
leguminous tree plantations in the tropics, whereas P fertilization has the
potential to mitigate N-deposition-induced N2O emissions from such
plantations. |
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