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| Titel |
BVOCs emission in a semi-arid grassland under climate warming and nitrogen deposition |
| VerfasserIn |
H. J. Wang, J. Y. Xia, Y. J. Mu, L. Nie, X. G. Han, S. Q. Wan |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 12, no. 8 ; Nr. 12, no. 8 (2012-04-26), S.3809-3819 |
| Datensatznummer |
250011079
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| Publikation (Nr.) |
 copernicus.org/acp-12-3809-2012.pdf |
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| Zusammenfassung |
| Biogenic volatile organic compounds (BVOCs) profoundly affect atmospheric
chemistry and ecosystem functioning. BVOCs emission and their responses to
global change are still unclear in grasslands, which cover one quarter of
the Earth's land surface and are currently undergoing the largest changes.
Over two growing seasons, we conducted a field experiment in a semi-arid
grassland (Inner Mongolia, China) to examine the emission and the responses
of BVOCs emissions to warming and nitrogen deposition. The natural emission
rate (NER) of monoterpene (dominant BVOCs here) is 107 ± 16 μg m−2 h−1
in drought 2007, and 266 ± 53 μg m−2 h−1
in wet 2008, respectively. Warming decreased the standard emission factor
(SEF) by 24% in 2007, while it increased by 43% in 2008. The
exacerbated soil moisture loss caused by warming in dry season might be
responsible for the decrease of SEF in 2007. A possible threshold of soil
moisture (8.2% (v/v)), which controls the direction of warming effects on
monoterpene emission, existed in the semiarid grassland. Nitrogen deposition
decreased the coverage of Artemisia frigida and hence reduced the NER by 24% across the
two growing seasons. These results suggest that the grasslands dominated by
the extended Artemisia frigida are an important source for BVOCs, while the responses of
their emissions to global changes are more uncertain since they depend on
multifactorial in-situ conditions. |
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