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| Titel |
Quantifying nitrous oxide emissions from Chinese grasslands with a process-based model |
| VerfasserIn |
F. Zhang, J. Qi, F. M. Li, C. S. Li, C. B. Li |
| 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 ; 7, no. 6 ; Nr. 7, no. 6 (2010-06-28), S.2039-2050 |
| Datensatznummer |
250004854
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| Publikation (Nr.) |
 copernicus.org/bg-7-2039-2010.pdf |
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| Zusammenfassung |
| As one of the largest land cover types, grassland can potentially
play an important role in the ecosystem services of natural
resources in China. Nitrous oxide (N2O) is a major greenhouse
gas emitted from grasslands. Current N2O inventory at a
regional or national level in China relies on the emission factor
method, which is based on limited measurements. To improve the
accuracy of the inventory by capturing the spatial variability of
N2O emissions under the diverse climate, soil and management
conditions across China, we adopted an approach by utilizing a
process-based biogeochemical model, DeNitrification-DeComposition
(DNDC), to quantify N2O emissions from Chinese grasslands. In
the present study, DNDC was tested against datasets of N2O
fluxes measured at eight grassland sites in China with encouraging
results. The validated DNDC was then linked to a GIS database
holding spatially differentiated information of climate, soil,
vegetation and management at county-level for all the grasslands in
the country. Daily weather data for 2000–2007 from 670
meteorological stations across the entire domain were employed to
serve the simulations. The modelled results on a national scale
showed a clear geographic pattern of N2O emissions. A
high-emission strip showed up stretching from northeast to central
China, which is consistent with the eastern boundary between the
temperate grassland region and the major agricultural regions of
China. The grasslands in the western mountain regions, however,
emitted much less N2O. The regionally averaged rates of
N2O emissions were 0.26, 0.14 and 0.38 kg nitrogen (N)
ha−1 y−1 for the temperate, montane and
tropical/subtropical grasslands, respectively. The annual mean
N2O emission from the total 337 million ha of grasslands in
China was 76.5 ± 12.8 Gg N for the simulated years. |
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