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| Titel |
Increase in soil organic carbon by agricultural intensification in northern China |
| VerfasserIn |
Y. Liao, W. L. Wu, F. Q. Meng, P. Smith, R. Lal |
| 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. 5 ; Nr. 12, no. 5 (2015-03-05), S.1403-1413 |
| Datensatznummer |
250117844
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| Publikation (Nr.) |
 copernicus.org/bg-12-1403-2015.pdf |
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| Zusammenfassung |
| Agricultural intensification has contributed greatly to the sustained food
supply of China's population of 1.3 billion over the 30-year period from 1982
to 2011. Intensification has several and widely recognized negative
environmental impacts including depletion of water resources, pollution of
water bodies, greenhouse gas emissions and soil acidification. However, there
have been few studies over this period on the impacts of intensification on
soil organic carbon (SOC) at the regional level. The present study was
conducted in Huantai County, a typical intensive farming region in northern
China, to analyze the temporal dynamics of SOC influenced by climate and
farming practices. The results indicate that from 1982 to 2011, SOC content
and density in the 0–20 cm layer of the cropland increased from
7.8 ± 1.6 to 11.0 ± 2.3 g kg−1 (41%) and from
21.4 ± 4.3 to 33.0 ± 7.0 Mg ha−1 (54%), respectively.
The SOC stock (0–20 cm) of the farmland for the entire county increased
from 0.75 to 1.2 Tg (59%). Correlation analysis revealed that
incorporation of crop residues significantly increased SOC, while an increase
in the mean annual temperature decreased the SOC level. Therefore,
agricultural intensification has increased crop productivity and contributed
to SOC sequestration in northern China. In the near future, more appropriate
technologies and practices must be developed and implemented for a
maintenance or enhancement of SOC in this region and elsewhere in northern
China, which also reduce non-CO2 greenhouse gas emissions, since the
climate benefit from the additional SOC storage is estimated to be smaller
than the negative climate impacts of N2O from N fertilizer additions. |
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