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| Titel |
Soil organic carbon dynamics under long-term fertilizations in arable land of northern China |
| VerfasserIn |
W. J. Zhang, X. J. Wang, M. G. Xu, S. M. Huang, H. Liu, C. Peng |
| 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. 2 ; Nr. 7, no. 2 (2010-02-02), S.409-425 |
| Datensatznummer |
250004479
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| Publikation (Nr.) |
 copernicus.org/bg-7-409-2010.pdf |
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| Zusammenfassung |
| Soil carbon sequestration is a complex process influenced by agricultural
practices, climate and soil conditions. This paper reports a study of
long-term fertilization impacts on soil organic carbon (SOC) dynamic from
six long-term experiments. The experiment sites are located from
warm-temperate zone with a double-cropping system of corn (Zea mays L.) – wheat
(Triticum Aestivium L.) rotation, to mild-temperate zones with mono-cropping systems of
continuous corn, or a three-year rotation of corn-wheat-wheat. Mineral
fertilizer applications result in an increasing trend in SOC except in the
arid and semi-arid areas with the mono-cropping systems.
Additional manure application is important to maintain SOC level in the arid
and semi-arid areas. Carbon conversion rate is significant lower in the
warm-temperate zone with double cropping system (6.8%–7.7%) than that
in the mild-temperate areas with mono-cropping systems (15.8%–31.0%).
The conversion rate is significantly correlated with annual precipitation
and active accumulative temperature, i.e., higher conversion rate under
lower precipitation and/or temperature conditions. Moreover, soil high in
clay content has higher conversion rate than soils low in clay content. Soil
carbon sequestration rate ranges from 0.07 to 1.461 t ha−1 year−1
in the upland of northern China. There is significantly linear correlation
between soil carbon sequestration and carbon input at most sites, indicating
that these soils are not carbon-saturated thus have potential to migrate
more CO2 from atmosphere. |
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