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| Titel |
Soil organic carbon in the Sanjiang Plain of China: storage, distribution and controlling factors |
| VerfasserIn |
D. H. Mao, Z. M. Wang, L. Li, Z. H. Miao, W. H. Ma, C. C. Song, C. Y. Ren, M. M. Jia |
| 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. 6 ; Nr. 12, no. 6 (2015-03-16), S.1635-1645 |
| Datensatznummer |
250117858
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| Publikation (Nr.) |
 copernicus.org/bg-12-1635-2015.pdf |
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| Zusammenfassung |
| The accurate estimation of soil organic carbon (SOC) storage and determination of
its pattern-controlling factors is critical to understanding the ecosystem
carbon cycle and ensuring ecological security. The Sanjiang Plain, an
important grain production base in China, is typical of ecosystems, yet its
SOC storage and pattern has not been fully investigated because of insufficient
soil investigation. In this study, 419 soil samples obtained in 2012 for each
of the three soil depth ranges 0–30, 30–60, and 60–100 cm and a
geostatistical method are used to estimate the total SOC storage and density
(SOCD) of this region. The results give rise to 2.32 Pg C for the SOC
storage and 21.20 kg m−2 for SOCD, which is higher than the mean value
for the whole country. The SOCD shows notable changes in lateral and vertical
distribution. In addition, vegetation, climate, and soil texture, as well as
agricultural activities, are demonstrated to have remarkable impacts on the
variation in SOCD of this region. Soil texture has stronger impacts on the
distribution of SOCD than climate in the Sanjiang Plain. Specifically, clay
content can explain the largest proportion of the SOC variations (21.2%
in the top 30 cm) and is the most dominant environmental controlling factor.
Additionally, the effects of both climate and soil texture on SOCD show a weakening with increasing soil layer depth. This study indicates that
reducing the loss of SOC requires effective conservation and restoration
efforts of wetlands and forestlands, as well as sensible fertilization. The results
from this study provide the most up-to-date knowledge on the storage and pattern
of SOC in the Sanjiang Plain and have important implications for the
determination of ecosystem carbon budgets and understanding ecosystem
services. |
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