 |
| Titel |
Impacts of management practices on soil organic carbon in degraded alpine meadows on the Tibetan Plateau |
| VerfasserIn |
X. F. Chang, X. X. Zhu, S. P. Wang, S. J. Cui, C. Y. Luo, Z. H. Zhang, A. Wilkes |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 11, no. 13 ; Nr. 11, no. 13 (2014-07-03), S.3495-3503 |
| Datensatznummer |
250117500
|
| Publikation (Nr.) |
 copernicus.org/bg-11-3495-2014.pdf |
|
|
|
|
|
| Zusammenfassung |
| Grassland soil organic carbon (SOC) is sensitive to anthropogenic activities.
Increased anthropogenic disturbance related to overgrazing has led to
widespread alpine grassland degradation on the Tibetan Plateau. The degraded
grasslands are considered to have great potential for carbon sequestration
after adoption of improved management practices. Here, we calibrated and
employed the Century model to investigate the effects of overgrazing and
improved managements on the SOC dynamics in alpine meadows. We calibrated
the Century model against plant productivity at the Haibei Research Station. SOC
stocks for validation were obtained in 2009–2010 from degraded alpine
meadows in two communes. We found that Century model can successfully capture
grassland SOC changes. Overall, our simulation suggests that degraded alpine
meadow SOC significantly increased with the advent of restoration management
from 2011 to 2030. Carbon sequestration rates ranged between 0.04 Mg C ha−1 yr−1 in lightly degraded winter grazing grasslands and
2.0 Mg C ha−1 yr−1 in moderately degraded summer grazing
grasslands. Our modelling work also predicts that improve management in
degraded Tibetan grasslands will contribute to an annual carbon sink of
0.022–0.059 Pg C yr−1. These results imply that restoration of
degraded grasslands in the Tibetan Plateau has great potential for soil carbon
sequestration to mitigate greenhouse gases. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|