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| Titel |
Historical and simulated ecosystem carbon dynamics in Ghana: land use, management, and climate |
| VerfasserIn |
Z. Tan, L. L. Tieszen, E. Tachie-Obeng, S. Liu, A. M. Dieye |
| 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 ; 6, no. 1 ; Nr. 6, no. 1 (2009-01-08), S.45-58 |
| Datensatznummer |
250003314
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| Publikation (Nr.) |
 copernicus.org/bg-6-45-2009.pdf |
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| Zusammenfassung |
| We used the General Ensemble biogeochemical Modeling System (GEMS) to
simulate responses of natural and managed ecosystems to changes in land use
and land cover, management, and climate for a forest/savanna transitional
zone in central Ghana. Model results show that deforestation for crop
production during the 20th century resulted in a substantial reduction in
ecosystem carbon (C) stock from 135.4 Mg C ha−1 in 1900 to
77.0 Mg C ha−1 in 2000, and in soil organic C stock within the top
20 cm of soil from 26.6 Mg C ha−1 to 21.2 Mg C ha−1. If no
land use change takes place from 2000 through 2100, low and high climate
change scenarios (increase in temperature and decrease in precipitation over
time) will result in losses of soil organic C stock by 16% and 20%,
respectively. A low nitrogen (N) fertilization rate is the principal
constraint on current crop production. An increase in N fertilization under
the low climate change scenario would lead to an increase in the average crop
yield by 21% with 30 kg N ha−1 and by 42% with 60 kg N ha−1
(varying with crop species), accordingly, the average soil C stock would
decrease by 2% and increase by 17%, in all cropping systems by 2100. The
results suggest that a reasonable N fertilization rate is critical to achieve
food security and agricultural sustainability in the study area through the
21st century. Adaptation strategies for climate change in this study area
require national plans to support policies and practices that provide
adequate N fertilizers to sustain soil C and crop yields and to consider high
temperature tolerant crop species if these temperature projections are
exceeded. |
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