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| Titel |
The Community Land Model underestimates land-use CO2 emissions by neglecting soil disturbance from cultivation |
| VerfasserIn |
S. Levis, M. D. Hartman, G. B. Bonan |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 7, no. 2 ; Nr. 7, no. 2 (2014-04-16), S.613-620 |
| Datensatznummer |
250115584
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| Publikation (Nr.) |
 copernicus.org/gmd-7-613-2014.pdf |
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| Zusammenfassung |
| The Community Land Model (CLM) can simulate planting and harvesting of crops
but does not include effects of cultivation on soil carbon decomposition.
The biogeochemistry model DayCent does account for cultivation and provides
a baseline for evaluating the CLM. With the goal of representing cultivation
effects on soil carbon decomposition, we implemented the DayCent cultivation
parameterization in the CLM and compared CLM and DayCent simulations at
eight Midwestern United States sites with and without the cultivation
parameterization. Cultivation decreases soil carbon by about 1350 gC m−2
in the CLM and 1660 gC m−2 in DayCent across the eight sites
from the first cultivation (early 1900s) to 2010. CLM crop simulations without
cultivation have soil carbon gain, not loss, over this period, in contrast
to the expected declining trends in agricultural soil carbon. A global
cultivation simulation for 1973–2004 reduces ecosystem carbon by 0.4 Pg yr−1
over temperate corn, soybean, and cereal crop areas, which
occupy approximately 1/3 of global crop area. Earth System Models may
improve their atmospheric CO2 and soil carbon simulations by accounting
for enhanced decomposition from cultivation. |
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