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Bibliothèque new LandscapeDNDC biogeochemical module to predict CH4 and N 2O emissions from lowland rice and upland cropping systems

new LandscapeDNDC biogeochemical module to predict CH4 and N 2O emissions from lowland rice and upland cropping systems

new LandscapeDNDC biogeochemical module to predict CH4 and N 2O emissions from lowland rice and upland cropping systems

Resource information

Date of publication
Décembre 2015
Resource Language
ISBN / Resource ID
AGRIS:US201500078326
Pages
125-149

BACKGROUND AND AIMS: Replacing paddy rice by upland systems such as maize cultivation is an on-going trend in SE Asia caused by increasing water scarcity and higher demand for meat. How such land management changes will feedback on soil C and N cycles and soil greenhouse gas emissions is not well understood at present. METHODS: A new LandscapeDNDC biogeochemical module was developed that allows the effect of land management changes on soil C and N cycle to be simulated. The new module is applied in combination with further modules simulating microclimate and crop growth and evaluated against observations from field experiments. RESULTS: The model simulations agree well with observed dynamics of CH₄emissions in paddy rice depending on changes in climatic conditions and agricultural management. Magnitude and peak emission periods of N₂O from maize cultivation are simulated correctly, though there are still deficits in reproducing day-to-day dynamics. These shortcomings are most likely related to simulated soil hydrology and may only be resolved if LandscapeDNDC is coupled to more complex hydrological models. CONCLUSIONS: LandscapeDNDC allows for simulation of changing land management practices in SE Asia. The possibility to couple LandscapeDNDC to more complex hydrological models is a feature needed to better understand related effects on soil-atmosphere-hydrosphere interactions.

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Authors and Publishers

Author(s), editor(s), contributor(s)

Kraus, David
Weller, Sebastian
Klatt, Steffen
Haas, Edwin
Wassmann, Reiner
Kiese, Ralf
Butterbach-Bahl, Klaus

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