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- W2147535531 abstract "Until recently, it has been challenging to couple hydrological and biogeochemical processes at the watershedscale. We have coupled two models, WTB and MEL, to simulate lateral water and nutrient fluxes and theirinfluence on ecosystem functioning. WTB is a spatially explicit water balance model. Vertical flow wassimulated using a capacitance model with lateral flow dependent on head development and the local slope ofthe confining layer. The Multiple Element Limitation (MEL) model is an ecosystem model, developed toexamine limitation in vegetation acclimating to changes in the availability of two resources (carbon andnitrogen). MEL also incorporates the recycling of resources through the soil. In our coupled model, nutrientsare treated as inert solutes and are transported vertically as well as laterally using a mixing model. Nutrientsmoving down the slope are repeatedly taken up, cycled through vegetation and soils, and released back intothe soil solution. We are currently identifying the possibilities for incorporating flood dynamics into themodel. We evaluated the impact of adding lateral nutrient fluxes to the original MEL model using a virtualexperiment. The model (coupled and MEL only) was applied to a small, well defined catchment. After asimulation period of three years, we detect a redistribution of the stock of inorganic N. A larger amount of N ispresent near the river than at the top of the slopes of the catchment, largely due to lateral fluxes. Comparingthe coupled model to the MEL model, we also find large losses of inorganic N in the coupled model due tolarge vertical fluxes out of the root zone. These vertical out-fluxes cause a smaller N uptake by plants. Todetect if Carbon (C) uptake by plants is affected due to the changes in N distribution, the simulation periodhas to be increased due to a lag time in the optimization of the C:N ratio in plant biomass." @default.
- W2147535531 created "2016-06-24" @default.
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- W2147535531 date "2010-02-01" @default.
- W2147535531 modified "2023-09-25" @default.
- W2147535531 title "Linking Hydrology and Biogeochemistry to assess the impact of Lateral Nutrient Fluxes" @default.
- W2147535531 hasPublicationYear "2010" @default.
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