RHESSys Pieces Coupling water, carbon, nutrients L. Band, C. Tague.

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RHESSys Pieces Coupling water, carbon, nutrients L. Band, C. Tague

Key processes incorporated in RHESSys Water, carbon, nutrient cycling in situ –interception, evaporation, transpiration, infiltration –photosynthesis, respiration, allocation, –decomposition, mineralization, N-cycling, plant uptake Lateral water redistribution –surface runoff –saturated throughflow Groundwater recharge/discharge

The watershed as an object hierarchy Land surface processes have characteristic scales and locations within the landscape –synoptic meteorological inputs: region –regional groundwater flow: aquifer system –stream routing: watershed –runoff production: hillslope –soil/canopy/atmosphere interactions: vegetation stand –saturated/unsaturated zone dynamics: pedon

Day-trans MT-CLIM Forest-BGC RESSys-89 W-DTM DHSVM routing GLOBAL-BGC BIOME-BGC RHESSys-96 CENTURY NGAS RHESSys-00 MODIS-BGC Evolution of the RHESSys paradigm

Infrastructure impacts on flowpaths

RHESSys Object Hierarchy

Full vs. Aspatial Distribution Approach

Patch

Conceptual Model

Hierarchical watershed structure

Pond Branch Catchment – Control Color Infrared Digital Orthophotography

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Spatial Pattern of Soil Moisture

Spatial Pattern of N-export

High Summer Stream nitrate conc. for both model and stream sampling RHESSys Model Performance Corresponding with lower summer denitrification due to drying of the soil

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