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The cycling of carbon (C) in terrestrial ecosystems is closely coupled withthe cycling of water. An important mechanism connecting ecological andhydrological processes in terrestrial ecosystems is lateral flow of wateralong landscapes. Few studies, however, have examined explicitly howconsideration of water routing affects simulated water and C dynamics interrestrial ecosystems. The objective of this study is to explore howconsideration of water routing in a process-based hydro-ecological modelaffects simulated water and C dynamics. To achieve that end, we rasterizedthe regional hydro-ecological simulation system (RHESSys) and employed therasterized RHESSys (R-RHESSys) in a forested watershed. We performed andcompared two contrasting simulations, one with and another without waterrouting. We found that R-RHESSys was able to correctly simulate majorhydrological and ecological variables regardless of whether water routing wasconsidered. When water routing was considered, however, soil water tabledepth and saturation deficit were simulated to be greater and spatially moreheterogeneous. As a result, water (evaporation, transpiration, andevapotranspiration) and C (forest productivity, soil autotrophic andheterotrophic respiration) fluxes also were simulated to be spatially moreheterogeneous compared to the simulation without water routing. When averagedfor the entire watershed, the three simulated water fluxes were greater whileC fluxes were smaller under simulation considering water routing compared tothat ignoring water routing. In addition, the effects of consideration ofwater routing on simulated C and water dynamics were more apparent in dryconditions. Overall, the study demonstrated that consideration of waterrouting enabled R-RHESSys to better capture our preconception of the spatialpatterns of water table depth and saturation deficit across the watershed.Because soil moisture is fundamental to the exchange of water and C fluxesamong soil, vegetation and the atmosphere, ecosystem and C cycle models thereforeneed to explicitly represent water routing in order to accurately quantifythe magnitude and patterns of water and C fluxes in terrestrial ecosystems

Does consideration of water routing affect simulated water and carbon dynamics in terrestrial ecosystems?