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| Titel |
Does consideration of water routing affect simulated water and carbon dynamics in terrestrial ecosystems? |
| VerfasserIn |
G. Tang, T. Hwang, S. M. Pradhanang |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 18, no. 4 ; Nr. 18, no. 4 (2014-04-11), S.1423-1437 |
| Datensatznummer |
250120333
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| Publikation (Nr.) |
 copernicus.org/hess-18-1423-2014.pdf |
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| Zusammenfassung |
| The cycling of carbon (C) in terrestrial ecosystems is closely coupled with
the cycling of water. An important mechanism connecting ecological and
hydrological processes in terrestrial ecosystems is lateral flow of water
along landscapes. Few studies, however, have examined explicitly how
consideration of water routing affects simulated water and C dynamics in
terrestrial ecosystems. The objective of this study is to explore how
consideration of water routing in a process-based hydro-ecological model
affects simulated water and C dynamics. To achieve that end, we rasterized
the regional hydro-ecological simulation system (RHESSys) and employed the
rasterized RHESSys (R-RHESSys) in a forested watershed. We performed and
compared two contrasting simulations, one with and another without water
routing. We found that R-RHESSys was able to correctly simulate major
hydrological and ecological variables regardless of whether water routing was
considered. When water routing was considered, however, soil water table
depth and saturation deficit were simulated to be greater and spatially more
heterogeneous. As a result, water (evaporation, transpiration, and
evapotranspiration) and C (forest productivity, soil autotrophic and
heterotrophic respiration) fluxes also were simulated to be spatially more
heterogeneous compared to the simulation without water routing. When averaged
for the entire watershed, the three simulated water fluxes were greater while
C fluxes were smaller under simulation considering water routing compared to
that ignoring water routing. In addition, the effects of consideration of
water routing on simulated C and water dynamics were more apparent in dry
conditions. Overall, the study demonstrated that consideration of water
routing enabled R-RHESSys to better capture our preconception of the spatial
patterns of water table depth and saturation deficit across the watershed.
Because soil moisture is fundamental to the exchange of water and C fluxes
among soil, vegetation and the atmosphere, ecosystem and C cycle models therefore
need to explicitly represent water routing in order to accurately quantify
the magnitude and patterns of water and C fluxes in terrestrial ecosystems. |
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