期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 569, 期 -, 页码 1478-1488出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2016.06.238
关键词
Forest; Carbon; Water; Phosphorus; Parameterization
资金
- NASA New Investigator Award (NIP) [NNH13ZDA001N]
- Terrestrial Ecology Program as part of the North American Carbon Program [NNH12AU03I]
- DOE Great Lakes Bioenergy Research Center (DOE BER Office of Science) [DE-FC02-07ER64494, KP1601050]
- DOE Great Lakes Bioenergy Research Center (DOE EERE OBP) [20469-19145]
- Division Of Environmental Biology
- Direct For Biological Sciences [1027341] Funding Source: National Science Foundation
As a widely used watershed model for assessing impacts of anthropogenic and natural disturbances on water quantity and quality, the Soil and Water Assessment Tool (SWAT) has not been extensively tested in simulating water and carbon fluxes of forest ecosystems. Here, we examine SWAT simulations of evapotranspiration (ET), net primary productivity (NPP), net ecosystem exchange (NEE), and plant biomass at ten AmeriFlux forest sites across the U.S. We identify unrealistic radiation use efficiency (Bio_E), large leaf to biomass fraction (Bio_LEAF), and missing phosphorus supply from parent material weathering as the primary causes for the inadequate performance of the default SWAT model in simulating forest dynamics. By further revising the relevant parameters and processes, SWAT's performance is substantially improved. Based on the comparison between the improved SWAT simulations and flux tower observations, we discuss future research directions for further enhancing model parameterization and representation of water and carbon cycling for forests. (C) 2016 Elsevier B.V. All rights reserved.
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