An evaluation of the Gash interception model in a northern hardwood stand |
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| Institution: | 1. School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China;2. Beijing Collaborative Innovation Center for Eco-environmental Improvement with Forestry and Fruit Trees, Beijing 102206, China;3. Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China;4. Department of Biological and Environmental Sciences, Alabama A & M University, Normal, AL 35762, USA;5. Department of Water Resources Engineering, Lund University, Lund 233 62, Sweden;6. China National Forestry Economics and Development Research Center, National Forestry and Grassland Administration, Beijing 100714, China;7. USDA Forest Service, Pacific Southwest Research Station, Albany, CA 94710, USA;1. College of Forestry, Shenyang Agricultural University, Dongling St. 120, Shenyang, Liaoning Province 110866, People''s Republic of China;2. Key Laboratory of Forest Tree genetics and Breeding of Liaoning Province, Dongling St. 120, Shenyang, Liaoning Province 110866, People''s Republic of China;3. Research Station of Liaohe-River Plain Forest Ecosystem, Chinese Forest Ecosystem Research Network, Shenyang Agricultural University, Dongling St. 120, Shenyang, Liaoning Province 110866, People''s Republic of China |
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| Abstract: | During the growing season of 1995, canopy water fluxes were measured within a northern hardwood stand in southern Ontario, Canada. Observed canopy interception loss, throughfall, and stemflow fluxes from the stand were 19.3±3.5%, 76.4±2.9%, and 4.3±2.0% of incident precipitation, respectively. Both the original and revised Gash analytical rainfall interception loss models simulated these fluxes within the standard error of the observed estimates, suggesting that the analytical model may be appropriate for further applications within this forest type. The revised Gash model is recommended for further applications as it is better physically based. Both the original and revised models suggest that ～60% of interception loss during the study period was evaporation from the canopy once rainfall has ceased while evaporation from the saturated canopy during rainfall accounted for ～27%–33% of interception loss. Additional components of interception (e.g., evaporation from trunks) were computed to be minor contributors to total canopy interception loss. |
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