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Water yield and biomass production for on a eucalypt-dominated Mediterranean catchment under different climate scenarios

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林业研究:英文版 2023年第5期34卷 1263-1278页

作者： Joao Rocha Ana Quintela Dalila Serpa Jan Jacob Keizer Sérgio Fabres RAIZ-forest and Paper Research Institute Quinta de S.FranciscoRua JoséEstevao(EN 230-1)3800–783 EixoAveiroPortugal Department of Environment and Planning Centre of Environmental and Marine Studies(CESAM)University of AveiroCampus Universitário de Santiago3810–193 AveiroPortugal

Worldwide,forests are vital in the regulation of the water cycle regulation and in water balance allocation.Knowledge of ecohydrological responses of production forests is essential to support management strategies,especially where water is already scarce.Shifting climatological patterns are expected to impact thermopluviometric regimes,water cycle components,hydrological responses,and plant physiology,evapotranspiration rates,crop productivity and land management operations.This work(1)assessed the impacts of different predicted climate conditions on water yield;(2)inferred the impacts of climate change on biomass production on eucalypt-to-eucalypt succes sion.To this end,the widely accepted Soil and Water Assessment Tool(SWAT)was run with the RCA,HIRHAM5 and RACMO climate models for two emission scenarios(RCP 4.5 and8.5).Three 12-year periods were considered to simulate tree growth under coppice regime.The results revealed an overall reduction in streamflow and water yield in the catchment in line with the projected reduction in total annual precipitation.Moreover,HIRHAM5 and RACMO models forecast a slight shift in seasonal streamflow of up to 2 months(for2024-2048)in line with the projected increase in precipitation from May to September.For biomass production,the extreme climate model(RCA)and severe emis sion scenario(RCP 8.5)predicted a decrease up to 46%.However,in the less extreme and more-correlated(with actual catchment climate conditions)climate models(RACMO and HIRHAM5)and in the less extreme emission scenario(RCP 4.5),biomass production increased(up to 20%),and the growth cycle was slightly reduced.SWAT was proven to be a valuable tool to assess climate change impacts on a eucalypt-dominated catchment and is a suitable decision-support tool for forest managers.

关键词： Climate scenarios forested catchments Forest ecohydrological modelling Eucalypt biomass production SWAT model

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