Impacts of elevated CO 2 , climate change and their interactions on water budgets in four different catchments in Australia

摘要: Summary Future water availability is affected directly by climate change mainly through changes in precipitation and indirectly the biological effects of elevated atmospheric CO 2 concentration (eCO ) vegetation use. Previous studies impact on hydrology have focused direct little has been reported literature catchment-scale indirect impact. In this study, we calibrated an ecohydrological model (WAVES) used to estimate interactive effect between eCO four different catchments Australia with contrasting regime cover. These were: a water-limited forest catchment energy-limited catchment, grass catchment. The future meteorological forcing was projected from 12 GCMs representing period centred 2050s set as 550 ppm. Modelling experiments show that impacts growth, evapotranspiration (ET) runoff were same magnitude but opposite directions all catchments, except for Predicted responses indicate increased ∼2% decreased other three 1% 18%. This study indicates rising increases ecosystem use efficiency it does not necessarily result because also stimulates growth ET. Elevated proved greater than catchments. suggest are important, especially predicting leaf area index (LAI) ET grassland or where 1–6%. It implies assumption linear combination individual most previous appropriate. highlights importance considering assessing balance failure account its can lead large bias predictions budgets, Australia.