Vegetation plays an important role in mediating future water resources

Ukkola, A.M.; Keenan, T.F.; Kelley, D.I.; Prentice, I.C.. 2016 Vegetation plays an important role in mediating future water resources. Environmental Research Letters, 11 (9), 094022. 8, pp.

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Future environmental change is expected to modify the global hydrological cycle, with consequences for the regional distribution of freshwater supplies. Regional precipitation projections, however, differ largely between models, making future water resource projections highly uncertain. Using two representative concentration pathways and nine climate models, we estimate 21st century water resources across Australia, employing both a process-based dynamic vegetation model and a simple hydrological framework commonly used in water resource studies to separate the effects of climate and vegetation on water resources. We show surprisingly robust, pathway-independent regional patterns of change in water resources despite large uncertainties in precipitation projections. Increasing plant water use efficiency (due to the changing atmospheric CO2) and reduced green vegetation cover (due to the changing climate) relieve pressure on water resources for the highly populated, humid coastal regions of eastern Australia. By contrast, in semi-arid regions across Australia, runoff declines are amplified by CO2-induced greening, which leads to increased vegetation water use. These findings highlight the importance of including vegetation dynamics in future water resource projections.

Item Type: Publication - Article
Digital Object Identifier (DOI):
CEH Sections/Science Areas: Reynard
ISSN: 1748-9326
Additional Information. Not used in RCUK Gateway to Research.: Open Access paper - full text available via Official URL link.
Additional Keywords: CO2 effect, water resources, climate change, vegetation dynamics, climate projections
NORA Subject Terms: Hydrology
Meteorology and Climatology
Date made live: 15 Dec 2016 15:05 +0 (UTC)

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