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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 21, issue 1
Hydrol. Earth Syst. Sci., 21, 281-294, 2017
https://doi.org/10.5194/hess-21-281-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: Vegetation changes under a changing environment and the impacts...

Hydrol. Earth Syst. Sci., 21, 281-294, 2017
https://doi.org/10.5194/hess-21-281-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 12 Jan 2017

Research article | 12 Jan 2017

On the non-stationarity of hydrological response in anthropogenically unaffected catchments: an Australian perspective

Hoori Ajami1,2, Ashish Sharma1, Lawrence E. Band3, Jason P. Evans4, Narendra K. Tuteja5, Gnanathikkam E. Amirthanathan6, and Mohammed A. Bari7 Hoori Ajami et al.
  • 1School of Civil and Environmental Engineering, University of New South Wales, Sydney, Australia
  • 2Department of Environmental Sciences, University of California Riverside, Riverside, CA, USA
  • 3Department of Geography and Institute for the Environment, University of North Carolina, Chapel Hill, NC, USA
  • 4Climate Change Research Centre, University of New South Wales, Sydney, Australia
  • 5Environment and Research Division, Bureau of Meteorology, Canberra, Australian Capital Territory, Australia
  • 6Environment and Research Division, Bureau of Meteorology, Melbourne, Victoria, Australia
  • 7Environment and Research Division, Bureau of Meteorology, Perth, Western Australia, Australia

Abstract. Increases in greenhouse gas concentrations are expected to impact the terrestrial hydrologic cycle through changes in radiative forcings and plant physiological and structural responses. Here, we investigate the nature and frequency of non-stationary hydrological response as evidenced through water balance studies over 166 anthropogenically unaffected catchments in Australia. Non-stationarity of hydrologic response is investigated through analysis of long-term trend in annual runoff ratio (1984–2005). Results indicate that a significant trend (p<0.01) in runoff ratio is evident in 20 catchments located in three main ecoregions of the continent. Runoff ratio decreased across the catchments with non-stationary hydrologic response with the exception of one catchment in northern Australia. Annual runoff ratio sensitivity to annual fractional vegetation cover was similar to or greater than sensitivity to annual precipitation in most of the catchments with non-stationary hydrologic response indicating vegetation impacts on streamflow. We use precipitation–productivity relationships as the first-order control for ecohydrologic catchment classification. A total of 12 out of 20 catchments present a positive precipitation–productivity relationship possibly enhanced by CO2 fertilization effect. In the remaining catchments, biogeochemical and edaphic factors may be impacting productivity. Results suggest vegetation dynamics should be considered in exploring causes of non-stationary hydrologic response.

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We present the first data-based framework for explaining why catchments behave in a non-stationary manner, even when they are unaffected by deforestation or urbanization. The role of vegetation dynamics in streamflow is indicated by similar or greater sensitivity of annual runoff ratio to annual fractional vegetation cover. We formulated a novel ecohydrologic catchment classification framework that incorporates the role of vegetation dynamics in catchment-scale water partitioning.
We present the first data-based framework for explaining why catchments behave in a...
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