Abstract
Vegetation information is seldom considered in lumped conceptual rainfall-runoff models. This paper uses two modified rainfall-runoff models, the Xinanjiang-ET and SIMHYD-ET models in which vegetation leaf area index is incorporated, to investigate impacts of vegetation change and climate variability on streamflow in a Southern Australian catchment, the Crawford River experimental catchment, where Tasmanian blue gum plantations were introduced gradually from 1998 till 2005. The Xinanjiang-ET and SIMHYD-ET models incorporate remotely-sensed leaf area index (LAI) data obtained from the Advanced Very High Resolution Radiometer (AVHRR) on board NOAA polar orbiting satellites. Compared to the original versions, the Xinanjiang-ET and SIMHYD-ET models show marginal improvements in runoff simulations in the pre-plantation period (1882–1997). The calibrated Xinanjaing-ET and SIMHYD-ET models are then used to simulate plantation impact on streamflow in the post-plantation period. The total change in streamflow between the pre-plantation and post-plantation periods is −32.4 mm/a. The modelling results from the two models show that plantation reduces streamflow by 20.5 mm/a, and climate variability reduces streamflow by 11.9 mm/a. These results suggest that increase in plantations can reduce streamflow substantially, even more than climate variability.
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Li, H., Zhang, Y. & Wang, B. Separating impacts of vegetation change and climate variability on streamflow using hydrological models together with vegetation data. Sci. China Technol. Sci. 55, 1964–1972 (2012). https://doi.org/10.1007/s11431-012-4859-9
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DOI: https://doi.org/10.1007/s11431-012-4859-9