Stream size influences stream temperature impacts and recovery rates after clearfell logging |
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Authors: | John M Quinn Aslan E Wright-Stow |
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Institution: | National Institute for Water and Atmospheric Research, PO Box 11115, Hamilton, New Zealand |
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Abstract: | Water temperature has profound effects on stream ecosystems. We studied effects of clear-fell logging Pinus radiata plantations on mid-summer water temperatures and recovery times in streams with 2–12 m wide channels. Post-logging increases were 2–3.8 °C for summer daily means and 4–7.3 °C for summer daily maxima. Rates of recovery of thermal regimes after logging were strongly negatively correlated with stream size, as indexed by catchment area, channel width or baseflow (r2 = 0.80–0.93). Summer daily mean and maximum temperatures declined during the riparian vegetation regrowth phase by 0.18 and 0.47 °C year−1, respectively, for the largest stream and 1.4 and 1.9 °C year−1 in the smallest stream. Thermal regimes were restored in small streams (2–4 m wide channels) about 6–8 years after clearfelling. In medium-sized streams (6–12 m wide channels), we predict this recovery will take 12–16 years. |
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Keywords: | Stream Cooling Logging Temperature New Zealand Riparian buffer |
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