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Quantification of the effect of forest harvesting versus climate on streamflow cycles and trends in an evergreen broadleaf catchment.

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<mark>Journal publication date</mark>25/04/2016
<mark>Journal</mark>Hydrological Sciences Journal
Issue number9
Number of pages12
Pages (from-to)1716-1727
Publication StatusPublished
Early online date11/03/15
<mark>Original language</mark>English


A new method known as Unobserved Component – Dynamic Harmonic Regression (UCDHR) was applied to a 39-year record of rainfall and streamflow for three sub-catchments of the Sarukawa Experimental Watershed in southwestern Japan. Some 25% of the timber was harvested from one of the sub-catchments in May-July 1982 and the objective was to quantify the magnitude
of this effect relative to the effects of climate cycles (e.g. Southern Oscillation Index). The observed effects of inter-annual climate cycles (i.e., 0.89-1.36 mm/d) were seen to be comparable (i.e., 0.70-1.17 mm/d) to the effects of harvesting 25% of the standing timber. This result underlines the importance of always quantifying the effect of climate on streamflow response when harvesting
impacts are studied.