Influence of canopy removal on oak forest floor decomposition

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Abstract
We compared leaf and forest floor mass loss rates over 2 years on undisturbed (NC), shelterwood-cut (SC0), and clear-cut (CC) sites in a Quercus forest at the Hardie's Creek Forest, Wisconsin, U.S.A. Litterbag techniques and a budgetary approach based on forest floor surveys and litterfall estimations were used. SC0 and NC variables did not differ until final harvest on SC0 (creating SC1). Over a 6-month period, 19% of initial cellulose (filter disk) mass was lost from litterbags placed on SC1 compared with 71% on NC. Leaf mass loss from litterbags was consistently slower on CC than on NC. Rates of mass loss to the upper (01) and lower (02) forest floor horizons in 1985 and total forest floor mass loss rate in both years did not differ among sites; mass loss rate for 01 was lower on CC than on NC, but higher for 02 in 1986. Differences in mass loss rates between CC and NC were attributed to changes in environment (ambient temperature and water content of the soil and forest floor) that were induced by clear-cutting. We suggest that the effects of canopy removal on mass loss from leaf litter appear to vary with regional climatic variables, while the effects on overall forest floor mass loss rate may be buffered by compensation among various forest floor horizons in most areas.