Litter and forest-floor dynamics in aPinus resinosa plantation in Wisconsin |
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Authors: | J G Bockheim J E Leide |
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Institution: | (1) Department of Soil Science, University of Wisconsin, 53706 Madison, WI, USA |
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Abstract: | Summary Breakdown of dry matter and release of nutrients from decomposing leaf litter and forest-floor material were measured in a
34-year-old red pine (Pinus resinosa Ait.) plantation in central Wisconsin using (1) leaf-litter bags (2) litterfall and forest-floor nutrient data and an exponential
decay function, and (3) nutrient flux data and a mass balance equation. After one year of decomposition, 77% of the original
dry matter in leaf-litter bags remained. The release of macronutrients in decomposing leaf litter was K>Mg>P, S>N>Ca, and
the release of micronutrients and aluminum was Mn, B>Al>Cu>Zn. Nitrogen in decomposing leaf litter showed the leaching, accumulation,
and final release phases delineated by Berg and Staff4. Half-lives of dry matter and nutrients in the forest floor ranged from 0.5 (K) to 39 (Al) yr. Forest-floor turnover rates
of the various elements followed the same trends as in leaf-litter bags except that Ca turned over more readily than P, S,
and N and Zn turned over more readily than the other micronutrients. A forest-floor nutrient balance sheet confirmed that
the macronutrients N and Ca are accumulating most readily in the forest floor. The overall implications of these trends for
tree nutrition are discussed. |
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Keywords: | Decay constants Litterfall decomposition rates Nutrient cycling Nutrient release Red pine |
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