Abstract
Background and aims
General theory of forest floor dynamics indicates convergence of properties during detrital decomposition. This study examined the hypothesis that nutrient stoichiometry, i.e. the relative amounts of nutrients, converges during litter decomposition.
Methods
Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) and red alder (Alnus rubra Bong.) foliar litters that decomposed in their respective forests were analyzed for N, P, Ca, Mg, K, S, Mn, Fe, Zn, and Cu. A novel approach quantified the stoichiometric difference as the angle between nutrient vectors. The approach was also used to synthesize data from 11 previously published studies representing a broad array of litter types and locations.
Results
The stoichiometries of the Douglas-fir and red alder litters converged during the first 2 years of decomposition, but diverged in the subsequent 4 years. This temporal trajectory was explained by two competing sets of processes: stoichiometric convergence occurs when different litters decompose in the same environment, and divergence occurs when the same litter decomposes in different environments. Manganese, Fe, and Ca were important contributors to stoichiometric differences.
Conclusions
Stoichiometric convergence processes often dominate over divergence processes. Consideration of multi-nutrient stoichiometries may enhance the understanding of the functions of litter, including rates of decomposition and relative rates at which nutrients are released.
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Abbreviations
- LSD:
-
Least significant difference
- PCA:
-
Principal components analysis
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Acknowledgements
Dale Cole provided the opportunity to conduct the study. Jana Compton performed the nutrient analyses. Many researchers performed and published detailed studies, which formed the basis of the synthesis. Jeff Hatten and two anonymous reviewers provided useful comments on earlier versions of this manuscript.
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Responsible Editor: Harry Olde Venterink.
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Homann, P.S. Convergence and divergence of nutrient stoichiometry during forest litter decomposition. Plant Soil 358, 251–263 (2012). https://doi.org/10.1007/s11104-012-1174-y
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DOI: https://doi.org/10.1007/s11104-012-1174-y