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The influence of western hemlock and western redcedar on microbial numbers, nitrogen mineralization, and nitrification

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Summary

Microbial numbers in the forest floor and mineral soil (Al horizon) under large individual western hemlock (Tsuga heterophylla) and western redcedar (Thuja plicata) trees were compared. The lower pH and base saturation of hemlock samples was associated with higher fungal spore counts while cedar samples had higher total microbial counts and populations of ammonium oxidizing bacteria. Nitrogen mineralization rates were greater in laboratory incubations of hemlock soil but nitrification was only observed in incubations of cedar soil. These differences in nitrogen mineralization and nitrification are aspects of species-specific nutrient cycling regimes.

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Turner, D.P., Franz, E.H. The influence of western hemlock and western redcedar on microbial numbers, nitrogen mineralization, and nitrification. Plant Soil 88, 259–267 (1985). https://doi.org/10.1007/BF02182452

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  • DOI: https://doi.org/10.1007/BF02182452

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