The role of mycorrhizae in nutrient acquirement by Hinoki(Chamaecyparis obtusa) seedlings on fallen logs

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We observed a mycorrhizal status of Hinoki(Chamaecyparis obtusa) seedlings naturally raised on coarse woody debris(stumps or fallen logs) in two cites. In both cites, roots of those seedlings were highly infected by arbuscular mycorrhizal fungi and mycorrhizal colonization rate was not far different from that of seedlings raised on the adjacent mineral soil. However, nitrogen concentration of current year leaves of the seedlings were not significantly correlated with mycorrhizal colonization rate, thus advance of mycorrhizal colonization on the nitrogen nutrition was unclear. At least, coarse woody debris did not exclude or limit of the activity of arbuscular mycorrhizal fungi, and mycorrhizal fungi may perform same as in the soil. Woody debris is often thought as a safe cite of natural regeneration for Hinoki, and we showed a new fact of its mycorrhizal potential. Hereafter, further observation must be needed to clarify the role of mycorrhizal fungi on natural regeneration of Hinoki, particularly in the meaning of its nutritional contribution.