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

我们观察到的菌根状况的扁柏（Chamaaparis obtusa）幼苗自然提出的粗木质残体（树桩或倒下的日志）在两个城市。在这两个城市，这些幼苗的根系高度感染丛枝菌根真菌和菌根定殖率是没有太大的差异，从相邻的矿质土壤上提出的幼苗。但苗木当年叶片氮浓度与菌根侵染率相关性不显著，菌根侵染对氮素营养的促进作用尚不清楚。至少，粗木质残体并不排斥或限制丛枝菌根真菌的活性，菌根真菌的作用可能与土壤中的相同。木质残体通常被认为是扁柏自然更新的安全场所，我们发现了一个新的事实，即其菌根潜力。因此，必须进一步观察，以澄清菌根真菌对扁柏自然更新的作用，特别是在其营养贡献的意义。

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.