牛樟 (Cinnamomum kanehirae Hayata) 為臺灣特有之珍貴樹種，苗圃扦插苗培育成 效相當良好，但野外造林成活率低且易發生生長遲滯之情形，推測與育苗過程之無菌介質 有關。本研究為解決牛樟扦插苗造林之困境，針對臺灣地區人工及天然牛樟林土壤根域進 行菌根菌調查，以期將來提供牛樟造林作業之參考，並提高造林之成效。結果顯示14個牛 樟林樣區內調查共計12屬21種叢枝菌根菌， 以Glomus deserticola、Acalospora mellea、 Septoglomus constrictum及Sclerocystis rubiformis分佈最廣。優勢菌種經純化繁殖後接種於 牛樟無菌苗， 牛樟扦插苗育苗初期13週後， 結果顯示菌根可促進淨高生長、全株乾重、 S/R 率、菌根依存度等功效。

Cinnamomum kanehirae Hayata is an endemic precious tree species in Taiwan. The growth of cultivation by cuttings in nursery was quite good but the survival rate of plantation was low and prone to the situation of growth retardation. We speculated that the cultivation medium of seedlings lacking of mycorrhiza was the reason for the low survival rate. To solve the plantation dilemma of C. kanehirae cuttings, this study investigated arbuscular mycorrhizal fungi composition in artificial and natural forest of C. kanehirae in central Taiwan. In this study, a total of 14 sampling locations with 3 soil-samples in each location were collected from the tree rhizome nearby (i.e., 42 samples in total) during 2013 to 2014. A total of 12 genera with 21 species of arbuscular mycorrhizal fungi were found in central Taiwan, and the predominant species are Glomus deserticola, Acalospora mellea, Septoglomus constrictum, and Sclerocystis rubiformis. The three dominant fungi of Acaulospora mellea, A. morrowiae and Septoglomus constrictum were pure-cultured and then inoculated into C. kanehirae rooted cuttings, respectively. Thirteen weeks later, we found that the growth performance, net height growth, total dry weight, S/R ratio, and mycorrhizal dependency were all significantly different between inoculated and control cuttings.