有益土壤微生物施用對臺灣肖楠及羅漢松苗木苗期病害及介質性質之研究

Application Effects of Benefi cial Soil-Borne Microorganisms on Seedling Disease and Medium Properties of Taiwan Incense Cedar and Yew Podocarpus Seedlings

目前林業苗圃大都採用人工介質作為培育苗木的基質，所培育之苗木常因根域土壤缺乏有益微生物，出栽後無法克服立地的貧瘠環境而有造林失敗現象，因此培育帶有多重有益微生物的健壯苗木，是今後苗圃育苗作業的重要課題。本試驗於臺大實驗林溪頭苗圃培育臺灣肖楠與羅漢松苗木，分析施用3種有益微生物製劑對苗期病害及介質性質之影響，及分別對苗期病害之影響。旨在評估與建立苗圃育苗過程中施用有益微生物之作業方式，以培育質優又安全的林業苗木。結果顯示本試驗微生物施用雖對苗木生長沒有顯著影響，但施用後之土壤微生物性質則明顯優於未施用組，其中又以施用’B’處理對於游離固氮活性增高最具效應。而以臺灣肖楠疫病罹病率來說，在8種處理當中，施用微生物製劑’B’之臺灣肖楠苗木，罹病率有較低之趨勢。 Most forestry nurseries use an artifi cial culture medium as a matrix for nurturing seedlings. The plantation failure is usually caused by a lack of benefi cial soil-borne microbes in the rhizosphere. So cultivating seedlings with multiple benefi cial soil-borne microbes is an important issue in the future nursery operations. The experiments were conducted at Chitou nursery of NTU Experimental Forest. We analyze seedling disease rates, seedling growth rates, and medium properties, respectively, on Taiwan incense cedar (Calocedrus macrolepis Kurz var. formosana (Florin)) and Yew podocarpus (Podocarpus macrophyllus (Thunb.) Sweet var. maki) after applying three kinds of benefi cial microorganism products. The objective of this study is to assess the effects by application of benefi cial soil-borne microorganisms in the process of nursery practices, and to cultivate high quality and safe seedlings for forestation. The results of this study shown that microbial products had no signifi cant effect on the growth of these two seedlings, but soil microbial properties of the experimental group are signifi cantly better than those in the control group. Among the microbial products the application of the 'B' product increased the most for free nitrogenase activity. Comparison among eight treatments on Taiwan incense cedar, the phytophothora root disease rate from application of 'B' product is towards lower than the others.