蔗渣基质对云南松种子育苗的影响

种源和栽培条件是决定云南松Pinus yunnanensis生长优劣的关键因子。本研究旨在挑选出适合云南松种苗培育的甘蔗Saccharum offinarum渣基质和森林土的配比方案。将制糖过程中的废弃物蔗渣与森林土按不同比例混合（0：100，10：90，20：80，30：70，40：60，50：50，60：40，70：30，80：20，90：10和100：0）．比较不同配方的蔗渣基质对云南松种子萌发出苗和幼苗生长的影响。结果表明。基质中的蔗渣体积分数为40％，50％和60％时，云南松种子萌发率最高，蔗渣体积分数超过60％后，随蔗渣体积分数升高。极易发生虫害，出苗率急剧降低：而出苗以后，适宜苗高和地径生长的营养土配方是体积分数为50％．70％和80％蔗渣基质。较高的蔗渣体积分数虽有利于幼苗生长，但出苗是关键，蔗渣体积分数为50％的处理既有利于种子萌发又有利于幼苗生长．是云南松种子蔗渣基质育苗最佳的配比方案。图4表2参12

Cultivating Pinus yunnanensis seedlings with bagasse substrates

Pinus yunnanensis is one of the main afforesting tree species in Yunnan Province. Two key factors of determining the growth of P. yunnanesis are provenances and cultivating condition. The aim of this experiment was to select the suitable proportion of bagasse and soil for P. yunnanensis seedling cultivation. Germination rate and seedling growth of the pine were studied by planting in the substrates with 11 levels （the volume rates of bagasse and soil were0： 100, 10：90, 20： 80, 30：70, 40：60, 50： 50, 60： 40, 70 ： 30, 80 ： 20, 90 ： 10, and 100 ： 0）. The results showed that the germination rate was the highest when the substrate within 40%, 50%, and 60% bagasse but when the percentage of bagasse is over 60% the rate dramatically decreased with the bagasse proportion gradually increasing. The growth, including height and ground diameter of P. yunnanensis was the highest when the substrate including 50%, 70%, and 80% of bagasse. That indicate the suitable proportion of substrate is 50% bagasse in soils for both seed germination and seedling growth of the species. Ch, 4 fig. 2 tab. 12 ref.]