桢楠林下改土与遮阴对白及组培苗生长的影响

Effects of Soil Improvement and Shading on the Growth of Bletilla striata Tissue Culture Seedlings under Phoebe zhennan Forest

为探索适宜于白及组培苗在川中丘陵区桢楠林下的生长模式,分别以松针土和遮阴方式为因素,研究白及组培苗在林下的存活和生长情况。结果表明:(1)采用松针土改土半年后,能显著提高白及组培苗成活率,改土1年后,白及主要生长性状均超过原土,其中以添加60 kg·m^(–2)的松针土量效果最佳。(2)6月底至10月初,采用遮阴处理,有利于林窗部位白及的正常生长,其中以林下水平悬挂高度为1.5 m、遮阳率60%的遮阳网效果最佳,平均苗高、平均叶数、平均假鳞茎直径等性状均显著高于拱棚式样遮阴和对照。

In order to explore the suitable growth model of Bletilla striata tissue culture seedlings under the Phoebe forest in hilly areas of central Sichuan,the survival and growth of Bletilla striata tissue culture seedlings under the forest were studied using pine needle earth and shading methods.The results showed that:(1)The survival rate of Bletilla striata tissue culture seedlings was significantly improved after half a year of soil improvement with pine needle earth.After one year of soil improvement,the main growth traits of Bletilla striata were all higher than those of the original soil,and the best way was adding 60 kg/m^(2) pine needle earth.(2)From the end of June to the beginning of October,shading treatment was beneficial for the normal growth of Bletilla striata in forest gaps,among which the shade net with 1.5 m horizontal hanging height and 60%shading rate was the best,and the seedling height,average leaf number and average pseudobulb diameter were significantly higher than those of arched shed shading and control.