不同移栽基质对金钗石斛试管苗成活和生长的影响

目的] 研究4种移栽基质对金钗石斛试管苗成活率和生长的影响。方法] 以苔藓、锯木屑、树皮、腐殖土为移栽基质，观测移栽试管苗的成活率、株高、茎粗、根数、根长、干重并比较其差异性。结果] 移栽30 d的试管苗的成活率在锯木屑中达94.7%，在苔藓和树皮中达90%以上，在腐殖土中为77.7%；其株高在锯木屑中增加0.250 cm，在腐殖土中增加0.080 cm，其茎粗在苔藓中增加0.086 cm。移栽60 d的试管苗的株高在锯木屑中增加0.370 cm；其茎粗在腐殖土中增加0.210 cm，在苔藓中增加0.132 cm，在锯木屑中增加0.086 cm，在树皮中增加0.047 cm；其单株平均根数在苔藓中为5.1条，在腐殖土中为2.7条；其根长在锯木屑、树皮、苔藓和腐殖土中分别为4.6、4.2、3.7和3.5 cm，其全株干重在锯木屑中达16.33 mg，在树皮中为10.60 mg。结论] 锯木屑是用于金钗石斛种苗生产的最佳移栽基质。

Effects of Different Transplanting Media on the Survival and Growth of Test Tube Plantlet of Dendrobium nobile

Objective] The purpose was to study the effects of 4 transplanting media on the survival rate and growth of test tube plantlet of Dendrobium nobile.Method] With moss,sawdust,barks and humus soil as transplanting media,the survival rate,plant height,stem diameter,root number,root length and dry weight of transplanted test tube plantlets were observed and measured and their differences were compared.Result] After 30 d from transplanting,the survival rate of test tube plantlet growing in sawdust was up to 94.7%,that of test tube plantlet growing in moss and barks was higher than 90% and that of test tube plantlet growing in humus soil was 77.7%;its plant height was increased by 0.250 cm in sawdust and by 0.080 cm in humus soil and its stem diameter was increased by 0.086 cm in moss.After 60 d from transplanting,the plant height of test tube plantlet was increased by 0.370 cm in sawdust;its stem diameter was increased by 0.210 cm in humus soil,by 0.132 cm in moss,by 0.086 cm in sawdust and by 0.047 cm in barks;its average root number per plant was 5.1 in moss and 2.7 in humus soil;its root lengths were 4.6,4.2,3.7 and 3.5 cm resp.in sawdust,barks,moss and humus soil;its dry weight of whole plant was up to 16.33 mg in sawdust and was 10.60 mg in barks.Conclusion] Sawdust was the optimum transplanting medium for the production of D.nobile seedlings.