不同浓度IBA对3种柽柳嫩枝扦插效果的影响

Effects of Different Concentrations of IBA on Softwood Cutting of Three Tamarix Species

柽柳属(Tamarix)植物具较强的固沙、抗旱和耐盐碱性,本研究以细穗柽柳(Tamarix lepto‐stachya)、柽柳(Tamarix chinensis)、多枝柽柳(Tamarix ramosissima)3种柽柳为研究对象,选择其当年生半木质化枝条为插穗,通过开展不同浓度的吲哚丁酸(IBA)处理试验,利用隶属函数法对3种柽柳扦插成活率、平均新枝长及苗高等指标进行综合评价,研究IBA浓度对3种柽柳扦插效果的影响,为柽柳扦插繁育提供参考。结果表明:不同浓度IBA处理后3种柽柳扦插成活率、平均新枝长、苗高均存在显著差异(P<0.05),其中成活率为多枝柽柳(68.75%)>细穗柽柳(63.89%)>柽柳(36.09%),平均新枝长及苗高均以柽柳最高,为14.12 cm和17.04 cm。3种柽柳嫩枝扦插所适用的IBA浓度存在差异,细穗柽柳、多枝柽柳采用500 mg.L^(-1)处理,即可达到较好的综合扦插效果,而柽柳需采用1000 mg.L^(-1)。

Tamarix plants have strong sand fixation,drought resistance and saline-alkali resistance.In this study,Tamarix leptostachya,Tamarix chinensis and Tamarix ramosissima were selected as the research objects.The semilignified branches of the same year were selected as cuttings,and the survival rate of cuttings,average new branch length and seedling height of three kinds of Tamarix were comprehensively evaluated by using the membership function method through IBA treatment experiments with different concentrations.The effects of IBA concentration on the cuttings of three kinds of Tamarix were studied to provide reference for cuttings breeding of Tamarix.The results showed that according to the membership function method,there were significant differences in the survival rate of cutting,average new branch length and seedling height of three Tamarix after IBA treatment with different concentrations(P<0.05),among them,the order of survival rate was Tamarix ramosissima(68.75%)>Tamarix leptostachya(63.89%)>Tamarix chinensis(36.09%),and the average new branch length and seedling height of Tamarix chinensis were the highest,which was 14.12 cm and 17.04 cm.There were differences among IBA concentrations applicable to three kinds of Tamarix for softwood cutting.The treatment of 500 mg.L^(-1) for Tamarix leptostachya and Tamarix ramosissima can achieve a better cutting,while 1000 mg.L^(-1 )is required for Tamarix chinensis.