不同基质、遮光度及采样时间对云南拟单性木兰的扦插生根效果

Effects of different media,shading degrees and sampling time on rooting rate of cutting propagation of Parakemeria yunnanensis

【目的】探讨不同基质、遮光度和采样时间扦插的云南拟单性木兰插穗的生根效果,为云南拟单性木兰繁殖育苗提供参考依据。【方法】2013年6、10月和2014年1、3月,将半木质化云南拟单性木兰嫩枝插穗在珍珠岩+泥炭土(3∶1)、珍珠岩、河沙、河沙+珍珠岩(3∶1)和椰糠基质上分别进行20%、50%和80%3种遮光度扦插试验,统计其生根和成活情况,分析不同基质、不同遮光度、不同采样时间对其生根效果的影响。【结果】扦插基质以珍珠岩+泥炭土(3∶1)较佳,扦插生根率达21.9%,生根数达2.1条,根长达1.8 cm;遮光50%条件下生根率最高,分别比遮光度20%、80%和对照高2.1%、13.6%和17.7%;1月采样的生根率最高,分别比3、6和10月采样的高9.4%、21.9%和24.0%。【结论】云南拟单性木兰扦插育苗以1月采样,在珍珠岩+泥炭土(3∶1)和50%遮光条件下扦插生根效果最佳。

【Objective】The effects of different media,shading degree and sampling time on cutting rooting rate of cutting propagation of Parakmeria yunnanenisis were studied to provide references for breeding seedling of Parakmeria yunnanenisis. 【Method 】Taking semi-lignified tender twigs of Parakmeria yunnanenisis as material, rooting and survival conditions of cutting seedlings were explored using pearlite ＋ peat soil（3∶1）, pearlite, river sand, river sand ＋ pearlite（3∶1）,coconut chaff as mediums,under 20%, 50% and 80% shading degree in June 2013, October 2013,January 2014 and March 2014. The effects of different media, shading degrees and sampling time on cutting rooting were analyzed.【Result】The suited medium was pearlite ＋ peat soil（3∶1）,in which rooting rate was 21.9%,root quantity was 2.1 and root length was 1.8 cm. The suited shading degree was 50%, in which rooting rate was 2.1%,13.6% and 17.7% higher than 20% and 80% shading degree. The suited sampling time was January,in which rooting rate was 9.4%,21.9% and24.0% higher than that in March,June and October. 【Conclusion】Parakmeria yunnanenisis has the best cutting rooting effect when sampled in January,using perlite and peat soil（3∶1）as medium and under the condition of 50% shading degree.