不同基质与激素对北美红杉嫩枝扦插生根的影响

Influence of Substrate and Plant Growth Regulators on Rooting of Tender Cutting of Sequoia sempervirens

对北美红杉当年生半木质化枝条采用3种基质26种处理的扦插试验表明:不同扦插基质对北美红杉的生根率、根长、根径及生根条数均产生显著影响.以4号基质(河沙∶泥炭=2∶1)扦插效果最佳,其次是12号基质(珍珠岩∶泥炭=2∶1),6号基质(山地红壤∶腐殖质土=2∶1)效果最差.试验还表明用植物激素处理北美红杉枝条,不同种类的激素及其浓度对应不同扦插基质的生根效果也不相同.4号基质以ABT30.075g/kg浸泡插穗基部2h的效果最佳,其次为NAA0.075g/kg;12号基质以ABT10.075g/kg效果最佳,其次为IBA0.1g/kg.

It is demonstrated by cutting experiment of Sequoia sempervirens.with semi-lignified branches treated by 3 kinds of substrate and 26 treatments of plant growth regulators that both of the substrates and plant growth regulators had significant influence on rooting ratio, length and diameter of the roots and the quantity of the new roots. Substrate No. 4(river sand∶peat=2∶1) got the best result, followed by substrate No.12(perlite∶peat=2∶1), while substrate No.6(mountainous red soil∶humus soil=2∶1) got the worst result. It is showed that the types and concentrations of plant growth regulator led different cutting results. Cutting did in substrate No.4 two hours after the tender branches had been soaked in 0.075g/kg ABT3 obtained the best result, the same combination altered by 0.075g/kg NAA as plant growth regulator ranked the second. Cutting did in substrate No.12 two hours after the tender branches had been soaked in 0.075g/kg ABT1 showed very good result, followed by the same combination with alternative of 0.1g/kg IBA as plant growth regulator.