不同基质对亚美马褂木嫩枝扦插生根的影响

Effects of Different Substrate on Rooting of Softwood Cutting of Liriodendron sino-americanum

亚美马褂木为优良的园林绿化和生态造林树种,但扦插生根难限制了其大规模推广应用。研究了不同基质对亚美马褂木嫩枝扦插生根的影响,并着重分析基质温度和pH值与生根率的关系。结果表明,亚美马褂木嫩枝扦插生根率和腐烂率在7种基质组合间存在极显著差异,其中,红土:蛭石:珍珠岩=1:1:1时,扦插生根率最高为62.97%,超过不同组合平均生根率38.87%;腐烂率最低为29.14%,低于不同组合平均腐烂率45.80%,且基质重量较轻。适宜亚美马褂木嫩枝扦插的基质种类应偏酸性。苗床表面温度保持为31℃时,基质温度、基质与苗床表面的温差与生根率呈显著负相关,与腐烂率呈极显著正相关。因此,红土:蛭石:珍珠岩=1:1:1的基质组合较适宜亚美马褂木嫩枝扦插。

The Liriodendron sino-americanum,an excellent species for landscaping and ecological afforestation,faces promotion challenges due to the difficulty in rooting from cuttings,which limit its widespread application.This study explored he effects of different substrates on the rooting of softwood cutting of L.sino-americanum,with an emphasis on the relationship between substrate temperature,pH value,and rooting rate.The results showed significant differences in rooting rate and decay rate of cuttings among seven substrate combinations.When using a substrate combination of red soil,vermiculite,and perlite in a ratio of 111,the rooting rate of cuttings was the highest at 62.97%,higher than the average rooting rate of 38.87%across seven substrate different combinations;the decay rate was the lowest at 29.14%,lower than the average decay rate of 45.80%for different combination,and the the weight of substrate as relatively light.The type of substrate suitable for softwood cuttings should be acidic.Correlation analysis showed that when the surface temperature of the seedling bed maintained at 31℃,substrate temperature,and temperature difference between substrate and seedling bed surface were negatively correlated with rooting rate of cuttings,and extremely significant positive correlation with rot rate of cuttings.Therefore,a substrate combination of red soil,vermiculite,and perlite in a 111 ratio is more suitable for L.sino-americanum softwood cuttings.