对美国山核桃(Carya illinoensis)进行不同粗度根段和不同ABT6浓度浸泡处理育苗试验,结果表明,各处理苗木高度、地径、出苗率均与实生苗对照表现出显著性差异,种根粗度减小,各指标均呈现下降趋势.>1.2～1.6 cm径级根段的出苗率和苗木地径最大,分别达到67.5%和0.52 cm,苗木高度则以>0.8～1.2 cm粗度径级根段最大,为14.98 cm,但无论苗木地径还是苗木高度均小于同期播种的实生苗,苗高仅为对照(31.40cm)的47.73%,地径仅为对照(0.72 cm)的71.68%.采用根段育苗虽可节省种子成本,但苗木生长相对较为纤弱,需培育多年才能达到当年实生苗的平均水平,且取根不易,不适于规模化扩繁.因此,从工效、成本和生长情况综合考虑,美国山核桃育苗应优先选择种子繁殖而非根段育苗.%Experiment was conducted on seedling cultivation by root of Carya illinoensis with different size of root and treated by different concentration of ABT6 in the demonstration bases of Jiande city, Zhejiang province. The results showed that the seedling height, basal diameter, seedling rate of treated by ABT6 had significant difference with the control, and had positive relation with diameter of mother root. Seedling rate and basal diameter from mother root of 0.8-1.2cm could top to 67.5% and 0.52cm. Seedling height reached 14.98 from mother root of 0.8-1.2. But basal diameter and seedling height form mother root was only 71.68% and 47.73% of that from seed. Compared to seedling cultivation by seed, that by root had disadvantages such as weak growth and difficult to get mother root. Therefore, seedling cultivation from seed was recommended.
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