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就二龄美加黄杉（花旗松）实生苗的抗寒力问题,在三个冬期研究了电导、阻抗、形成层活性及顶端生长等的季节性变化。用-9.5℃冷冻16小时后,茎部扩散剂的电导及茎部阻抗与同一处理的盆栽植株的抗寒力密切相关。形成层停止和开始活动的时间和抗寒力升降时间十分一致。然而,以顶芽形成作为抗寒指标并不理想。扩散剂的钾浓度变化可引起电导季节性变化。将抗寒与不抗寒苗木装入塑料衬里的袋子,置于0—2℃无光条件下贮藏,抗寒性均无变化。
The seasonal changes of conductance, impedance, formation activity and apical growth were studied in three winters on the cold resistance of the second-age American Douglas fir (Douglas-fir) seedlings. After freezing at -9.5 ° C for 16 hours, the conductance and stem impedance of the stem diffuser were closely related to the cold hardiness of the same treated potted plants. Forming layer to stop and start activities of the time and cold resistance lifting time is very consistent. However, the formation of top bud as a cold indicator is not ideal. Diffusion of potassium concentration can cause seasonal changes in conductance. Will be cold and cold-resistant seedlings packed in plastic bags, placed in 0-2 ℃ light storage conditions, no change in the cold resistance.