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采用定点连续观测方法，进一步探索了小黑杨扦插苗生长过程的连续性与阶段性的关系．结果表明，在齐嫩地区，小黑杨的苗高、地径、根系生长均可明显地划分为连生前期、速生期、速生后期3个阶段，并定量地确定了各阶段出现的具体时间和生产比例．为生产单位及时有效地加强苗期管理提供了理论依据．
Continuous point-by-point observation method was used to further explore the relationship between the continuity and stage of growth of Populus tomentosa cuttings. The results showed that the seedling height, root diameter and root growth of Populus simonii could be clearly divided into three stages, ie preimplantation period, fast growing period and late growing stage in Qinao region, and the specific time of each stage was quantitatively determined And production ratio. Provide a theoretical basis for the production unit to promptly and effectively strengthen the seedling management.