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本文采用Logistic方程刻划了加拿大杨插条苗和紫穗槐、刺槐、沙棘播种苗的当年高生长节奏性。结果表明,这几种主要林业用苗的年高生长规律均能很好符合“S”型生长曲线,均属全期生长类型。其56—73％的高生长量在速生期内完成。从理论上探讨了苗木在一年内的整个生长过程中的三个不同时期,即速生期之前、速生期和速生期之后,提出了划分生长期的时间长度和苗高指标,为苗期的科学管理提供了理论依据。
In this paper, Logistic equation was used to characterize the high growth rhythm of poplar seedlings and Amorpha fruticosa, acacia and seabuckthorn seedlings in Canada. The results showed that the annual height growth patterns of these major forestry seedlings all fit well with the “S” growth curve, all of them were of the full-growth type. Its 56-73% of high growth in the fast-growing period completed. This paper theoretically explored three different periods of seedling growth throughout the year, that is, before the fast-growing period, fast-growing period and fast-growing period, put forward the time length and seedling height index of the growing season, which is the seedling science Management provides a theoretical basis.