Characteristics Of The Life Cycle Form And Its Spectrum Of Artificial Community Of Pinus Svlvestris Var. Mongolica

The artificial community of Pinus svlvestris var. mongolica in the botanical garden of Northeast Forestry University was studied, and the plant life cycle form of different plants from this community including Pinus svlvestris var. mongolica, Picea meyeri, Acer negundo, Amorpha fruticosa, Syringa reticulate, Spiraea trichocarpa, Rubus crataegifolius, Taxus cuspidata Carduus crispus, Brylkinia caudate, Chelidonium majus, Inula lineariifolia, Lagopsis supine and Capsella bursa-pastoris were classified by PCA method. Based on this mathematical classification, the succession status and health condition of this community were assessed. For the canopy layer plants (Pinus svlvestris var. mongolica and Picea meyeri), the vegetative growth (V) accounted for 46%, the sexual reproduction (S) accounted for 35%, while the clone reproduction (C) accounted for 19%; Succession layer plants (Acer negundo, Amorpha fruticosa, Syringa reticulate, Spiraea trichocarpa, Rubus crataegifolius and Taxus cuspidata), V accounted for over 50%, and C accounted for a little higher than the S; Herbaceous layer plants (Carduus crispus, Brylkinia caudate, Chelidonium majus, Inula lineariifolia, Lagopsis supine and Capsella bursa-pastoris), V accounted for nearly 47%, which was only 4% higher than that of S, while C only accounted for 11%. These findings showed the plant life cycle form of canopy layer plants and herbaceous layer plants were VS transition type with V form as the main type, while the succession layer plants was V form. At the viewpoint of community, the life cycle form can be described as V_0.49S_0.33C_0.18, a typical VS transition type, which indicates that most of the species studied in this community are in a healthy status with the V form. Moreover, the relative high (33%) percentage in the S form indicates that the community also tends to sexual reproduction, but it will be steady within a period of time.