关键词: 裂叶沙参, 个体生长, 物候学, 逻辑斯蒂方程, 濒危物种

Abstract: In the fixed sample plot at different habitats, the growing process of an endangered species, Adenophora lobophylla Hong population was observed.The regulation of the adult individual growth and phenological characteristics was studied.The relation between time(x, day) and the total growth of biomass above ground(y, g) could be expressed:y=0.2872-0.0187x+0.0009x², and the relations between time(x, day) and the growth of biomass(y, g) of every organs such as branch, leaf, flower branch, flower bud, flower and fruit could be expressed by the general equation:y=b₀+b₁x+b₂x².During the time of rapid growth from April 10 to August 15, the relation between time(A, day) and the growth of total biomass of all organs above ground(B.g) could be expressed by Logistic equation:B=0.99/(1+e^(3.613-0.149A)); the relations between time(A, day) and the growth of biomass(B, g) of stem, flower branch could be expressed:B=K/(1+e^(c-r_m.A)).The regulation of growth of individual in the deciduous thorny shrub community were compared with that in grass(drought-resistant) community.The individual in the open grass community begins its growth(phenology) later and ends its growth earlier than that under shrub community.

Key words: Adenophora lobophylla, Individual growth phenology, Logistic equation, Endangered species