THE MODELS ON DENSITY DEPENDENCE TO NATURAL SUAEDA HETEROPTERA POPULATION OF ALKALIZATION MEADOW IN THE SONGNEN PLAIN OF CHINA
松嫩平原碱化草甸天然翅碱蓬种群的密度制约模型

Suaeda heteroptera is an annual herb of Chenopodieceae which is the most tolerant to alkali. According to the investigated data of random sampling in single species community, density dependence of the characters of natural S.heteroptera population alkalization meadow in the Songnen Plain of China we- re analysed. The results showed that the models of density dependence in di- fferent growth stages and on different quantitative characters of the population could be more presented by many functional forms. But in this paper, the model of density dependence of a certain attribute of the population were represented by the best correlation equation among the functions. The density dependence of the population showed that function form was the hyperbola function y=a b/x for both mean weight per plant in the booting stage and fruits weight per unit area; that the power function y=ax~(-b) was for mea weight per plant in the ripening stage, mean weight of fruits per plant, mean number of seeds per plant and seeds number per unit area; and that the hyperbola function y=1/(a bx) is appropriate for above-ground biomass of the population in the booting stage and the logarithmic function y=a-b ln x in the ripening stage.