Chloris virgata is an annual tuft grass which is more alkali tolerance. According to the investigation and the analysis of natural Ch. virgata population of alkalization meadow in the Songnen plain of China, the best correlations among simulated functions were selected to be the specifiitics of intraspecific competition and density dependence of the population in this paper. The results showed that there were the power function y = ax-b between mean tuft weight and the tuft density;the power function y = ax...