Abstract: Path analysis of four morphological parmeters of Convolvulus tragacuthoiedes shows that crown(C) contributed most to the population biomass,followed by branch number(BN), base diameter(BD)and height(H).Variable CH and D²H were used to build empirical models to compare the efficiency of biomass modeling,and the predicting equations for biomass of vegetative organs and individual plants were built.The result suggest that the models built on CHwere more appropriate than those on D²H, and the linear equation had the highest accuracy among the models.The optimum equation for predicting the individual biomass was: Y =12.10+0.0105 CH (R=0.983,P<0.01).

Key words: Convolvulus tragacuthoiedes, Morphological parameter, Path analysis, Biomass modeling, self-learning, site selection, ecological value, Daiyun Mountain, tabu search, nature reserve