The primanry research on grouth dynamics of Aconitum leucostomum population

Aconitum leucostomum is a perennial poisonous plant growing in the mountain meadow of Yili River Valley, Xinjiang and already seriously affects the development of animal husbandry. The height (H), density (D), diameter of bunch and aboveground biomass of A. leucostomum were monitored every 15 days from May 3rd to July 17th to reduce the harmfulness of this poisonous plant. The growth process of A. leucostomum was simulated by the monadic nonlinear curve. The relationship between the height, density, diameter of bunch and the aboveground biomass was used to establish the equations using stepwise regression analysis. This study indicated that the height, diameter and aboveground biomass increased with the increase of growth time, and the increase models were the power function model, Longmodified model and power function model as following: H = 4.697 8T 0.513 551, Z = (494.177 6+231.510 6T)0.339 913, W = 2.639 3T 0.781 408. The density of A.leucostomum firstly increased and then decreased, the increase model was compartment model: D=114.7676e(0.005 049T)100.859 2e(0.0957 65T). Meanwhile, relationship between aboveground biomass and height and diameter of bunch was significant regression: W=39.781 436 4+5.429 432 775H 7.108 936 940Z. The height was important factor affecting abovebiomass of A. leucostomum. This study proposed that the harmfulness of A. leucostomum would be controlled by regulating its height.