A Study On The Seasonal Growing Dynamics Of Exotic Plants

In this paper, a research was made on the seasonal growing dynamics of two exotic plants: Gaura parviflora and Altenanthera philoxeroides. Research contents include : the biomass of Gaura parviflora above the ground-, quantitative dynamics, the spreading pattern of seeds; the sexual procreation, nutritious propagation and spatial structure of Altenanthera philoxeroides. The results showing:(1)To Gaura parviflora , the biomass above the ground of one, the biomass of leaves and the biomass of stems get to the maximal number in June 25. The biomass of anthotaxies gets to the maximal number in July 20.(2)To Gaura parviflora ,the variational characteristics of the highness of stem and every component are: the highness of stercu the numbers of leaves and the numbers of anthotaxies all get to the maximal numbers in June 25, subsequently, the highness of stem and the numbers of anthotaxies continue to grow, but the numbers of leaves reduce rapidly.(3)The average number of anthotaxies of individual Gaura parviflora is 10.9,every anthotaxy breeds 134.23 flowerets and 126.75 seeds, the ratio of burliness and unburliness is 94.43% and 5.57%.(4)The spreading of Gaura parviflora ' seeds is influenced by not only the spreading law of itself, but also the velocity and the direction of wind and so on. the potential spreading radius of ecological station is 80-100cm.(5)The nutritional propagation is the main propagating mode of Altenanthera philoxeroides, in the end of growing season, individual Altenanthera philoxeroides can produce 4 level, 77.58 branches of nutritional propagation, the branches ofnutritional propagation are 254.82 branches and as 24.31 times as the branches of sexual procreation in 0.5sq.m.(6)The spatial structure of Altenanthera philoxeroides: the stolons can form the space network structure of hexagon or triangle by repeating divarications, the minimal space of being beared is the fan-shaped space of 25 , the best fitful angel is 60°.