Simulation Of Competitive Mechanism And Growth Dynamics Of Juvenile Amur Linden Plantation

The above- and underground competition mechanism of amur linden (Tilia amurensis Rupr.) seedling, the dynamic model about competition and growth of the young plantation, and its application were researched in this paper. The competition between plants had been conceptualized as a continuum process of resource depletion, mainly referring to underground competition (UC), and resource preemption, mainly referring to aboveground competition (AC). With the data of control experiment, aboveground, underground and total competition (TC) indexes were made with its biomass of subject tree and its competitors and the distance between them. And UC, AC and TC all decreased dramatically as increasing of distance between seedlings. The result of path analysis showed that the AC has greater effect on the TC and the total biomass (TB) than the UC in pure plot of Amur linden. In mixture plot of Amur linden and larch (Larix spp.) the maximum effect to amur linden come from larch抯 UC and the minimum from amur linden抯 UC. The most researches of forest in field use individual model between competition and growth. We used interference model to study individual growth and stand dynamic of Amur linden plantation. The interference model, as an individual static model, has higher multiple correlation coefficient (MCC) than the exponent model. The stand dynamic model, which chose the first year抯 basal area (BA) and the distance-dependent competition index as independent variable and the second year抯 BA as dependent variable, was brought forward based on the individual static model. The model had higher MCC and predicted precision, since it can reflect the dynamic relationship between future growth, present growth and competition status in amur linden plantation. The Monte-Carlo method was applied to simulate stand thinning. All models were programmed with the computer language Visual C++ 6.0, which can predict the future growth including DBH, height, tree volume, total volume and crown closure of stand, and can assess some forest culture methods. The simulated experiment on computer may display stand dynamics. The research provided base for further simulating and analysis forestry ecosystem management.