The thesis firstly studies the reaction rules of isocyanate with alcohol in room temperature in which some factors are discussed such as the concentration of alcohol and isocyanate, the mole ratio, acid, alkali, solvent, temperature.

We had the conclusion that the dynamic law of soybean of every character in bearing periods.

On basis of a census of all individuals of plant population of revegetation in 9 plots in mine spoils in Mufu mountains Nanjing,the size structure,spatial pattern,population density and population dynamics were analyzed for the species.

With the help of the relevant mathematical analysis approach,an investigation of dynamics of the forest resources based on the theoretical foundation of forest management was conducted with GIS used as a platform of system management.

Through the determination of yield of grass and aftergrass and observation of phenology dynamic and rainfall,the production capability and dynamic rule of grassland in Lingwu city are grasped,this provide technical parameter for the futur.