Correction And Implementation Of Stand Growth And Yield Model In Heilongjiang Province

The stand growth and yield model plays an important role in forest management. The management measures of stand growth process (such as thinning, fertilization and so on) are implemented and the forest pests and diseases may occur, will have an impact on the stand growth. Even if it is the optimal prediction model, it is not applicable to the stand of long-term any more. To solve this problem, proposed a modified method. That is to modify some initial parameters of the original model which is in the same study area with the same stand and the model form unchanged, in order to keep the updated model consistented with the actual growth in forest harvest. The model correction method is divided into three steps. Through the steps of the model parameters sovled, model test and model deep correction, achieve the model updated. Until the error is less than the set threshold and the abnormal datas are less than the half of the actual datas, stop updating. Now the obtained parameter values are the required.This research takes Heilongjiang Province Meng Jia Gang National Experimental Forest of Korean pine plantation as the experimental object, collected73block which is in Meng Jia Gang business areas without obvious damage of different site conditions and which standard canopy density of is more than0.5, and then do a set of experiments, by contrast experiment using SPSS software to fit model and using the correction method to update model, verify the feasibility and effectiveness of the model correction method. Experiments show that, stand basal area model using SPSS software to fit effect than the correction method of correction results slightly better, stand tree height model and stand volume model are the correction method more better, therefore, correction method of fitting results better than SPSS software.The research takes the main forest types in Heilongjiang Province as the object, using the "model of the whole stand growth and yield of main forest types in the local standard of Heilongjiang province city county forest harvest table" as the prediction model of this research. By using JAVA language and SSH framework technology develop the system. The system has two major functions. One is the estimating function of stand growth and yield model, the other is updating the stand growth and yield models function. the modified method is applied to the application of Web platform, will expand the scope of stand growth model’s research and application.