Analysis On The Timber Assortment And Growth-yield Model Of Prediction For Natural Broad-leaved Forests In North Fujian

The paper taked the natural broad-leaved forest in North-Fujian as the research object, with the data of provincial forest resource inventory by the150fixed sample plots,1823sample trees made materials data,69sample plots and128biomass sample trees, using the statistical software SPSS operation platform, by the theory and technology method of forest mensuration, forest management, forest resource asset evaluation method etc., the paper analysised the law of the timber assortment structure, the merchantable volume model, the whole stand growth-yield models, biomass estimation model, shrub and herbal biomass model, also including the growth-yield model with the interval.Meanwhile, the paper also analyzed the application of assets evalution of the natural broad-leaved forest and discussed the change of the asset assessment under the different circumstances. It had the important practical value on dynamic monitoring of forest resources, management, assets evaluation and the calculation of carbon reserves measures in the north Fujian province. The main research content and summary are as follows:(1) Using the sample timbers on the spot which analysed the law of diameter grade timber assortment structure, On this basis, the paper chose the proper equation which builded the volume ratio model of timber assortment and compiled the two dimension merchantable volume yielding volume rate tables. In order to facilitate the production and application, after that the tree height curve model was been established, the one dimension merchantable volume yielding volume rate tables had been exported by the two dimension merchantable volume yielding volume rate tables.Analysing the plant timber assortment structure rules by the related data, the paper taked the stand average diameter and average height as the auxiliary variables, and employed the joint estimation method which used to solve the volume model incompatible.Meanwhile, the stand of volume ratio model was constructed by using the immune evolutionanry algorithm to calculate the model parameter.Through tested, the volume ratio model had been higher precion and had practical value in forestry production.The paper discussed technical method for fomating the stand of volume ratio table by application of the tape equation, Weibull distubition function, the relative tree height curve model, and some other auxiliary equation.(2)Using the sample data, the stand growth model was been established and then the forecast method was put forwarded. Considering the difffrenence of site class which would be effected the result, the research putted the site classes dividing into four grades. Taked the rank as the dummy variable, the site class index model was conctructed. The whole stand model of the Volume model, the basal area model, the average breast height-diameter and the average height etc. including the natural sparse model which was inferred could be brought about continuous prediction and dynamic updating for natural broad-leaved forest resources.(3)Using the joint estimation to solve the problem that the biomass models of each compoents was not compatiable, the immune evolutionanry algorithm had been used for the model parameters.the model estimation of tree biomass, the understory shrubs, herbaceous biomass models in North-Fujian province were constructed and the tree biomass table were drew up.(4) The technology building natural uneven-aged forest growth model by using the prediction interval instead of the stand age were established. Considering the difffrenence of the site class that would be effected the result, the stand growth and yield model taken the interval as the main auxiliary factor were established throught incorporating the dummy variable including the site quality variable, and to estimate the model parameters by the ant colony algorithm, what provided a new technical approach for formatting the natural uneven aged forest growth and yield prediction model.It offered technical support to establish the model of natural uneven age forest by the prediction interval instead of stand age for application of natural broad-leaved forest assets evaluation selection cutting income method.On the basis, the assessment technique for the assets of natural broad-leaved forest were be discussed, and also analyzed the impact for the forest assets valuation by the change of selective cutting intensity and the rate, which can be improved the asset assessment for forest resources, especially provided the theoretical basis for the accuracy of natural uneven aged forest asset assessment.