Construction Of Theoretical Merchantable Volume Tables Of Cunning Lanceolata In Kaihua Forest Farm

In order to develop a forest management volume table, collect 36 random Cunninghamia Lanceolota stands surveyed, in different habitats in Kaihua forest in Zhejiang province, the area of each stand is 20m×30m, in addition to conventional standards investigation, selected the average trees as the analytical wood in each diameter class and height class, total of 72 analytical trees, measured the diameter with and without the skin at the height of 0.2m,1m,1.3m,2m,3m,4m...and the bottom diameter of each analytical tree.52 analytical trees is used for the model construction, and the other 20 analytical trees is remained as test sample. Sub-area of 2 meters, according to the quadrate practice in the central section, the diameter with bark and no-bark in the central sub-district were measured.According to the measured data, use the software SPSS (Statistical Program for Social Sciences) to fit the tree height curves peeled prediction diameter and taper equation models as to the preparation of the Cunninghamia Lanceolota volume table. The results show that:the volume tables using the data of conventional analytical investigation of wood and computer theory bucking is in full compliance with requirements through the accuracy test and the selected taper equation has no significant systematic errors. This method has a solid theoretical basis and can be applied in the survey of forest resources and forest production.In order to check out more easily the volume table, using Visual Basic programming language design Cunninghamia Lanceolota volume ratio (volume) query interface, in the circumstances of known or unknown the distribution of diameter-classes, through programming to calculate the volume ratio, which can improve the work efficiency of forest managers and avoid the wastes due to the need of re-create the resources because of the changes in material specifications.Finally, the Cunninghamia Lanceolota of volume tables derived of taper equation, using the mathematical expression of correlation and regression analysis shows the relationship between the volume ratio and volume, with the accuracy comparison, the regression equation has a low error and a high precision, but its accuracy is slightly lower than the volume tables.