| The Tree Volume table is one of the most important forestry management tables. Currently, there are several problems with the tree volume table that it can not meet the current requirements of the management of forest resources. This study aims to improve the preparation of volume table technology to improve the accuracy of volume table, and summed up a set of simple and effective method for the establishment of volume table.In the study 182 sample trees of Cunninghamia Lanceolota in Kaihua were selected for test. The trees were used as analytical trees (each diameter class and height class has one corresponding analytical tree), 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. According to the quadrature practice in the central section, the volume of trees can be measured.Based on previous researchesompared, different tree equations was selected to be compared. According to the relevant index and the reside standard deviations, finally we select the Dynamic Binary Volume Yamamoto type V=c0Dcl-c2(D+aH)Hc3+c4(D+bH)as the best two-entry tree volume equation of Cunninghamia Lanceolota in Kaihua forest. Also we obtained the optimal type of volume, root diameter volume model. The volume equations'accuracy meets the standard of volume equation, which means it can be actually used. We also tested the applicability of Theoretical Volume Equation conducted by Japan scholars and the results proved the theoretical volume equation with good accuracy, which once again proved the theoretical volume equation has a wide range of applications. The study provides a reference for establishing other volume tables in the future. |
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