Study Of Crown Structure In Young Growth And Middle-aged Cunninghamia Lanceolata Forest

This paper combined with tree parsing, crown parsing, Pro/E model technology toresearch the crown structure of Cunninghamia Lanceolata. The paper Has set the standardsample plots in6,12,13,15,17years, and set fixed sample plots in6,8years. Havedetermined structure factor includ tree height (m), diameter at breast height (cm), the first livehigh branch (m), crown length (m), the crown breadth(m), the number of rounds, each roundof spacing (cm), primary branch number, primary branch length (cm), the branch Angle,primary branch diameter (base), primary branch diameter (at the position of1m height), theaverage branch corresponding to the secondary branch number and branch Angle, secondarybranch number, secondary branch number, secondary branch diameter (mm), the longestlongest length, length of tops, secondary branches (cm),the18factors are indicators, andfactors such as crown satisfactory degree, crown surface area, crown volume, crownproductivity is composite index). The paper is studied from various aspects to research theCunninghamia Lanceolata structural characteristics.The aspects include primary branches,secondary branch, branch branch location branch structure, branch structure, differentdirection,different branch Angle branch structure and so on, then studing the correlationbetween crown structure factor. Skeleton and on the basis of the Pro/E model successfullyimplement Cunninghamia Lanceolata visualization, using the matrix model of surfacestructure to measure the sample wood crown surface area and crown volume, found theskeleton based on Pro/E model of crown surface area and crown volume measuring resultsand based on the traditional mathematics method, and the result based on Pro/E model islower,and concludes that the traditional method in estimating cunninghamia lanceolata crownsurface area and crown size precision can meet the actual needs, and in the future study ofcunninghamia lanceolata crown can be regard as estimation of approximation of cone. On theother hand, using Pro/E method to calculate crown surface area and crown volume is moresimple, it can according to the experimental study of specific accuracy requirements, todetermine the sample specimen amount of field investigation, and on the basis of theoperability, ensures a higher scientific nature. Finally, studied the correlation between crownstructure and volume growth of Cunninghamia lanceolata, and the correlation between crown surface area and crown volume growth rate in average year and annual year, and the trunkvolume with the skin several years of growth, and the relationship between the averagegrowth rate, and construct the mathematical model between crown volume, crown surfacearea, crown productivity and crown volume.