Study On The Ripe Age Of Masson Pine For Raw Material Papermaking

Ripe is a important technical and economic index to management in forestry, it is also the main foundation to determine whether the forestry is the right time for utilzation or not. For a long time, many studys have been done on various kinds of stand, especially in commercial forest, but there is few ripe research to the raw material papermaking of masson pine, as for the ripe research to wood character and biomass, it is still a blank. Masson pine, being the major species for papermaking in the south of China, it has important realistic and economic meaning to develop masson pine forest energetically, it will alleviating the pressure of raw material supply in pulp industry, as well as reduce large amount of foreign currency to import pulp every year. It is urgent to improve the level and apply science in management.The essences of the management and administration of commercial forest are to make their produce timber in large quantity, with excellent quality for control to the forest through people, realize that the economic benefits are maximized. To reach this goal, we should know well about the management. But the stand is a ecosystem with complicated structure and many related influence factors. Add to the long growth period long, it is difficult to carry out the proper management policy. Thus, the growth and obtain models must be established before making the proper manage decision, the structure and grow dynamic and obtain change rule of the stand will be grasped by the models. Then the manage type was made accordance to the site condition and economic index. The models of growth and harvest (the stand's site index model, the ssite index curl model, the stand area grow model, the average DBH model, the average height grow model, the stand volume model) have been made basing on the collect, investigate and analyze data.The chemical composition and the fibre form must be consider to decide whether that kind of fibre is suitable to certain kind of paper or not. This essay divides the impact on quality of material of timber of masson pine of the density through analysing the wood at first: The growth rounds of widths of timber, late wood it leads to be at basic densities basic characteristic who timber constructed, it influence timber in charge of afterbirth wait for other characteristics is thus not at to make thick liquid have a important bearing on papermaking timber by form. Analysis indicates that the basic density of the timber shows a tendency to increase as divide the increase of the density in the woods, but begin to drop after reaching certain limit. Grow wheel become narrow constantly as divide the increase of the density in the woods, late wood demonstrates the variation tendency of rising by rate.Fibre is a main component part which forms masson pine timber, account for more than 90% of the timber cells. To papermaking, in charge of fibre length and in charge of wall one than influencing papermaking the important indexes of quality. After reaching 0.3 mms and more than in length of fibre, manage a of foot-paths of afterbirth the larger, in charge of the apter it will be for the fibre to press routedly, interweave and level and smooth ones even better paper performance. Analysis indicate, at low densities relatively, woods divide into density with inning charge of the lengths of fibre present relevant, namely woods divide into heavy density andin charge of the longer fibre. The high density is shouldered relevantly. The variation tendencies of this kind of variation tendency and a round of widths of growing are just the opposite. There is to in charge of fibre what woodses divide into of density thickness and wallses than difference strong, But demonstrate increase of dividing into the density and variation tendency strengthened constantly with the woods basically.There is important influence in papermaking in the chemical composition of the timber. Analysis indicates that the regularity that the content of chemical composition of timber divided in different density woods changes i...