The Variation Of The Artificial Larch And Pinus Sylvestris Internal Structure And Wood Density

In this study, the sample data was from dahurian larch (Larix gmelinii Rupr.) and Pinus sylvestnis mature plantations located in Qitaihe forest bureau in Heilongjiang Province. Including the age of the wood heartwood, sapwood ages, the length of the radius of the heartwood the sapwood width value and bark thickness equivalents determination analysis larch and Pinus sylvestris trunk internal constitute and compare heartwood, sapwood and bark of various indicators and trunk of each factor between variation and correlation, and many other aspects of elaboration. Wood basic density and growth ring width growth variation detailed study using the variance analysis, multiple comparison, regression analysis and correlation analysis and so on, we study the variation situation of the larch microscopic and Pinus sylvestnis properties within the tree and between the trees among radial variation, variation along the direction of the trunk and the rings group correlation. Real measured values heartwood and sapwood finishing, larch and growth characteristics of Pinus sylvestris heartwood and sapwood. Heartwood radius and the radius of the cambium than sapwood, the sapwood width cambium radius ratio and the share of the suitability of larch and Pinus sylvestris early look at the trunk vertical distribution of the proportion of relationship, pulp forests provides a theoretical basis for the prediction and selection of the two species of early wood species.The results show that between the larch and Pinus sylvestris heartwood age and the age of the cambium growth, growth and the formation of layers of heartwood radius value changes have a significant positive correlation. Optimal regression model to compare two-factor a polynomial model is y=a×x2-+b×x+c. Larch sapwood age will not change with the formation of the the layer increasing age trend change. Pinus sylvestris in this regard showed a high positive correlation. Along the trunk direction heartwood content of growth, the width of the sapwood trunk ratio and bark thickness attributable to the change shows a higher correlation. The heartwood of the growth process is accompanied by the formation of the layer growth simultaneously, increased state is always in the process of growth of the core material, of the larch, Pinus sylvestris slowed with the growth trends of the age to enter the mature heartwood, the two species the age of the core material with the forming layer age changes are always consistent. Changes in the relationship between sapwood width value of the radius of the cambium and sapwood age with consistent changes in the performance of the same species, forming a layer of the relationship between age and the obvious differences between the different species. Sapwood area’s share of larch accounted for the proportion of the total area of the trunk at the base of the trunk is much smaller than the proportion of the vertical distribution of the trunk, pine, larch and Pinus sylvestris same trend in the early process of growth, but in two species into maturity evident Pinus sylvestris sapwood area ratio in the trunk at the top of a slight rebound. Bark thickness values change with the formation of the layer increase of the radius increases, the thickness of the bark change relationship with the radius value of the heartwood, and forming a layer of the radius variation pattern similar, but the performance of this similarity relationship Mongolica not significant. Under the same tree species in the same diameter class, due to the different growth conditions and competitive factors, can lead to very different tree growth ring width variations, reveals ring width value trends within individual trees of different ages. Larch and Pinus sylvestris individual tree wood density variations exist. At different heights in the trunk of a significant strain variability and radial variation. Larch trunks density in vertical gradually decreasing trend, Pinus sylvestris presented density trend is to reduce, and around the trunk height at20%and then began to increase.