采脂处理对湿地松幼龄林生长和材性的影响

为了解采脂对湿地松生长和材性的影响，以广西华山林场湿地松幼龄林为对象，进行了不同时间长度的采脂试验。设置不同起始采脂年龄，通过不同采脂处理的湿地松，分析了其生长和材性的变化情况。结果表明：采脂对湿地松胸径和年轮宽有一定负面影响，但影响程度不大。采脂强度40%左右时，立木的自身生长势对胸径和年轮宽的影响远远大于采脂对胸径和年轮宽的影响。采脂对树高和晚材率没有显著影响。采脂会降低湿地松的密度，采脂时间越长对密度的影响越大，离树皮越近受采脂影响也越大。采脂降低了顺纹抗压、抗弯强度和冲击韧性等几个力学性能指标。虽然是幼龄林的早期采脂，但是采脂强度适中的前提下采脂对其生长影响不大。湿地松幼龄林采脂导致了密度和力学性能等材性指标不同程度的降低。

Influence of resin tapping treatment on the growth and physical properties of slash pine young forests

In order to understand the influence of resin tapping on the growth and wood properties of slash pine, experiments of different durations of resin tapping were conducted for the slash pine young forests. The results showed that resin tapping affected the diameter at breast height ( DBH) and ring width, however the influence was insignificant. When the resin tapping intensity was about 40%, the influence of tree growth vigor on the DBH and ring width was more significant than that of the resin tapping. Resin tapping had no notable impact on the tree height and latewood ratio. Resin tapping reduced the wood density of slash pine. The longer the tapping time and closer to the bark the greater impact to the wood density. The resin tapping reduced the mechanical properties of compressive strength parallel to the grain, bending strength and impact toughness. Even though young trees were in early resin tapping treatments, the resin tapping had insignificant influence on the growth under moderate intensity. However the resin tapping resulted in the decreasing of physical properties of slash pine.