湿地松生长、产脂量和松脂成分变化的林分密度效应研究

对高密度湿地松用材林进行抚育间伐，研究用材林改造为用材/采脂兼用林的密度调控机理。结果表明： （1）通过抚育间伐降低林分密度，林分胸径生长量增加，进而会提高林分中径材和大径材比例；（2）间伐后林分保留木树 脂道面积显著增大，松脂流量增加，林分产脂量也有显著提高；（3）林分密度变化会改变松脂组分比例，林分密度小，单 萜组分含量增加，二萜和挥发性组分降低，有利于改善松脂质量；（4）对适宜立地湿地松用材林进行密度调控，是将早期以用材为目标的人工林改造为材脂兼用林的有效措施之一

We conducted thinning trials on high-density Pinus elliottii timber stands to investigate the density regulation mechanism for transforming pure timber plantations into multi-purpose forests for both timber production and resin tapping. The key findings are as follows: (1) Reducing stand density through thinning increases the diameter at breast height (DBH) growth of the stands, thereby increasing the proportion of medium- and large-diameter timber in the forest; (2) Following thinning, the resin duct area of retained trees in the stand increases significantly, accompanied by elevated pine resin flow and a substantial improvement in stand resin yield; (3) Variations in stand density alter the composition ratio of pine resin components: lower stand density results in increased monoterpene content and reduced diterpene and volatile component levels, which contributes to improving pine resin quality; (4) Conducting density regulation on Pinus elliottii timber stands growing on suitable site conditions is one of the effective approaches to convert early-stage timber-focused plantations into multi-purpose forests for both timber and resin production.