油松建筑材林最适主伐龄研究
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通过对比其他针叶建筑材树种材性指标，认定油松作为建筑材林培育切实可行。根据基本调查数据及当地造林资料，测定油松建筑材林材性指标，并结合建筑材材种规格得出的不同径级木材出材量和出材率，考虑两者得到工艺成熟龄；测定经济指标，当投资收益最大化对应的年龄为经济成熟龄；测定材积生长量指标，连年生长量和平均生长量曲线相交对应的年龄为数量成熟龄，综合三者得出最适主伐年龄。结果表明，培育油松建筑材林初植密度宜小，控制在2 500株/hm2以下，在主伐前可配合修枝措施、合理间伐以促进油松建筑材林的高效培育。培育中径级油松建筑材林的工艺成熟龄为47 a，培育大径级油松建筑材林的工艺成熟龄为50 a，可适当延迟3～5 a，以获得较高品质的大径级建筑材；经济成熟龄为47 a，数量成熟龄为35 a。
By comparing the wood property indicators of other coniferous construction tree species, it is confirmed that cultivating Chinese pine (Pinus tabuliformis) as a construction timber forest is practically feasible. Based on basic survey data and local afforestation materials, the wood property indicators of the Chinese pine construction timber forest were measured. Combined with the specifications of construction timber products, the timber volume and yield rate of different diameter classes were derived, and the technical maturity age was determined by integrating these two datasets. Economic indicators were measured, and the economic maturity age was defined as the age corresponding to the maximum return on investment. Volume growth indicators were measured, where the age at the intersection of the current annual increment (CAI) and mean annual increment (MAI) curves was taken as the quantitative maturity age. The optimal final cutting age was obtained by comprehensively considering the three maturity ages mentioned above. The results show that the initial planting density for cultivating Chinese pine construction timber forests should be relatively low, controlled below 2500 trees per hectare. Before final cutting, pruning measures and reasonable thinning can be adopted to promote the efficient cultivation of Chinese pine construction timber forests. The technical maturity age for cultivating medium-diameter class Chinese pine construction timber forests is 47 years, while that for large-diameter class ones is 50 years, which can be appropriately delayed by 3 to 5 years to obtain high-quality large-diameter construction timber; the economic maturity age is 47 years, and the quantitative maturity age is 35 years.
