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作者经过三年的试验,取得了中龄马尾松人工林单位面积产脂量为87.5公斤,比天然林高82％;人均年产松脂可达2.4吨,比天然林高25％。证明了采脂对中龄马尾松人工林生长会产生不良影响,树径生长减少29.2％,材积生长减少14.7％,但总的经济效益比不采脂要大。所以用中龄马尾松人工林采脂是可行的。本文还提出了采脂对木材生产经济效益影响的计算公式,用该公式计算结果可以确定开始采脂的合理时间和恰当的采脂期限,以便以较少的木材生产损失换取较多的采脂经济效益。
After three years of experimentation, the author obtained a yield of 87.5 kg per unit area of Pinus massoniana plantation in middle age, which is 82% higher than that of natural forest. Per capita annual yield of rosin can reach 2.4 tons, which is 25% higher than that of natural forest. It was proved that the greasing of Pinus massoniana plantation had adverse effects on the growth of middle-aged Pinus massoniana plantation. The growth of tree diameter was reduced by 29.2% and the volume growth was reduced by 14.7%. However, the overall economic benefit was larger than that of no-fat production. Therefore, middle-aged Pinus massoniana plantation is feasible. This paper also proposed the formula of calculating the economic effect of collecting wood on the production of wood. Using the formula to calculate the result, it is possible to determine the reasonable time to start collecting the oil and the proper period of collecting the oil so as to exchange more fat for less wood production loss Economic benefits.