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经过调查和试验，证明松树薪炭林的密度与产量关系密切。在一定范围内，不管林龄大小，不管采薪方式，其产量高低与密度大小成正比。
After investigation and test, it is proved that the density of pine tree firewood is closely related with the yield. In a certain range, regardless of the size of the forest, no matter the method of collecting salary, the output level is proportional to the density.