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一、引言根据我国林业发展的新形势,今后要大力营造速生丰产林,尽快提高林业生产的经济效益和生态效益。营造杨树速生丰产林提倡4×4、5×5、6×6m的大株行距,加之人为创优的条件,已取得速生丰产的效果。能否有更先进的办法,在同等条件下取得最佳丰产效果,这是林业工作需要探讨的问题。通过调查黑山地区护路林、林网、大面积用材林,杨树都表现出具有边行优势的特点,
I. INTRODUCTION According to the new situation of forestry development in China, it is necessary to vigorously create fast-growing and high-yield forests in the future so as to increase the economic and ecological benefits of forestry production as soon as possible. Poplar plantation to promote fast-growing 4 × 4,5 × 5,6 × 6m advocate large line spacing, combined with man-made excellence conditions, has made fast-growing effect. Whether there is a more advanced way to achieve the best yield under the same conditions is the issue to be discussed in forestry work. Through the investigation of the Black Forest Road, Lin, Lin, a large area of timber, poplar have demonstrated the edge of the advantages of the characteristics,