杨树是山东省主要造林树种之一 ,也是适宜的薪炭林树种 ,确定最佳采柴周期、造林密度、混交方式 ,是提高生物量的关键技术。经多年定位观测试验得出 :杨树乔林作业的薪炭林最佳造林密度为 2m× 2m ,最佳采伐周期为 5a ;矮林作业的杨树 ,最佳采伐周期为 3a ,其单位面积年生物量最高 ,并能节省成本 ,提高生态和社会效益 Poplar is one of the main afforestation species in Shandong Province, and is also an appropriate fuelwood tree species. Determine the best harvesting cycle, afforestation density, mixed mode, which is the key technology to improve biomass. After many years of location observation and experiment, the optimal afforestation density of poplar trees in operation of Poplar Qiao Lin is 2m × 2m and the best harvesting period is 5 years. The optimal harvesting time of poplars is 3 years and the annual biomass per unit area Highest, and can save costs, improve ecological and social benefits