目前,我国已有大部分地区营造杨树速生丰产林,并已成为发展的趋势。但就如何营造丰产林的技术问题,还有很多方面尚在进一步研究和探讨之中。包括杨树在内的许多树种的造林密度问题,一直是林学家们十 At present, most areas of our country have established poplar fast-growing and high-yield forests and have become a trend of development. However, there are still many aspects that are still under study and discussion on how to create a high-yielding forest. The density of many tree species, including poplar, has always been a problem for foresters