施肥对提高单位面积生长量,缩短轮伐期,增强林木对烟害、冻害和病虫害的抗性,减少木材比重及增加硫酸盐纸浆率等都有重要意义。目前多数国家主要是对幼林进行施肥,杨树是主要施肥树种之一。在我国,林木施肥尚处于初期试验阶段,特别是对于杨树施肥,目前只有少数单位 Fertilization is of great significance to increase the amount of growth per unit area, shorten the rotation period, enhance the tree’s resistance to tobacco smoke, frost damage and pests and diseases, reduce the proportion of wood and increase the rate of kraft pulp. At present, most countries mainly fertilize young forests. Poplar is one of the main fertilization species. In our country, forest fertilizer is still in the initial experimental stage, especially for poplar fertilization, there are only a few units