林木的生长和发育,需要多种营养元素。这些元素多以离子状态被树木根系和叶面吸收,并通过输导组织输送到树体各部位,参与生长和代谢过程的各种生理生化活动,促进林木的正常生长发育。因此,增施肥料对林木速生增产至关重要,也是农田防护林必需的抚育管理措施。 Forest growth and development, need a variety of nutrients. Most of these elements are ionized by the tree roots and foliar absorption, and through the delivery of tissues to various parts of the tree to participate in the growth and metabolism of a variety of physiological and biochemical activities, and promote the normal growth and development of trees. Therefore, the application of fertilizers is crucial to the fast growing forest and it is also the necessary tending management for farmland shelterbelt.