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一、林木分级的重要性 落叶松人工林的群体在生长发育过程中,不断进行分化和稀疏,自然的调正和扩大其营养空间,促进林分发展,至到终结。例如大兴安岭落叶松原始林(杜鹃林型),开始每垧地平均11375株,经过二百年的分化和稀疏,最后仅剩下平均532株,其余均随时间的进展而被淘汰;我院帽儿山实验林场1958年栽的15年落叶松人工林每垧地8000株,经过15年的分化和稀疏被淘汰占16％。正个过程就是林木之间为争夺营养空间的竞争。
First, the importance of forest grading Larch plantation population in the process of growth and development, continuous differentiation and sparse, natural adjustment and expansion of its nutritional space, and promote the development of the forest, to the end. For example, the original forest of Larix gmelinii in Daxing’an Mountains (rhododendron forest type) started an average of 11375 plants per hill. After two hundred years of differentiation and sparseness, only an average of 532 plants remained. The rest were eliminated with the progress of time. Er Shan experimental forest farm In 1958 planted 15 years of larch plantation 8000 per plant, after 15 years of differentiation and sparse were eliminated accounted for 16%. The process is the competition between trees for nutrition space competition.