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杨树“小老树”形成的原因是多方面的,由于立地条件、气候特点、自然灾害、以及人为活动等因素,使树木不能按其生物学特性正常生长,及时郁闭成林、成材,面形成形态各异的“小老树”。给木材生产、防护效益和生态平衡等带来损失。一、立地条件与“小老树”赤峰城郊林场,以人工小叶杨、小青杨为主的杨树“小老树”的形成,在该地气候条件下与立地条件有着密切的关系。现根据地形地势、沙丘类型、土壤PH值、碳氮
Poplar “little old tree” formed for many reasons, due to site conditions, climate characteristics, natural disasters, and human activities and other factors, so that trees can not grow normally according to their biological characteristics, timely closed forest, timber, The formation of different shapes of “little tree.” Which will bring losses to timber production, protection benefits and ecological balance. First, the site conditions and the “small tree” Chifeng suburbs farm, artificial poplar, young poplar mainly poplar “little tree” formation, in the climatic conditions and site conditions are closely related. According to topography, sand dunes, soil PH value, carbon and nitrogen