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幼林平茬更新可以增强幼树长势,是改造低质“小老树”的好方法。具体做法可因树种不同而异。对山杏小“老树”和开花结实很少的老树要进行平茬更新,更新方法是用快镐齐地面伐去树干,将根茬埋土2寸厚,以防水分蒸发,便于萌发新苗。更新应在春季树液流动前进行。据辽宁省干旱地区造林研究所的调查证明,平茬更新后6年生的山杏林比不平茬更新的8年生的山杏生长量提高78％,地径生长量提高44％。
Young plantation stubble renewal can enhance the growth of young trees, is a good way to transform low quality “little old tree.” The specific practices may vary from tree species. Apricot small “old tree” and flowering sturdy little old trees to carry out stubble update, update method is to use quick pick to cut the trunk to the ground, the root stubble buried 2 inches thick, in order to prevent moisture evaporation, easy to germinate New seedlings. The update should take place before the spring sap flow. According to a survey conducted by the Afforestation Research Institute of Arid Land in Liaoning Province, the arborvitae six years after the recuperation was improved by 78% and the diameter growth by 44% compared with the eight-year-old arundinacea rejuvenated without stubble.