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为确保苗木安全越冬,免受冻害和生理干旱引起的死亡,对一些针叶树和抗寒力弱的阔叶树幼苗,必须在严寒季节来临前,进行越冬防寒。主要采取如下几种方
In order to ensure the safety of seedlings overwintering from frost damage and death caused by physiological drought, some conifers and hardy hardwood seedlings must be overwintered and cold-protected before the cold season comes. Mainly take the following types of parties