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植被演替规律是封山育林的理论基础。依据更新与立地条件相关关系,通过数量化理论(Ⅰ)分析,确定出坡向、土层厚、坡位、母岩和海拔为影响更新主导因子。按立地与更新树种双因子法划分出7种封育类型;根据冠幅与年龄线性关系,测算出各类型最佳封育期;通过定位观察对比试验,研究出各类型人工促进成林技术。研究认为,封山育林具有投资少、见效快、效益高、符合国情等特点,且林分稳定,克服大面积人工纯林在经营上存在的各种难以解决的矛盾。其生态效益显著,是改善本区生态环境的一项根本性措施。
The law of vegetation succession is the theoretical basis of closing hillsides for afforestation. According to the relationship between the renewal and the site conditions, through the quantitative theory (Ⅰ) analysis, it is determined that the dominance factor is updated due to the slope, thick soil layer, slope position, parent rock and altitude. According to the linear relationship between crown length and age, the best sealing period of each type was calculated. Through the comparative observation and experiment, various types of artificial forest-growing techniques were studied. According to the research, the afforestation has the characteristics of less investment, quick response, high benefit, in line with national conditions and other characteristics, and the stability of the stand, to overcome a large area of artificial pure forest management there are all kinds of difficult to solve contradictions. Its remarkable ecological benefits are a fundamental measure to improve the ecological environment in this area.