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通过野外调查和对以往资料的分析研究认为 ,贺兰山天然次生林更新状况青海云杉 >油松 >山杨 ,影响贺兰山天然次生林天然更新的主导因子是人为作用。封山育林是贺兰山最有效的促进天然更新的措施。特别指出应妥善解决好封山育林所带来的林牧矛盾 ,加大封山育林的力度
Through field investigation and analysis of past data, it is considered that the regeneration status of natural secondary forests in Helan Mountain is mainly due to the dominant factor affecting the natural regeneration of natural secondary forests in Helan Mountain. Hill closure Yulan Mountain is the most effective measures to promote natural regeneration. In particular, they pointed out that the contradictions between forestry and livestock brought by closing hillsides to facilitate afforestation should be properly resolved and the efforts should be intensified