【摘要】 在总结“三北”防护林体系工程建设２０年和长江上游防护林工程建设１０年建设成果的基础上，指出了封山育林在江河源头防护林体系建设中的特殊地位，并提出了在扩大江河源头森林植被中实施封山育林的具体措施。更多还原

【Abstract】 Analyzing the achievements of the 20years’ constuction of the "Three North" Protection Forest Project and the 10 years’ construction of te Yangtse River Upriver Protection Forest Project, we conclude that“Closing Hillsides for Afforestation” is very important in the construction of the Protection Forest System in the heandstrearn area of the Yangtze and Yellow River.更多还原