滨海沙地木麻黄基干林带不同更新方式综合评价研究

A Study on Comprehensive Evaluation of Different RegenerationMethods for Trunk Shelterbelts of Casuarinaequisetifolia on Coastal Sandy Soil

运用密切值法,于2002年对滨海沙地木麻黄基干林带5种更新方式进行综合评价,结果表明,间隔带状采伐更新方式优于林下套种更新方式,间隔带状采伐更新其生态、社会、经济及综合效益均高于林下套种更新方式。在间隔带状采伐更新中,以窄采伐带为优。林下套种更新方式中,林带渐伐后林下更新方式其生态、社会、经济及综合效益均比直接在林下套种更新方式高。对于只能进行林下套种更新的木麻黄基干林带,根据林带郁闭度作适当渐伐调整并选用适应于沿海沙地生长具有一定耐荫性的树种在林下套种,可使其综合效益得到明显提高。

Five different regeneration methods for trunk shelterbelts of Casuarina eqiusetifolia on coastal sand were analyzed by osculating value method. The results showed that the methods of regeneration by strip-felling were significantly superior to the methods of regerneration by interplanting, the ecological, social, economic and comprehensive benefits of the methods of regeneration by strip-fell were higher than that by interplanting.In the methods of regeneration by strip-felling, the narrow cutting belt was superior to the wide one. The ecological, social, economic and comprehensive benefits of which under forest after pregeneration were superior to the direct one. As to the trunk shelterbelts of Casuarinas eqiusetifolia which are only regenerated by interplanting, their comprehensive benefits can be improved obviously through pregeneration based on their canopy density and selecting shaded tree species to interplant.