【摘要】 在内蒙古大青山山前冲积平原区构建农田防护林体系,根据立地条件类型选择新疆杨、北京杨、合作杨、群众杨、白柳、旱柳、垂柳等适应性强、生长快的优良品种,采用了适当的抗旱造林技术措施。经测定得出:造林成活率为95%-99%、保存率为95%以上;从2000—2003年营造的农田防护林带均已进入速生期,林带的平均高为9.1 m,平均林带树冠高7.6 m,平均冠幅2.6 m×2.5 m;同时防护林带均发挥出了明显的防风、降温及增加湿度的生态功能。更多还原

【Abstract】 The shelter forest system was constructed in alluvial plains in front of the Daqing in Inner Mongolia.According to site type,the adapting and fast-growing variety of Populus.Alba.L.var.pyramidalis Bge,P.×beijingensis W.Y Hsu,P.×xiaozhuanica.cv.Opera,P.×xiaozhuanica.cv.Popularis,Salix.alba,S.matsudana,S.babylonica were planted by measuring of against drought.The results showed that survival rate of trees planted are between 95.0% and 99.0%.The survival rate reaches 95.0%.The farmland shelter that was planted from 2000 to 2003 has entered the fast-growing time.The average high was 9.1m,average crown high was 7.6 m,average crown was 2.6 m×2.5 m.Meanwhile,the forest belt has had obviously ecological function on protecting against the wind,decreasing temperature and increasing the humidity.更多还原