【摘要】 <正>107杨(Populus×euramericana’Neva’)是欧洲黑杨和美洲黑杨的杂交品种,由中国林业科学研究院张绮纹等科技人员经过10多年引育成功的欧美杨优良品种,具有生长快,易管理,耐旱,耐寒及抗病虫等特性,是造纸的优质原料,还可制作密度板、家具、火柴、筷子等,用途十分广泛(高俊华,2008)。107杨已在我国黄淮以北、辽河以南广泛种植,区域包括山东、安徽、河北、辽宁等省(席忠诚等,2008),已成为营造工业原料林和防护林的首选杨树品种之一。更多还原

【Abstract】 Based on investigation of 6 year old plantations of Populus × euramericana ‘Neva’in Hengshui,the relationship between stand density and growth was studied.The results showed that there was negative relationship between stand density and stand mean diameter,mean tree height,mean crown width and mean individual volume.The average tree’s diameter,height,crown width and volume for individual trees decreased with the increase of stand density in a certain range.The ratio of height to diameter of trees increased with high density.Stand volume first increased with the stand density in low density range,however decreased with the increase of stand density in higher density range.The optimum plantation density for stand growth was 1 000-1 200 stem·hm-2 in Taocheng District and 800-1 000 stem·hm-2 in Wuyi County.更多还原