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对于没有通过良种引种程序即在洞庭湖区大面积育苗、造林的各种杨树无性系,选择了5个南方型黑杨、5个北方型黑杨、3个三倍体毛白杨以及湖南省林科院等培育的2个湘林美洲黑杨新无性系,在岳阳君山垸内进行无性系对比试验。根据5年生的生长量分析,初步显示湘林-90、湘林-77两个新无性系最具生长优势,可在湖区推广应用;南林-1388、南林-895、南林-35l、鲁山杨(辽宁杨)、南林-95杨5个黑杨派南方型无性系可作一般性生产用种在湖区应用;黑杨派5个北方型无性系108杨、107杨、常绿杨A、山哈杨、华林杨等,白杨派3个三倍体毛白杨无性系,其5年生的材积仅为南林-95杨的53.0-12.7%,为湘林-90杨的4O.4-9.6%,不宜在湖区推广应用。
For the various poplar clones that did not introduce seeds through seed introduction in large area in Dongting Lake, five southern poplar, five northern poplar, three triploid Populus tomentosa and Hunan Branch Courtyard and other nurturing two new clones of Xianglin American clones, in Yueyang Junshan embankment comparative test. Based on the 5-year growth analysis, the results showed that the two new clones, Xianglin -90 and Xianglin-77, had the most growth advantages and could be popularized and applied in the lake area. Nanlin -1388, Nanlin-895, Nanlin- Populus euphratica (Liaoning Yang), Nanling -95 Yang 5 Populus to send the South clones can be used for general production of the species used in the Lake; Black Poplar sent five northern clones 108 Yang, 107 Yang, evergreen Yang A, Shanhayang, Hualin Yang, Poplar sent three triploid C. sojae clones, and its 5-year-old volume is only 53.0-12.7% of Nanlin -95 Yang, 90-Xiang-90 Yang 4O. 4-9.6%, should not be popularized and applied in the lake area.