摘要
为提高长江护岸林的生长量, 减少虫害, 进行了杨树多系混合造林研究。结果表明: 沿江护岸林欧美杨多系混合造林较单系造林生长量和年利润率均提高15 % 以上, 天牛虫株率控制在3 % 以内; 选育出4 个优良无性系, 材积生长量较169 杨( 对照) 提高18-4 % ~47-5 % 。对参试欧美杨无性系进行了生长阶段和生长等级的划分。表7
For increasing sampling and decreasing poplar borer harming of protective belt along the Changjiang River,Multi clone admixture planting of poplar was studied in Anhui Province.The results showed that compared with one clone planting,sampling and profit rate of multi clone admixture planting of poplar were increased over 15%,and trees harmed by stem borers were controled less 3%.Four fine colones which sampling were over 18 4%~47 5% compared with Ⅰ 69 were selected(cv.Zhonglin 490,cv.Zhonglin 487,cv.Zhonglin 715,and cv.Zhonglin 789).Growth steges and grades of tested poplars were divided.
出处
《浙江林学院学报》
CSCD
1999年第4期346-352,共7页
Journal of Zhejiang Forestry College
关键词
河岸防护林
欧美杨无性系
多系混合造林
防治
river bank protection forests
Carolina poplar colones
multi clone admixture planting
productivity
stem borers
integrated control