【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169 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 参4更多还原

【Abstract】 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.更多还原