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通过对黑龙江省几十年来杨树引种工作的总结与分析 ,将引种的品种分为发育正常、能成活生长、不能正常生长三种类型 ,经过选择确定适合于平原和山区造林的品种
Through the summarization and analysis of introduction of poplar in Heilongjiang province in recent decades, the introduced varieties are divided into three types: normal growth, survival growth and normal growth, and the varieties suitable for afforestation in plain and mountain are selected