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从1983年起,我们进行了河北杨的遗传资源调查,在此基础上选择了优树。为了保存优树资源,为河北杨的遗传改良提供物质基础,进行了嫩枝扦插繁殖试验,现简报如下。一、试验地概况试验地设在陕西省杨陵区西北林学院校园内,年平均气温12.9℃,≥10℃积温4184℃,年平均降水量635.1mm,集中于7、8、9三个月。土壤为(?)土,pH 值7.8—8.4。二、材料和方法材料用河北杨平茬苗和埋根苗的萌条嫩枝。当枝条生长至10—15厘米长时,用锋利刀片从萌条基部切下嫩枝。插穗长为
Since 1983, we conducted a survey of genetic resources of Hebei Yang, on the basis of which we chose the best tree. In order to preserve the resources of superior trees, provide the material basis for the genetic improvement of Hebei poplar and carry out the tender shoot propagation experiments. I. Overview of the experimental site Located in the campus of Northwest Forestry College in Yangling District of Shaanxi Province, the average annual temperature is 12.9 ℃, the accumulated temperature is 4184 ℃ ≥10 ℃, and the annual average rainfall is 635.1mm, which is concentrated in 7,8,9 months. The soil is (?) Soil, pH 7.8-8.4. Second, materials and methods Materials Hebei Yang Ping stubble seedlings and buried root sprouts shoots. When the branches grow to 10-15 cm long, with a sharp blade cut from the base of the sprouts shoots. Cuttings for the length of