为探讨加杨和北京杨在北京地区速生丰产的途径,我们于1959-1980年在院址附近进行了加杨、北京杨集约栽培试验。现将试验方法与结果简介如下。一、试验地自然概况试验地位于北京西郊玉泉山东侧。地势平坦,壤质褐色土、土层厚2米以上,pH值8.0,腐殖质含量约1.39％,速效磷含量10-25毫克/ In order to discuss the ways of high-yielding poplar and poplar in Beijing, we conducted intensive cultivation experiments of poplar and poplar in Beijing near 1959-1980. Now the test methods and results are as follows. First, the experimental nature of the test site is located in the western suburbs of Beijing Yuquan Shandong. Flat terrain, loamy brown soil, soil thickness 2 meters above, pH 8.0, humus content of about 1.39%, available phosphorus content of 10-25 mg /