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我圃从一九六六年以来,先后在北京顺义引河林场、包头青山苗圃、宁夏、河北,巴盟林研所、昭盟林研所等地引进品种杨205个品种和品系。我们建立了品种杨引种区和苗期对比区,定期观测对比。七一年又建成了七亩大树对比试验区,从205个杨树品种品系中,初步选出了45个较好的品种继续试验,使杨树良选种研工作有了很大的进展。七五年以来,我们前后分不同立地条件扩建了杨树大树定植对比试验区80多亩,结合选纯选优更新了苗期对比试验区,加强了科研小组的力量,按时记载定期检查,每个作业队都建立了良种繁
Since 1966, we have introduced 205 varieties and lines of variety Yang in the well-guided river farm in Shunyi, Baotou Qingshan Nursery, Ningxia, Hebei, BaMingLin Research Institute and Zhaomei Forestry Research Institute. We have established varieties of Yang introduction and seedling contrast area, regular observation and comparison. Seventeen years has completed the construction of seven acres of large trees in the pilot area, from 205 poplar varieties, the initial selection of 45 better varieties to continue the test, poplar species selection and research work has made great progress. Since the last five or five years, we have expanded the area of more than 80 mu of poplar large tree planting contrast test area before and after different points. We have updated the experimental area of seedling comparison with the selection of pure selection, strengthened the strength of scientific research groups, regularly inspected on time, Each work team has established a good variety