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前言杨树是察右中旗高寒地区农田林网、护牧林,城乡绿化和大片造林的主要用材树种之一。为培选适于该区生长的杨树良种,七五年于中旗苗圃定植了抗寒性较强的二十一个杨树种、变种和无性系。在杨树对比试验中,内蒙林科院和察右中旗苗圃共同协作,坚持科研密切结合生产。通过系统建立三圃一区,即引种圃、选择圃、良繁圃及定植对比试验区,起到了边生产边试验,试验示范和指导生产的作用。几年来,在各级领导的支持下,对比试验已
Preface Poplar is one of the main timber species for farmland, forest protection, urban and rural afforestation and large-scale afforestation in Chazhongzhongqi alpine region. In order to cultivate poplar varieties suitable for growing in this area, twenty-seven poplar species, varieties and clones with stronger cold resistance were planted in Zhongqi nursery in 1975. In the comparison experiment of poplar, Inner Mongolia Academy of Sciences and Chazhong Zhongqi nursery work together to adhere to the scientific research combined with production. Through the establishment of Sanpu District, that is, introduction of nurseries, selection of nurseries, nurturing gardens and contrasting experimental plots, it played a role in producing, testing, demonstrating and guiding production. Over the past few years, with the support of leaders at all levels, comparative tests have been made