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优树(又称正号树)的选择,配合种子园的建立,是当前国内外实现林木良种化最主要的途径。优树选择,是根据选种目的,按表现型一株一株地选出,一株一株地评比。所以,它比混合选择更加精确、可靠。优树选择,始于本世纪30年代。当时只有丹麦、瑞典的少数人做这项工作。目前世界上已有30来个国家作了选优和建园工作。我国广大林业职工,遵循毛主席“自力更生”的教导,于60年代初期试行这项工作。近年来,全国各省区普遍加快了选优工作进程,有的省区
Excellent tree (also known as the positive tree) choice, with the establishment of the seed orchard, is the current domestic and international forest tree planting the most important way. Tree selection, is based on the purpose of selection, according to the phenotype of a plant to elect, a strain rating. So, it is more accurate and reliable than the hybrid choice. Tree selection, began in the 1930s. At that time only Denmark, Sweden, a few people do this work. At present, 30 countries in the world have made excellent work and built parks. The vast majority of forestry workers in our country, following Chairman Mao’s “self-reliance,” tried out this work in the early 1960s. In recent years, various provinces and autonomous regions in our country have generally accelerated the process of selecting and selecting excellent ones, and some provinces and autonomous regions have also done so