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随着造林和荒漠治理工作的发展,对造林树种的抗性和功能效益的要求越来越高.选用的树种优质、速生且抗性强,短期内能发挥其应有的作用,是最为理想的.一个树种,在不同的特定环境里,长期生长繁衍,往往会发生某些变异,在生产实践中,把符合要求的个体(或类型)变异,从混杂的群体中挑选出来的过程,称之为人工选择.因为这种选择,通常是根据林木的在生长发育过程中,可以观察到的性状进行的,所以又叫表型选择.选择不仅可以单独创育良种.同时也是其它林木良种选育方法中不可缺少的环节.所以选择不仅能起
With the development of afforestation and desertification management, the requirements for the resistance and functional benefits of afforestation species are higher and higher, and the selected tree species are of high quality, fast-growing and resistant and can play their due role in the short term, which is the most ideal . A tree species, in different specific environments, long-term growth and reproduction, there will always be some variation in the production practice, to meet the requirements of the individual (or type) mutation, from a mixed group of selected process, said Because this choice, usually based on the growth and development of trees in the process, you can observe the traits, it is also called phenotypic selection .Optional not only can be a separate seed breeding .At the same time is also the other forest seed selection Education methods indispensable link, so the choice can not only play