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超级苗木选择是一种混合选择、混合繁殖的选种方法。所谓超级苗木是指在苗圃中土壤条件和经营管理措施都近于一致情况下,生长特别突出的苗木,可以认为这是优良遗传特性表现的结果。用经过选择的新疆杨的超级苗木建立良种采穗圃,提供优良插穗繁殖苗木,再用来造林,是使树木生长快,材质好,成材早的重要措施。其选择方法简介如下: 一、选择样地及样地苗木的生长调查 样地即标准地。在新疆杨苗圃地内选择具有代表性的成活率在60％以上,而且分布较均匀的地点作为样地,(地块两边的各1—2畦不宜选为样地)。其面积为总面积的2—3％。
Super seedling selection is a hybrid choice, mixed breeding selection method. The so-called super-seedlings refers to nursery soil conditions and management practices are close to the case of special growth of seedlings can be considered as a result of good performance of genetic characteristics. It is an important measure to make the trees grow fast, the materials are good, and the timber is made early with the selected super seedlings of Xinjiang poplar to establish the seed breeder nursery garden, provide excellent cutting propagation seedlings and reforestation. The selection method is as follows: First, choose the plots and plots of seedlings growth survey plots that is standard. Select a representative survival rate of more than 60% in Yang nursery in Xinjiang, and the more evenly distributed sites as plots, (1-2 plots on both sides of the plots should not be selected as plots). Its area is 2-3% of the total area.