选择和选择方法3．多性状选择（multiple traits selection）大多数的树种改良计划都要求同时改良几个性状。选择性状的多少，影响选择效果。
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... 单性状选择 single character selection 多性状选择 multiple character selection 直接选择 direct selection ...
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优劣解距离法，是多性状选择的一种新方法．适合畜禽多任状的比较分析并作出选择。
The method of distance of good-gad solutions was a new and simple method, which could be analySed adn compared on a several characteristic in animal and poultry.
综合选择指数是开展生长、树形和材质多性状优良家系联合选择的理想方法。
Synthetic selection index is a good measure for union selection on growth traits, tree form traits and wood properties.
建议多性状长期选择时应用实际指数法或约束指数法。
The suggestion is that emperical index or restricted index should be used for long-term selection for multi-traits.
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