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栽植在多种立地条件下的树种,其基因型的相对表现依赖于随立地位置而异的各种环境因素的变化而变化。在这种情况下,育种值的测定必须基于多立地的,而不能仅用一些“平均”立地。事实上,定义上“平均”是假设宜林地频率分布是存在的,在平均立地上栽植是假设分布平均数是能够估算的。所以,为使基因型、育种群体或种源的育种值达到最大,就得评定它们在立地区域内各立地上的综合表现。
The relative performance of the genotypes of the tree species planted under a variety of site conditions will vary depending on the variety of environmental factors that vary with location. In this case, breeding values must be based on multiple sites and not just some “average” site. In fact, the definition of “average” is the assumption that the frequency distribution of forest land is present, and planting on the average site is a hypothetical distribution average can be estimated. Therefore, in order to maximize the breeding value of genotypes, breeding populations or provenances, it is necessary to assess their overall performance on each site within the site.