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马尾松天然群体由于自然选择和进化结果使群体间存在表型上的差异，应用数量化理论Ⅰ及相对育种值将马尾松天然林分分成三个等级，为林分选择利用提供数量依据。
Due to the phenotypic differences between natural populations and Masson Pine populations, the natural masson pine forests were divided into three grades using quantitative theory Ⅰ and relative breeding values, which provided the quantitative basis for the selection and utilization of the stands.