日本落叶松幼一成龄相关选择模型及早期选择策略

利用日本落叶松半同胞子代测定林的材料，以线性函数式、对数函数式及二次抛物线函数式拟合遗传力平方根比率和幼一成龄遗传相关系数随相对年龄变化的趋势，以年遗传增益作为评价指标，构建最大年遗传增益模型。根据轮伐年龄及估算的最佳早期选择年龄和早期选择效率，确定了日本落叶松逐步选择的早期选择策略。对于轮伐龄材积的选择，以树高作为早期选择指标较为适宜，若轮伐龄为２０ａ，可采取一次选择，分别在２年生及７～８年生时进行；若轮伐龄定为４０ａ，则采取３次选择，分别在３、１２和１５～１６年生时进行。

JUVENILE-MATURE CORRELATED SELECTION MODELAND EARLY SELECTION STRATEGIES FORJAPANESE LARCH (LARIX AAEMPFERI)

Data of Japanese larch stands for half-sib progeny test were used in thispaper.The change trends of ratio of square root of heritability and juvenile-mature correlation with relative ages were approximated with linear function,logarithmic function and quadratic function. Annual genetic gain was used asevaluation criteria for establishing maximum genetic gain models.According torotation ages, estimated optimum early selection ages and early selection emciency,early selection strategies for selecting gradually were determimed forJapanese larch.To predict the volume at rotation age, tree height at early stagewas an approriate trait for early selection.Selections should be made at age 2and 7-8 for rotation age 20, and 3, 12 and 15-16 respectively for rotation age 40.