湿地松子代测定中合适家系大小及小区大小的探讨

The Study of Suitable Family Sizes and Plot Sizes in Progeny Testing of Pinus elliottii

Two progeny testing plantations which contained the same open-pollinated progenies of slash pine (Pinus elliottii) were established. These two plantations were of randomized and complete block design, 48 offspring per family and 4-tree plot. Height and diameter at breast height were measured in the 5-year-old progeny test stands, and these data were used to analyze the relationship between families (or parents) ranking or family heritability and family sizes or plot sizes. The results show that the required minimum family size is 30 for obtaining reliable rank per family and family h2 in one single site test. But in two site tests, the minimum family sizes are different for family ranking and family h2, they are 10 and 30 respectively. Different sites and family sizes have different optimum plot sizes, in general, two- or three-tree plot is more efficient than single- or four-tree plot for estimating family ranking and family h2.