Analysis on the Variation of Female-male Flowers and Strobilus Production of Clonal Seed Orchard of Pinus tabulaeformis Carr

The strobilus production of female flowers,male flowers and 2-year-old cone of 222 plants from 37 clones of Pinus tabulaeformis Carr. in Luonan Gucheng seed orchard was investigated and the genetic variation law was analyzed based on above the data.The result indicated that the difference was remarkable within the clones on strobilus production of female and male flowers,2-year-old cone,tress height and tress crown size.The some difference existed within the plans among the clones on strobilus production of female and male flowers and cone production.The more the strobilus production of female flowers was,the smaller their difference was.The difference in the north and south branch on one clone on strobilus production of female flowers and the 2-year-old cone was extremely significant,but that on strobilus production of male flowers was not remarkable.The phenomenon of female or male toward also occurred in the some plants of clones.According to 5 quantity characters of the strobilus production of female flowers,2-year-old cone production,tree high,tree diameter at chest height,crown size,6 good clones of No.285,No.273,No.291,No.10,No.266,No.289 were selected by integrated scoring method of breeding value based on ranking(CICR).