【摘要】 通过对闽北2个不同世代杉木种子园无性系球花产量的分析,结果表明,(1)杉木2代、1代种子园建园无性系雌、雄球花产量在树冠内的水平分布均表现为由内至外依次递增的规律,不同方位的差异较小。(2)球花在树冠上的垂直分布具有较为明显的成层性,雌、雄球花分别主要着生在树冠的中上部及中下部,但球花成层性在无性系间差异明显,且雄球花较雌球花的成层性更为稳定。(3)无性系间雌、雄球花产量差异巨大,少数无性系球花产量的垄断现象明显,不同世代种子园无性系球花产量无显著差异。(4)2个不同世代种子园均存在严重偏雄的现象,无性系间雄、雌球花性别比差异较大,雌球花过少的无性系所占的比重太大,不利于种子园的丰产。(5)种子园雌、雄球花产量可作为种子园健康状况的良好诊断指标。(6)杉木无性系开花习性具有较生长性状更高的变异系数,为无性系的再选择提供了事实依据。更多还原

【Abstract】 Through the analysis of flowers yields in two generation seed orchards of Cunninghamia lanceolata located at the north of Fujian Province,six main conclusions were gotten.The level distributions of flower yields in the crown of two seed orchards both showed that flower yields increased from inner to outer,the effects of orientation were weak.The vertical distribution of flower yields had obvious stratification quality,female flowers and male flowers respectively mainly grew at the upside and downside,the stratification quality was obviously different among clones,and male flowers had more stable vertical distribution characteristics than female flowers.The high generation improvement,based on timber growth,did not simultaneously optimize the distributions of female flowers in the crowns.The difference of flower yields was big among different clones,few clones had the multitude flower yields.The flower yields of clones had not obvious difference between two generation seed orchards.Two improved seed orchards both presented serious male deflection phenomenon,the ratios of male flower yields to female flower yields had great defference mong different clones.The proportion of clones that had too small female flowers was too big.The female and male flower yields of seed orchards could become a good index to diagnose health status of seed orchards.The abloom behaviour of Chinese fir clones had the higher variance coefficient than growth characteristics,which provided the practical basis for the reelection of clones.更多还原