闽北山地不同世代杉木种子园球花产量调查

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。

Investigation of flowers yields in different improvement generation seed orchards of Cunninghamia lanceolata located at the north of Fujian

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 st...