黄樟种源、家系早期生长性状变异与初步选择

Growth traits variation analysis and preliminary selection of Cinnamomum porrectum seedling of different provenances and families

比较广东省乳源县天井山林场、鹤山市宅梧镇、梅州市径南镇3个黄樟种源/家系试验林早期生长,为黄樟遗传改良提供理论依据。结果表明,3个试验点中黄樟的树高、地径在种源间和家系间都存在极显著的差异,种源、家系选择有效;地点、种源/家系、种源×地点、家系×地点互作的效应达到极显著水平,宅梧试验林生长最好,径南次之,天井山最差。在3个试验点上,树高、地径种源遗传力存在差异,但均表现出树高遗传力高于地径遗传力。不同试验点的树高、地径与经纬度的相关性均未达到显著性,地理变异趋势不明显。根据幼林长势及种源加性效应值和家系育种值,分别从3个试验点上初步选择出表现优良的种源和家系,优良家系的遗传增益均大于优良种源。

To compare the early growth of Cinnamomum porrectum provenances/families forests established in Tianjingshan Forest Farm,Zhaiwu town of Heshan city,Jingnan town of Meizhou city in Guangdong respectively,so as to provide theoretical basis for its genetic improvement.The results showed that：HT and GD both varied significantly among provenances and families at three sites,the selective effects of provenance and family is obvious.The effects of site,provenance,family,provenance by site interaction,family by site interaction were all significant,and growth of Zhaiwu experimental forest is best,Jingnan comes second,Tianjingshan is worst.Heritabilities of HT and GD both varied in the three experimental sites,but heritability of HT growth was always greater than that of GD.Most correlations between tree HT,GD and longitude,latitude didn＇t achieve significant correlation,growth traits geographic variation trend was not obvious.According to growth performance and provenance additive value,family breeding value,superior provenances and families were preliminarily selected in the three experimental sites,respectively;The genetic gains of superior families is greater than superior provenances.