摘要
1996年秋采集桤木自然分布区四川盆地及其周边地区的19个产地的种子用于种源试验研究。苗期研究结果表明,在不同种源之间,种子性状(千粒质量、发芽率)、苗木生长性状(高径生长、分枝数、根茎比)、固N性状(根瘤量、固N酶活力、叶N量)和抗冻性等均存在显著或极显著的差异。不同性状变异量的相对大小和种源遗传力估计值高低顺序是:抗冻性>生长性状>固N性状。苗木生长性状与固N性状之间存在着较高的正向遗传相关,与抗冻性之间也有一定正相关。应用综合指数法筛选出南江、都江堰和金堂3个最优种源,可供生产单位参考应用。桤木苗木大多数性状与种子产地海拔高度呈负相关,与经度呈正相关,而与纬度关系轻微,呈现出以垂直变异为主、经向变异为次、纬向变异不明显的地理变异特点。
Trait variation in seedling stage of nineteen Alnus cremastogyne provenances from their native region Sichuan Basin and periphery mountain erea was studied. All of the traits, including 1 000 seeds weight, germination rate, seedling heiht(H) and base diameter(D) growth, root shout ratio for drying weight (RSR), nodulation weight(NOW), fixingnitrogenase livity(FNL), nitrogen counsulation in leaf(NCL), and resistance to freezing(REF),are significantly different among provenances. The trait variation and provenance heritability is that REF>growth traits>nitrogenfixing traits. There are higher positive genetic relations between growth traits and nitrogenfixing traits. The vast majority of seedling traits have negatively related with elevation of the seed source, especially significant for REF?D and H, and positively related with the longitude,especially significant for REF and NOW. FNL,RSR and REF have positive relation with latitude,others almost no relation with it. This specific property for geographical variation maybe depended on special environment in Sichuan Basin, where Alnus cremastogyne occupies.
出处
《林业科学研究》
CSCD
北大核心
2002年第6期680-686,共7页
Forest Research
基金
九五"国家攻关专题"长江中下游防护林植物材料选育和培育技术研究"(96 007 02 07)
关键词
桤木
种源变异
苗木生长
固氮能力
抗冻性
种源试验
Alnus cremastogyne
provenance variation
seedling growth
nitrogenfixing capacity
freezing resistance
