豆科固氮植物植株茎叶、根和根瘤的δ^(15)N值变异  

VARIATIONS OF δ 15 N VALUE IN SHOOTS,ROOTS AND NODULES OF N 2 FIXING PLANTS

作　　者：周克瑜[1] 施书莲[1] 杜丽娟[1] 曹亚澄[1] 孙国庆[1] 邢光熹[1] 

机构地区：[1]中国科学院南京土壤研究所

出　　处：《核农学报》1998年第2期105-111,共7页Journal of Nuclear Agricultural Sciences

基　　金：国家自然科学基金

摘　　要：由于生物固定的氮在植物体内迁移过程中存在着同位素分馏效应，导致豆科固氮植物不同部位的δ１５Ｎ值彼此各不相同，我们的结果证实，茎叶的１５Ｎ自然丰度普遍低于根，特别是低于根瘤。固氮百分率以茎叶的δ１５Ｎ值为参数计算较为合理。另外，砂培试验得到的δ１５Ｎａ值对于固氮百分率的计算也有很大的影响。Because of isotopic fractionation in plant fixed N 2 transport from nodules to shoots and leaves,δ 15 N values of vrious parts of leguminous N 2 fixing plant are different.The results of the experiment demonstrated that natural 15 N abundance of the shoot is generally lower than that of the root,and especially lower than that of the nodules.It is reasonable to calculate % Ndfa by using δ 15 N value of the shoot as parameter.Moreover,δ 15 N values obtainted from sand culture experiment also have a great influence on calculation of N 2 fixing percertage.

关 键 词：^15N自然丰度法 豆科固氮植物 同位素分馏效应 

分 类 号：S311[农业科学—作物栽培与耕作技术] S154.381[农业科学—农艺学]