Briggs Michelle A
Pesticide Research Laboratory, Pennsylvania State University, 16802, University Park, PA, USA.
Oecologia. 1990 May;83(1):27-31. doi: 10.1007/BF00324629.
The carbon to nitrogen balance theory was examined for a legume, Lotus corniculatus L., which allocates carbon to nitrogen fixation. N-fixation can influence the ratio of carbon to nitrogen in legumes by providing nitrogen in nutrient-poor habitats, and by consuming carbon for support of symbiotic N-fixation. L. corniculatus clones (genotypes) were grown under two levels of nitrogen fertilization: a treatment which suppressed nodulation with fertilization and a treatment which received no additional fertilization. These plants relied solely on symbiotic N-fixation. Plants which supported symbionts had lower biomass and lower tannin concentrations than fertilized plants; this appears to be a result of the large carbon demand on N-fixation. Plants supporting symbionts often had relatively lower protein concentrations than fertilized plants. Cyanide concentration was influenced by plant genotype but not by nitrogen source. Although symbiotic N-fixing plants were smaller, they had three times the reproductive output of fertilized plants.
对豆科植物百脉根（Lotus corniculatus L.）的碳氮平衡理论进行了研究，该植物会将碳分配用于固氮。在养分贫瘠的栖息地，固氮作用通过提供氮以及消耗碳来支持共生固氮，从而影响豆科植物的碳氮比。百脉根克隆体（基因型）在两种氮肥水平下生长：一种是通过施肥抑制结瘤的处理，另一种是不额外施肥的处理。这些植物完全依赖共生固氮。与施肥的植物相比，供养共生体的植物生物量较低，单宁浓度也较低；这似乎是固氮对碳的大量需求所致。供养共生体的植物蛋白质浓度通常比施肥的植物相对较低。氰化物浓度受植物基因型影响，但不受氮源影响。尽管共生固氮植物较小，但它们的繁殖产量是施肥植物的三倍。
