| field assessment of symbiotic n2 fixation in wild and cultivated cyclopia species in the south african fynbos by 15n natural abundance. | nitrogen (n) derived from symbiotic fixation of atmospheric n(2) in wild and cultivated populations of cyclopia, a woody endemic genus used to make honeybush tea in the western cape of south africa, was quantified by the (15)n natural abundance method. because cyclopia species are naturally mycorrhizal, non-n(2)-fixing arbuscular mycorrhizal shrubs of similar phenology to cyclopia were chosen as reference plants to provide the delta(15)n value of soil-derived n. isotopic analysis showed that wil ... | 2009 | 19203949 |