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研究测定了百里荒牧场豆科牧草、禾本科牧草等34种不同植物茎叶样品及3个表土样品的~(15)N天然丰度值。利用δ~(15)N值的大小对牧草固氮能力进行初评。并就施肥对混播牧草固氮作用的影响及混播草地的固氮贡献进行讨论。
The natural abundance values of ~ (15) N in stem and leaf samples and three topsoil samples from 34 different plants, including leguminous pasture and gramineous pasture, were measured. The value of δ ~ (15) N was used to evaluate the nitrogen fixation ability of herbage. The effects of fertilization on nitrogen fixation of mixed-planting forages and nitrogen fixation contribution of mixed-sown grassland were discussed.