植物根系—微生物联合固氮的发现,为研究禾本科作物利用空中氮素开辟了一条新途径。这一类固氮作用既不同于典型的共生固氮,因为它没有根瘤一样的特殊形态结构,也不同于自生固氮,因为它具有专一性的联合植物。联合固氮的细菌生活于植物根表或根的皮层,从植物取得养料进行固氮,然后以固定的氮素供植物吸 The discovery of plant root-microbes combined nitrogen fixation opened up a new way to study the utilization of aerial nitrogen by gramineous crops. This type of nitrogen fixation is different from the typical symbiotic nitrogen fixation because it has no nodule-like special morphological structure and is not the same as autotrophic nitrogen because it has a unique combination of plants. Nitrogen-binding bacteria living in the plant root surface or root cortex, obtained from the plant nutrients for nitrogen fixation, and then to a fixed nitrogen for plant absorption