Resources survey on symbiotic nodulations and nitrogen-fixing plants in Shanghai greenland

Nodulation status and nitrogen fixation were investigated. The host plants collected belong to 5 family 37 genera,totally 83 species. Among of them,33 genera 71 species were legume plants,the other 4 family 4 genera 12 species were non-leguminous plants. The results showed that 93% of root nodules ranged from 1 to 10 mm at the lateral root of hosts,with spherical or columnar in shape and white or yellowish-brown in color. Nitrogenase activity was from 0 to 10 μmol·g·h-1.