A study on the characteristics related to symbiotic nitrogen fixation of introduced legume trees in Maiji Arbortum

The nodulation and nitrogen fixation of 34 species belonging to 19 genura of legumes have been studied in Maiji Arbortum, in which 12 genura, 21 species were introduced and acclimatized legume trees. Among of them 9 species have not been reported yet in literature. 28 samples of nodules were detected with the method of acetylene reduction. There are only 25% of legume root nodules whose acetylene reduction activity is over 1 μmol/g·h. The highest of acetylene reduction activity in introduced trees is only 3.15 μmol/g·h.24 strains isolated were tested infecting in 8 species.91.6% strains of tested rhizobia can nodulate with host plants. The nodulation and symbiotic nitrogen fixation of introduced legume trees were discussed.