Effects of arbuscular mycorrhizal fungus inoculation on the growth and nitrogen metabolism of <i>Catalpa bungei</i> C.A.Mey. under different nitrogen levels.

After inoculation with AMF, all root morphological parameters (except the average root diameter) and root activity of mycorrhizal seedlings showed a trend of first increasing and then decreasing, reaching the maximum at medium N and significantly higher than those at low and high N levels ( Table 2 ).

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