The associativenitrogenfixing bacterium was investigated in six typical Camellia forests with different managements, site conditions and ages in Hunan province. Screening nitrogen strains were carried out and their nitrogen ability was detected by nitrogen efficiency.The analysis of Azotobacter populations indicates that the wild>the planted forest, mountainous forest>flat(nursery), the adult forest>the young forest. The analysis of nitrogen efficiency indicated that the largest number of strains was distributed in the roots of wild adult forests. The results proved high nitrogen efficiency strains that can be separated from the Camellia, and it is the foundation to develop and apply bacterial fertilizer.
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