Abstract: Based on the principles of scientificity, holism, representativeness, and operability, thirteen evaluation indices were selected from the secondclass forest resources inventory data, and a health assessment index system of fastgrowing and highyielding Cunninghamia lanceolata plantations was constructed. In the meantime, the standard for classifying the C. lanceolata plantations health grade was ascertained, and the health status of the C. lanceolata plantations in 817 subcompartments of Huangfengqiao Forest Farm in Hunan Province was evaluated. Among the subcompartments, those in unhealthy, subhealthy, and healthy occupied 24.7%, 57.3%, and 18.0% of total, respectively. Young plantations had a poorer health condition, middleaged plantations were better, overmature plantations were generally in subhealthy, while nearmature and matured plantations were comparatively healthy. These results could provide reference for the health management of the C. lanceolata plantations in the Farm.

Key words: land consolidation, soil organic carbon,  soil microbial community diversity.