Abstract:

Phenolic contents in soils of Chinese fir and its adjacent broad leaved stands and in different rotation generations of Chinese fir were compared by paired sample T test method. The results indicated that: 1. The concentration of volatile phenol in soils of both Chinese fir and broad leaved stands were much lower than concentrations that cause damage to plants. 2. The content of volatile phenols varied with seasons and automatically reduced so quickly that one month later the average content of the phenols reduced up to 62.1%。The higher of the content of the soil was, the more it reduced. 3. The average content of water soluble and complex phenols in the soil of the broad leaved stand was higher than that of the Chinese fir, however, no significant differences between them were found. The amount of volatile phenol in soils of Chinese fir and broad leaved stands were about the same. 4. No significant differences of water and complex phenols in soils between different rotation generations of Chinese fir were observed. The results indicated that the possibility which the phenols accumulate in soil then become a toxic factor was low.

Key words: Cunninghamia lanceolata, Soil phenol, Successive planting