Comparison of Soil Microbial Biomass and Community Composition between Chinese Fir and Natural Secondary Forest at Different Growth Stages
A compared study was conducted on the soil microbial biomass and community composition at 0～10 cm soil depth in Chinese fir(Cunninghamia lanceolata)plantation and secondary forest at different stand ages,aimed to understand the effect of forest restoration on the soil microbial biomass and community composition.The results showed that the soil total microbial biomass and community composition of Chinese fir plantation and secondary forest did not change significantly with the increase of forest age.However,the soil total microbial biomass,bacterial biomass,fungal biomass in secondary forest were significantly higher than those in Chinese fir plantation at the same stand age.And the biomass ratio of gram-positive to gram-negative bacteria in secondary forest was significantly lower than that in Chinese fir plantation.Due to the higher litter input,soil total carbon and nitrogen content,secondary forests provided a large amount of carbon source and energy for soil microbes and stimulated their growth.However,due to the lower litter input and higher soil total phosphorus and sol-uble organic matter content,the soil total microbial biomass and the ratio of gram-positive to gram-negative bacteria were lower in Chinese fir plantation.Our results indicated that compared with Chinese fir plantation,natural secondary forest restoration would be beneficial for improving soil carbon availa-bility and microbial activity,thus promoting nutrient cycling and increasing forest productivity.
Cunninghamia lanceolataforest agesecondary forestforest restorationsoil microbial community
NETL
NSTL
万方数据
