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Citation:

Effects of N-fixing Tree Species on Soil Microbial Biomass and Community Structure of the Second Rotation Eucalyptus Plantations

  • Received Date: 2013-06-28
  • In order to determine the effects of N-fixing tree species on the biomass and structure of soil microbial community of the second rotation Eucalyptus plantations in subtropical China, The phospholipid fatty acid (PLFA) analysis was used to quantify the microbial community biomass and composition in Eucalyptus urophylla monoculture forest and a mixed Eucalyptus urophylla and Dalbergia odorifera forest on dry and wet season. The results showed that the soil organic carbon content, NH4-N, NO3-N, TN, and litter biomass in mixed forest were significantly higher by 17.77%, 41.62%, 85.59%, 25.38%, 19.12% compared with that in monoculture forest at 0~10 cm depth except soil carbon content. Also in the mixed forest, the bacterial community biomass significantly increased, but the fungal community biomass was significantly reduced. Likewise, the relative abundances of total bacterial community, Gram-positive bacterial communities were significantly increased in dry season, but the relative abundance of fungal communities were significantly declined. No significant difference was found in the relative abundance of other microbial communities between the two forests in wet season, except the total bacteria. The results of principal component analysis (PCA) showed that the soil microbial community structure in mixed forest was clearly separated from the monoculture forest on the PC2 axis (p4-N, and TOC were the dominant factors driving the changes of soil microbial community composition of the second rotation Eucalyptus plantations in subtropical China. In addiction, the trench experiment showed that the root and root secreting labile material may be the important sources of microbial biomass carbon in the second rotation Eucalyptus plantations.
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Effects of N-fixing Tree Species on Soil Microbial Biomass and Community Structure of the Second Rotation Eucalyptus Plantations

  • 1. Key Laboratory of Forest Ecology and Environment, State Forestry Administration, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China
  • 2. Ministry of Education Key Laboratory for Silviculture and Conservation, Beijing Forest University, Beijing 100083, China

Abstract: In order to determine the effects of N-fixing tree species on the biomass and structure of soil microbial community of the second rotation Eucalyptus plantations in subtropical China, The phospholipid fatty acid (PLFA) analysis was used to quantify the microbial community biomass and composition in Eucalyptus urophylla monoculture forest and a mixed Eucalyptus urophylla and Dalbergia odorifera forest on dry and wet season. The results showed that the soil organic carbon content, NH4-N, NO3-N, TN, and litter biomass in mixed forest were significantly higher by 17.77%, 41.62%, 85.59%, 25.38%, 19.12% compared with that in monoculture forest at 0~10 cm depth except soil carbon content. Also in the mixed forest, the bacterial community biomass significantly increased, but the fungal community biomass was significantly reduced. Likewise, the relative abundances of total bacterial community, Gram-positive bacterial communities were significantly increased in dry season, but the relative abundance of fungal communities were significantly declined. No significant difference was found in the relative abundance of other microbial communities between the two forests in wet season, except the total bacteria. The results of principal component analysis (PCA) showed that the soil microbial community structure in mixed forest was clearly separated from the monoculture forest on the PC2 axis (p4-N, and TOC were the dominant factors driving the changes of soil microbial community composition of the second rotation Eucalyptus plantations in subtropical China. In addiction, the trench experiment showed that the root and root secreting labile material may be the important sources of microbial biomass carbon in the second rotation Eucalyptus plantations.

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