title: [Changes in soil organic carbon and soil microbial functional diversity of Carya cathayensis plantations under intensive managements].
abstract: The change characteristics of soil organic carbon and microbial function diversity in Chinese hickory Carya cathayensis stands with different intensive-management durations (5, 10, 15 and 20 years) were studied. The results showed that soil total organic carbon (TOC), microbial biomass carbon (MBC), water-soluble organic carbon (WSOC) decreased significantly, while the stability of soil C pool increased significantly after the conversion from evergreen and deciduous broadleaf forest to intensively-managed forest (IMF). TOC, MBC and WSOC in the hickory forest soil decreased by 28.4%, 34.1% and 53.3% with 5-year intensive management, and by 38.6%, 48.9% and 64.1% with 20-year intensive management, respectively. The proportions of carboxyl C, phenolic C and aromatic C in the hickory forest soil all increased significantly, and the aromaticity of soil organic C increased by 23.0%. Soil microbial functional diversity decreased greatly af- ter intensive management of Chinese hickory forest. Significant differences in average well color development (AWCD) were found between the 0- and 5-year treatments and the 10-, 15- and 20- year treatments. The microbial diversity indexes (H) and evenness indexes (E) in the 0- and 5-year treatments were much greater than in the 10- and 20-year treatments. Correlation analysis showed that there were significant correlations among soil TOC, WSOC, MBC, AWCD, H and E.
authors.forename: Jia-Sen
authors.initials: JS
authors.lastname: Wu
authors.forename: Jin-Fang
authors.initials: JF
authors.lastname: Qian
authors.forename: Zhi-Peng
authors.initials: ZP
authors.lastname: Tong
authors.forename: Jian-Qin
authors.initials: JQ
authors.lastname: Huang
authors.forename: Ke-Li
authors.initials: KL
authors.lastname: Zhao
mesh_terms: D018533:Biomass; D002244:Carbon / Q000032:analysis*; D031325:Carya; D016468:Forestry; D065928:Forests; D009930:Organic Chemicals / Q000032:analysis; D012987:Soil / Q000737:chemistry*; D012988:Soil Microbiology
chemical_list: D009930:Organic Chemicals; D012987:Soil; D002244:Carbon