title: [Vertical distribution of physicochemical characteristics and the microbial diversity in different spatial sediments samples in Lake Taihu].
abstract: The physicochemical characteristics, nutritions and the microbial community diversity of sediment core samples of three different space locations in the Lake Taihu were studied by fumigation-digestion and PCR-DGGE analysis respectively. The results indicated that below the surface of sediments Eh declined rapidly with increase of sediment depth and it was under anaerobic condition except the top layer of sediment. pH value changed silightly in the profile of sediments, which ranged from 7.2 to 7.8. TN and TP concentrations in sediments of Lake Taihu were high,and the maximum concentrations reached 2.436 mg/g and 0.731 mg/g, respectively. Their vertical profiles showed that TN and TP concentrations in surface sediments were much higher than in deeper layers and decreased with the increase of the depth of sediment layers. OM concentrations declined rapidly at the top 15 cm of sediment layers. There were prominent difference spatially in microbial diversity and the comparability and dynamics of community structure between different sediment samples of different space locations and different depth. The little significant correlation at alpha < or = 0.05 level was observed between the Eh, pH, percentage organic matter, TN concentration and TP concentration and microbial community structure diversity index except of TN concentration and percentage organic matter.
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, China. nju_zhaoxq@163.com
authors.forename: Xing-qing
authors.initials: XQ
authors.lastname: Zhao
authors.forename: Liu-yan
authors.initials: LY
authors.lastname: Yang
authors.forename: Da-qiang
authors.initials: DQ
authors.lastname: Yin
authors.forename: Ru-cheng
authors.initials: RC
authors.lastname: Wang
authors.forename: Xian-cai
authors.initials: XC
authors.lastname: Lu
authors.forename: Bo-qiang
authors.initials: BQ
authors.lastname: Qin
mesh_terms: D001419:Bacteria / Q000145:classification / Q000235:genetics / Q000254:growth & development*; D044822:Biodiversity; D002681:China; D015169:Colony Count, Microbial; D004784:Environmental Monitoring; D005618:Fresh Water / Q000032:analysis*; D019015:Geologic Sediments / Q000737:chemistry* / Q000382:microbiology*; D014871:Water Microbiology