title: Factors regulating trophic status in a large subtropical reservoir, China.
abstract: We evaluated a 4-year data set (July 2003 to June 2007) to assess the trophic state and its limiting factors of Three-Gorges Reservoir (TGR), China, a large subtropical reservoir. Based on Carlson-type trophic state index (TSI)(CHL), the trophic state of the system was oligotrophic (TSI(S) < 40) in most months after the reservoir became operational, although both TSI(TP) and TSI(TN) were higher than the critical value of eutrophic state (TSI(S) > 50). Using Carlson's (1991) two-dimensional approach, deviations of the TSI(S) indicated that factors other than phosphorus and nitrogen limited algal growth and that nonalgal particles affected light attenuation. These findings were further supported by the significant correlation among the values of TSI(CHL) - TSI(SD) and nonvolatile suspended solids and water residence time. The logarithmic model showed that an equivalent TSI(CHL) and TSI(SD) could be found at tau = 54 days in the TGR (Fig. 7). Accordingly, nonalgal particulates dominated light attenuation and limited algal biomass of the reservoir when tau < 54 days.
authors.affiliation: State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, People's Republic of China. xuyaoyang@ihb.ac.cn
authors.forename: Yaoyang
authors.initials: Y
authors.lastname: Xu
authors.forename: Qinghua
authors.initials: Q
authors.lastname: Cai
authors.forename: Xinqin
authors.initials: X
authors.lastname: Han
authors.forename: Meiling
authors.initials: M
authors.lastname: Shao
authors.forename: Ruiqiu
authors.initials: R
authors.lastname: Liu
mesh_terms: D044822:Biodiversity; D002681:China; D017753:Ecosystem; D004784:Environmental Monitoring; D005068:Eutrophication; D020387:Food Chain; D012621:Seasons; D014873:Water Pollutants / Q000032:analysis; D014881:Water Supply / Q000032:analysis*
chemical_list: D014873:Water Pollutants