title: [Daily change of primary productivity of phytoplankton in saline-alkaline ponds].
abstract: Daily change of the primary productivity of phytoplankton in saline-alkaline ponds in Zhaodian Fishery Farm, Gaoqing County, Shandong Province, were estimated by means of dark and light bottle method, at the season of fish growth from April to September in 1997. The results showed that the primary productivity of phytoplankton in saline-alkaline ponds presents significant change during a day. And their distribution were correlated with some environmental factors such as light intensity, water temperature, the chlorophyll-a concentration etc. The measured values of primary production in continual exposure for 24 hour with dark and light bottle methods were greatly lower than the accumulated values of exposure for 2 hour. It is proposed that diurnal production calculated by the results of exposure for 4 hour between 10:00 and 14:00 was suitable in fish-culture ponds.
authors.affiliation: Department of Aquaculture, Dalian Fisheries University, Dalian 116023, China. zhaowen@mail.dlppt.ln.cn
authors.forename: Wen
authors.initials: W
authors.lastname: Zhao
authors.forename: Shuang-Lin
authors.initials: SL
authors.lastname: Dong
authors.forename: Zhaoqi
authors.initials: Z
authors.lastname: Zhang
authors.forename: Qingchun
authors.initials: Q
authors.lastname: Shentu
mesh_terms: D004777:Environment; D005618:Fresh Water; D008027:Light; D010839:Phytoplankton / Q000502:physiology*; D012965:Sodium Chloride
chemical_list: D012965:Sodium Chloride