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Health assessment of Shahu Lake aquatic ecosystem in Ningxia

MI Wen-bao1,2; FAN Xin-gang3; LIU Ming-li4   

  1. 1College of Resource and Environment, Ningxia University, Yinchuan 750021, China;
    2Institute of Pratacultural Science, Ningxia University, Yinchuan 750021, China;
    3Department of Science and Technology, Ningxia University, Yinchuan 750021, China;
    4Weihai Jinyu Environmental Protection Technology Co., Ltd., Weihai 264211, Shandong, China
  • Received:2006-04-27 Revised:2006-09-29 Online:2007-02-10 Published:2007-02-10

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Abstract: In this paper, seven indices including pH, SS, DO, COD, BOD, TP and NH4+-N were measured to calculate the integrative pollution index of Shahu Lake in Ninxia and to evaluate the exterior stress on the aquatic ecosystem of the Lake. The exergy, structural exergy, and plankton’s biomass and productivity of the aquatic ecosystem were also investigated in macro-scale. The results showed that the Shahu Lake aquatic ecosystem had a decreased vigor. Its bio-logical turnover slowed down, utilization of environmental resources weakened, population in-crease was interfered by human activities, biodiversity decreased, and eutrophication tended to be severe and further deteriorated. The aquatic ecosystem of Shahu Lake was in non- or sub-healthy state.

Key words: Small town, Land-use change, Ecological effect, Biodiversity