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• 技术与方法 • 上一篇    

宁夏沙湖水生生态系统健康评估

米文宝1,2;樊新刚3;刘明丽4   

  1. 1宁夏大学资源环境学院, 银川 750021;
    2宁夏大学草业科学研究所, 银川 750021;
    3宁夏大学科学技术处, 银川 750021;
    4威海市金钰环保科技有限公司, 山东威海 264211
  • 收稿日期:2006-04-27 修回日期:2006-09-29 出版日期:2007-02-10 发布日期:2007-02-10

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

摘要: 以宁夏沙湖为例,选取pH值、悬浮物、溶解氧、化学耗氧量、生物耗氧量、总磷及铵氮等7项指标进行实测,并计算沙湖水体的综合污染指数,确定了水生环境的外部压力状态。计算并测量了沙湖水生生态系统在宏观尺度上的自由能、结构自由能,群落尺度上的浮游生物生物量、生产量及二者的比例关系,以判定其内部特征的变化情况。综合外部压力状态和内部特征指标体系的计算,结果表明,沙湖水生生态系统活力下降,生物周转速度慢,系统利用外界资源能力下降,种群增长受人为干扰,物种多样性下降,湖泊富营养化严重,并有进一步恶化趋势,目前处于不(或亚)健康状态。

关键词: 小城镇, 土地利用变化, 生态效应, 生物多样性

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