Effects of N and P enrichment on competition between phytoplankton and benthic algae in shallow lakes: a mesocosm study

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• 作者：Xiufeng Zhang (1) (2)
  Xueying Mei (1) (3)
  Ramesh D. Gulati (4)
  Zhengwen Liu (1) (2)
  
  1. Department of Ecology and Institute of Hydrobiology ; Jinan University ; Guangzhou ; 510632 ; China
  2. State Key Laboratory of Lake Science and Environment ; Institute of Geography and Limnology ; Chinese Academy of Sciences ; Nanjing ; 210008 ; China
  3. College of Resources and Environment ; Anhui Agricultural University ; Hefei ; 230036 ; China
  4. Department of Aquatic Ecology ; The Netherlands Institute of Ecology ; 6708 PB ; Wageningen ; The Netherlands
  
• 关键词：Benthic algae ; Phytoplankton ; Nutrient ; Resource competition ; Shallow lakes ; Eutrophication
• 刊名：Environmental Science and Pollution Research
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：22
• 期：6
• 页码：4418-4424
• 全文大小：333 KB
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• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Environment
  Atmospheric Protection, Air Quality Control and Air Pollution
  Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
  Industrial Pollution Prevention
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1614-7499

文摘

Competition for resources between coexisting phytoplankton and benthic algae, but with different habitats and roles in functioning of lake ecosystems, profoundly affects dynamics of shallow lakes in the process of eutrophication. An experiment was conducted to test the hypothesis that combined enrichment with nitrogen (N) and phosphorus (P) would be a greater benefit to phytoplankton than benthic algae. The growth of phytoplankton and benthic algae was measured as chlorophyll a (Chl a) in 12 shallow aquatic mesocosms supplemented with N, P, or both. We found that enrichment with N enhanced growth of benthic algae, but not phytoplankton. P enrichment had a negative effect on benthic algal growth, and no effect on the growth of phytoplankton. N+P enrichment had a negative effect on benthic algae, but enhanced the growth of phytoplankton, thus reducing the proportion of benthic algae contributing to the combined biomass of these two groups of primary producers. Thus, combined N+P enrichment is more favorable to phytoplankton in competition with benthic algae than enrichment with either N or P alone. Our study indicates that combined enrichment with N+P promotes the dominance of phytoplankton over benthic algae, with consequences for the trophic dynamics of shallow lake ecosystems.