Periphyton response to nitrogen and phosphorus enrichment in a eutrophic shallow aquatic ecosystem  

作　　者：张修峰 梅雪英 

机构地区：[1]Department of Ecology and Institute of Hydrobiology of Jinan University [2]Institute of Geography and Limnology,Chinese Academy of Sciences [3]College of Resources and Environment,Anhui Agricultural University

出　　处：《Chinese Journal of Oceanology and Limnology》2013年第1期59-64,共6页中国海洋湖沼学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China (No. 31100339);the Special Program of China Postdoctoral Science Foundation (No. 2012T50494);the National Basic Research Program of China (973 Program) (No. 2008CB418104)

摘　　要：We examined changes in biomass and species dominance of periphyton in response to nitrogen (N) and phosphorus (P) enrichment in 12 mesocosms representing eutrophic aquatic ecosystems. The 100-L mesocosms consisted of lake water and pond sediment, and N and P were applied weekly. Periphyton samples were taken to assess the biomass (as estimated by the concentration of chlorophyll a (chl a)) and to determine which species were dominant. The mean periphyton biomass (chl a) in the P-enriched treatment did not differ from that in the control group, but increased with N enrichment. Compared with that in the control group, the chl a concentration increased with N+P enrichment in the early stages of the experiment, but decreased in the later stages. The decline in periphyton biomass at the later stages of the experiment was due to limited light availability, which resulted from the increased phytoplankton density in the experiment. The nutrient enrichment treatments resulted in changes in the dominant algal species in the periphyton, suggesting that various algal species showed different responses to different nutrients. The results of this study have implications for nutrient management in aquatic ecosystems.We examined changes in biomass and species dominance ofperiphyton in response to nitrogen （N） and phosphorus （P） enrichment in 12 mesocosms representing eutrophic aquatic ecosystems. The 100-L mesocosms consisted of lake water and pond sediment, and N and P were applied weekly. Periphyton samples were taken to assess the biomass （as estimated by the concentration of chlorophyll a （chl a）） and to determine which species were dominant. The mean periphyton biomass （chl a） in the P-enriched treatment did not differ from that in the control group, but increased with N enrichment. Compared with that in the control group, the chl a concentration increased with N＋P enrichment in the early stages of the experiment, but decreased in the later stages. The decline in periphyton biomass at the later stages of the experiment was due to limited light availability, which resulted from the increased phytoplankton density in the experiment. The nutrient enrichment treatments resulted in changes in the dominant algal species in the periphyton, suggesting that various algal species showed different responses to different nutrients. The results of this study have implications for nutrient management in aquatic ecosystems.

关 键 词：PERIPHYTON EUTROPHIC NUTRIENTS aquatic ecosystem 

分 类 号：X173[环境科学与工程—环境科学]