Characteristics of early eutrophication encoded in submerged vegetation beyond water quality: a case study in Lake Erhai, China

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• 作者：Liang He ; Tianshun Zhu ; Te Cao ; Wei Li ; Meng Zhang…
• 关键词：External nutrient loading ; Eutrophication ; Water quality parameters ; Submerged macrophytes ; Indicator
• 刊名：Environmental Earth Sciences
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：74
• 期：5
• 页码：3701-3708
• 全文大小：618 KB
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• 作者单位：Liang He (1) (2)
  Tianshun Zhu (1) (2)
  Te Cao (1)
  Wei Li (3)
  Meng Zhang (4)
  Xiaoling Zhang (1)
  Leyi Ni (1)
  Ping Xie (1)
  
  1. Donghu Experimental Station of Lake Ecosystems, State Key Laboratory for Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Chinese Academy of Sciences, 7# Donghu South Road, Wuhan, 430072, China
  2. University of Chinese Academy of Sciences, Beijing, 100049, China
  3. Institute of Ecology and Environmental Science, Nanchang Institute of Technology, Nanchang, 330099, China
  4. Jiangxi Academy of Environmental Science, Nanchang, 330029, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：None Assigned
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-6299

文摘

As external nutrients inputs above a critical level may drive shallow lakes to shift from clear water to a turbid state, it is important to detect ecological changes of the lake at an early stage of the eutrophication process. In this way, it is possible to assess the stress tolerance of the system and thereby improve the possibilities for proper management. In this study, water quality parameters and the biomass of submerged macrophytes were examined monthly in two bays receiving contrast amounts of nutrient input of a large mesotrophic lake from August, 2011 to July, 2012. We found that effects of external nutrient input could not be explained by differences between the two bays in water quality parameters, such as total nitrogen, total phosphorus, chlorophyll a, light attenuation coefficient and water transparency (Secchi depth), but by the species composition and temporal variation of submerged vegetation. In the progress of eutrophication, the submerged macrophyte community changed from Potamogeton maackianus dominance to co-dominance of Ceratophyllum demersum and P. maackianus, and became more seasonally variable in biomass and coverage due to the shorter survivorship of C. demersum. We suggest that in the early stage of eutrophication, when submerged macrophytes are still abundant, water quality parameters should be coupled with monitoring of submerged vegetation to examine the effects of external nutrient loading on shallow lake ecosystems. Keywords External nutrient loading Eutrophication Water quality parameters Submerged macrophytes Indicator