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题名: Does the responses of Vallisneria natans (Lour.) Hara to high nitrogen loading differ between the summer high-growth season and the low-growth season?
作者: Yu, Qing1, 2; Wang, Hai-Jun1; Wang, Hong-Zhu1; Li, Yan1, 2; Liang, Xiao-Min1; Xu, Chi3; Jeppesen, Erik4, 5, 6
关键词: Submersed macrophytes ; Ammonium ; Seasonality ; Free amino acid ; Phytoplankton ; Periphyton
刊名: SCIENCE OF THE TOTAL ENVIRONMENT
发表日期: 2017-12-01
DOI: 10.1016/j.scitotenv.2017.05.268
卷: 601, 页:1513-1521
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ; Life Sciences & Biomedicine
类目[WOS]: Environmental Sciences
研究领域[WOS]: Environmental Sciences & Ecology
英文摘要: Loss of submersed macrophytes is a world-wide phenomenon occurring when shallow lakes become eutrophic due to excess nutrient loading. In addition to the well-known effect of phosphorus, nitrogen as a trigger of macrophyte decline has received increasing attention. The precise impact of high nitrogen concentrations is debated, and the role of different candidate factors may well change over the season. In this study, we conducted experiments with Vallisneria natans during the growing season (June-September) in 10 ponds subjected to substantial differences in nitrogen loading (five targeted total nitrogen concentrations: control, 2, 10, 20, and 100 mg L-1) and compared the results with those obtained in our earlier published study from the low-growth season (December-April). Like in the low-growth season, growth of V. natans in summer declined with increasing ammonium (NH4) concentrations and particularly with increasing phytoplankton chlorophyll a (Chla(Phyt)). Accordingly, we propose that shading by phytoplankton might be of key importance for macrophyte decline, affecting also periphyton growth as periphyton chlorophyll a (Chla(Peri)) decreased with increasing Chla(Phyt). Free amino acid contents (FAA) of plants tended to increase with increasing NH4 concentrations, while the relationships between FAA with growth indices were all weak, suggesting that FAA might be a useful indicator of the physiological stress of the plants but not of macrophyte growth. Taken together, the results from the two seasonsindicate that although a combination of high nitrogen concentrations ( ammonium) and shading by phytoplankton may cause severe stress on macrophytes, active growth in the growing season enabled them to partly overcome the stress. (C) 2017 Elsevier B.V. All rights reserved.
关键词[WOS]: 3 SUBMERSED MACROPHYTES ; SHALLOW LAKES ; SPINULOSA HYDROCHARITACEAE ; POTAMOGETON-CRISPUS ; MESOCOSM EXPERIMENT ; LIGHT AVAILABILITY ; AMMONIA STRESS ; REGIME SHIFTS ; EUTROPHICATION ; METABOLISM
语种: 英语
项目资助者: State Key Laboratory of Freshwater Ecology and Biotechnology(2016FBZ09 ; Science and Technology Support Program of Hubei Province(2015BBA225) ; Youth Innovation Association of Chinese Academy of Sciences(2014312) ; MARS project (Managing Aquatic ecosystems and water Resources under multiple Stress) under the 7th EU Framework Programme, Theme 6 (Environment including Climate Change)(603378) ; AQUACOSM (Network of Leading European AQUAtic MesoCOSM Facilities Connecting Mountains to Oceans from the Arctic to the Mediterranean)(731065) ; CLEAR (a Villum Kann Rasmussen Centre of Excellence project) ; National Natural Science Foundation of China(41271197) ; 2014FB14 ; 2011FBZ14)
WOS记录号: WOS:000406294900148
ISSN号: 0048-9697
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内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/342005/33718
Appears in Collections:淡水生态学研究中心_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Hubei, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Nanjing Univ, Sch Life Sci, Nanjing 210093, Jiangsu, Peoples R China
4.Aarhus Univ, Dept Biosci, DK-8600 Silkeborg, Denmark
5.Aarhus Univ, Arct Res Ctr, DK-8600 Silkeborg, Denmark
6.Sino Danish Ctr Educ & Res SDC, Beijing, Peoples R China
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