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题名: Effects of high nitrogen concentrations on the growth of submersed macrophytes at moderate phosphorus concentrations
作者: Yu, Qing1, 2; Wang, Hong-Zhu1; Li, Yan1, 2; Shao, Jian-Chun1, 3; Liang, Xiao-Min1; Jeppesen, Erik4, 5, 6; Wang, Hai-Jun1
关键词: Whole-ecosystem experiment ; Submersed macrophytes ; Nitrogen ; Phosphorus ; Phytoplankton ; Periphyton
刊名: WATER RESEARCH
发表日期: 2015-10-15
DOI: 10.1016/j.watres.2015.06.053
卷: 83, 页:385-395
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ; Technology ; Life Sciences & Biomedicine ; Physical Sciences
类目[WOS]: Engineering, Environmental ; Environmental Sciences ; Water Resources
研究领域[WOS]: Engineering ; Environmental Sciences & Ecology ; Water Resources
英文摘要: Eutrophication of lakes leading to loss of submersed macrophytes and higher turbidity is a worldwide phenomenon, attributed to excessive loading of phosphorus (P). However, recently, the role of nitrogen (N) for macrophyte recession has received increasing attention. Due to the close relationship between N and P loading, disentanglement of the specific effects of these two nutrients is often difficult, and some controversy still exists as to the effects of N. We studied the effects of N on submersed macrophytes represented by Vallisneria natans (Lour.) Hara in pots positioned at three depths (0.4 m, 0.8 m, and 1.2 m to form a gradient of underwater light conditions) in 10 large ponds having moderate concentrations of P (TP 0.03 +/- 0.04 mg L-1) and five targeted concentrations of total nitrogen (TN) (0.5, 2, 10, 20, and 100 mg L-1), there were two ponds for each treatment. To study the potential shading effects of other primary producers, we also measured the biomass of phytoplankton (Chlap(hyt)) and periphyton (Chla(peri)) expressed as chlorophyll a. We found that leaf length, leaf mass, and root length of macrophytes declined with increasing concentrations of TN and ammonium, while shoot number and root mass did not. All the measured growth indices of macrophytes declined significantly with Chla(phyt), while none were significantly related to Chla(peri). Neither Chla(phyt) nor Chlaped were, however, significantly negatively related to the various N concentrations. Our results indicate that shading by phytoplankton unrelated to the variation in N loading and perhaps toxic stress exerted by high nitrogen were responsible for the decline in macrophyte growth. (C) 2015 Elsevier Ltd. All rights reserved.
关键词[WOS]: SHALLOW LAKES ; MESOCOSM EXPERIMENT ; POTAMOGETON-CRISPUS ; SPECIES RICHNESS ; PLANT BIOMASS ; REGIME SHIFTS ; HIGH AMMONIUM ; FRESH-WATER ; EUTROPHICATION ; PERIPHYTON
语种: 英语
WOS记录号: WOS:000360418000039
ISSN号: 0043-1354
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/342005/27151
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, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Huazhong Agr Univ, Wuhan 430070, Peoples R China
4.Aarhus Univ, Dept Biosci, DK-8600 Silkeborg, Denmark
5.Aarhus Univ, Arctic Res Ctr, DK-8600 Silkeborg, Denmark
6.Sino Danish Ctr Educ & Res SDC, Beijing, Peoples R China
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