Effects of high nitrogen concentrations on the growth of submersed macrophytes at moderate phosphorus concentrations

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	Effects of high nitrogen concentrations on the growth of submersed macrophytes at moderate phosphorus concentrations
	Yu, Qing 1,2; Wang, Hong-Zhu 1; Li, Yan 1,2; Shao, Jian-Chun 1,3; Liang, Xiao-Min 1; Jeppesen, Erik 4,5,6; Wang, Hai-Jun 1
刊名	WATER RESEARCH
	2015-10-15
卷号	83 页码:385-395
关键词	Whole-ecosystem experiment Submersed macrophytes Nitrogen Phosphorus Phytoplankton Periphyton
ISSN号	0043-1354
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.
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
关键词[WOS]	SHALLOW LAKES ; MESOCOSM EXPERIMENT ; POTAMOGETON-CRISPUS ; SPECIES RICHNESS ; PLANT BIOMASS ; REGIME SHIFTS ; HIGH AMMONIUM ; FRESH-WATER ; EUTROPHICATION ; PERIPHYTON
收录类别	SCI
语种	英语
WOS记录号	WOS:000360418000039
内容类型	期刊论文
源URL	[http://ir.ihb.ac.cn/handle/342005/27151]
专题	水生生物研究所_淡水生态学研究中心_期刊论文
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
推荐引用方式 GB/T 7714	Yu, Qing,Wang, Hong-Zhu,Li, Yan,et al. Effects of high nitrogen concentrations on the growth of submersed macrophytes at moderate phosphorus concentrations[J]. WATER RESEARCH,2015,83:385-395.
APA	Yu, Qing.,Wang, Hong-Zhu.,Li, Yan.,Shao, Jian-Chun.,Liang, Xiao-Min.,...&Wang, Hai-Jun.(2015).Effects of high nitrogen concentrations on the growth of submersed macrophytes at moderate phosphorus concentrations.WATER RESEARCH,83,385-395.
MLA	Yu, Qing,et al."Effects of high nitrogen concentrations on the growth of submersed macrophytes at moderate phosphorus concentrations".WATER RESEARCH 83(2015):385-395.