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题名: Can short-term and small-scale experiments reflect nutrient limitation on phytoplankton in natural lakes?
作者: Wang Haijun1; Li Yan1, 2; Feng Weisong1; Yu Qing1, 2; Xiao Xucheng1, 2; Liang Xiaomin1; Shao Jianchun3; Ma Shuonan1, 2; Wang Hongzhu1
关键词: eutrophication ; nutrient control ; extrapolation ; mesocosm experiment
刊名: CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY
发表日期: 2017-05-01
DOI: 10.1007/s00343-017-5251-1
卷: 35, 期:3, 页:546-556
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ; Life Sciences & Biomedicine ; Physical Sciences
类目[WOS]: Limnology ; Oceanography
研究领域[WOS]: Marine & Freshwater Biology ; Oceanography
英文摘要: Whether it is necessary to reduce nitrogen (N) and/or phosphorus (P) input to mitigate lake eutrophication is controversial. The controversy stems mainly from differences in time and space in previous studies that support the contrasting ideas. To test the response of phytoplankton to various combinations of nutrient control strategies in mesocosms and the possibility of reflecting the conditions in natural ecosystems with short-term experiments, a 9-month experiment was carried out in eight 800-L tanks with four nutrient level combinations (+N+P, -N+P, +N-P, and -N-P), with an 18-month whole-ecosystem experiment in eight similar to 800-m(2) ponds as the reference. Phytoplankton abundance was determined by P not N, regardless of the initial TN/TP level, which was in contrast to the nutrient limitation predicted by the N/P theory. Net natural N inputs were calculated to be 4.9, 6.8, 1.5, and 3.0 g in treatments +N+P, -N+P, +N-P, and -N-P, respectively, suggesting that N deficiency and P addition may promote natural N inputs to support phytoplankton development. However, the compensation process was slow, as suggested by an observed increase in TN after 3 weeks in -N+P and 2 months in -N-P in the tank experiment, and after 3 months in -N+P and similar to 3 months in -N-P in our pond experiment. Obviously, such a slow process cannot be simulated in short-term experiments. The natural N inputs cannot be explained by planktonic N-fixation because N-fixing cyanobacteria were scarce, which was probably because there was a limited pool of species in the tanks. Therefore, based on our results we argue that extrapolating short-term, small-scale experiments to large natural ecosystems does not give reliable, accurate results.
关键词[WOS]: MARINE ENVIRONMENTS ; EUTROPHICATION ; ENRICHMENT ; NITROGEN ; GROWTH
语种: 英语
项目资助者: State Key Laboratory of Freshwater Ecology and Biotechnology(2014FB14 ; Science and Technology Support Program of Hubei Province(2015BBA225) ; Youth Innovation Association of Chinese Academy of Sciences(2014312) ; 2011FBZ14)
WOS记录号: WOS:000399168400008
ISSN号: 0254-4059
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内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/342005/29204
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
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