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题名: Morphological and biomechanical response to eutrophication and hydrodynamic stresses
作者: Zhu, Guorong1, 2; Yuan, Changbo1, 3; Di, Guilan2; Zhang, Meng4; Ni, Leyi1; Cao, Te1; Fang, Rongting2; wu, Gongguo5
关键词: Canopy-forming macrophytes ; Eutrophic lake ; Wind-wave disturbance ; Water depth ; Plant adjustment ; Stepwise regression analysis
刊名: SCIENCE OF THE TOTAL ENVIRONMENT
发表日期: 2018-05-01
DOI: 10.1016/j.scitotenv.2017.11.322
卷: 622, 页:421-435
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: Eutrophication and hydrodynamics determine the final distribution patterns of aquatic macrophytes; however, there is limited available knowledge regarding their interactive effects. Morphological and biomechanical responses to eutrophication and hydrodynamic stresses were assessed by sampling five abundant and dominant species, Potamogeton maackianus, P. pectinatus, P. lucens, Ceratophyllum demersum and Myriophyllum spicatum, in three macrophyte beds in Lake Erhai, Yunnan Province, China: one exposed to eutrophication and moderate southeast (SE) wind; one with mesotrophication, but sheltered by the lakeshore, with weak wind disturbance; and one with meso-eutrophication and strong SE wind. The results showed significant interactive effects of eutrophication and hydrodynamics on most biomechanical traits and some morphological traits, suggesting that aquatic macrophytes preferentially undergo biomechanical adjustments to resist the coexisting eutrophication and hydrodynamic stresses. In particular, hydrodynamics increased both the tensile force and tensile strain of P. maackianus under meso-eutrophication and dramatically decreased them in eutrophic areas, suggesting that eutrophication triggers mechanical failure in this species. Additionally, P. pectinatus, C. demersumand M. spicatum showed the lowest and highest values for the biomechanical variables (greater values for M. spicatum) in the most eutrophic and hydrodynamic areas, respectively, implying that increases in hydrodynamics primarily induce mechanical damage in eutrophic species. The plants generally exhibited greater tensile strain in both shallow and deep waters and the greatest tensile force at moderate depths. The stem cross-sectional area, plant height, stem length, internode length, and branch traits were all responsible for determining the biomechanical variables. This study reveals that hydrodynamic changes primarily induce mechanical damage in eutrophic species, whereas eutrophication triggers mechanical damage in sensitive species. (c) 2017 Published by Elsevier B.V.
关键词[WOS]: POTAMOGETON-PECTINATUS L ; PLANT MYRIOPHYLLUM-SPICATUM ; 3 SUBMERSED MACROPHYTES ; NORTHERN BALTIC PROPER ; AQUATIC PLANT ; WATER DEPTH ; MECHANICAL-PROPERTIES ; SPATIAL-DISTRIBUTION ; LIGHT AVAILABILITY ; PLASTIC RESPONSES
语种: 英语
项目资助者: National High Technology Research and Development Program of China(2012ZX07105-004) ; National Natural Science Foundation of China(31400402 ; Research Fund for the Doctoral Program of Higher Education of China(qd13049) ; Department of Science and Technology of Henan Province(142102310476) ; 31460130)
WOS记录号: WOS:000426349000044
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/342005/50664
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, Donghu Expt Stn Lake Ecosyst, Wuhan 430072, Hubei, Peoples R China
2.Henan Normal Univ, Coll Fisheries, Xinxiang 453007, Peoples R China
3.Univ Chinese Acad Sci, Beijing 10049, Peoples R China
4.Jiangxi Acad Environm Sci, Nanchang 330039, Jiangxi, Peoples R China
5.CNOOC EnerTech Safety & Environm Protect Co, Zhanjiang 524057, Peoples R China
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