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题名: EFFECTS OF SEDIMENT TYPE ON STEM MECHANICAL PROPERTIES OF THE SUBMERGED MACROPHYTE HYDRILLA VERTICILLATA (L.F.) ROYLE
作者: Zhu, Guorong1; Zhang, Meng1, 2; Cao, Te1; Ni, Leyi1; Zhong, Aiwen1; Fu, Hui1
通讯作者: Ni, LY (reprint author), Chinese Acad Sci, Donghu Expt Stn Lake Ecosyst, State Key Lab Freshwater Ecol & Biotechnol, Inst Hydrobiol, Wuhan 430072, Peoples R China.
关键词: Hydrilla varticillata ; sediment type ; mechanical properties ; segments ; cellulose content ; cross sectional area
刊名: FRESENIUS ENVIRONMENTAL BULLETIN
发表日期: 2012
卷: 21, 期:2A, 页:468-474
收录类别: SCI
文章类型: Article
部门归属: [Zhu, Guorong; Zhang, Meng; Cao, Te; Ni, Leyi; Zhong, Aiwen; Fu, Hui] Chinese Acad Sci, Donghu Expt Stn Lake Ecosyst, State Key Lab Freshwater Ecol & Biotechnol, Inst Hydrobiol, Wuhan 430072, Peoples R China; [Zhang, Meng] Jiangxi Acad Environm Sci, Nanchang 330029, Peoples R China
WOS标题词: Science & Technology ; Life Sciences & Biomedicine
资助者: National High Technology Research and Development Programs of China[2012ZX07105004, 2008ZX07106-2]
类目[WOS]: Environmental Sciences
研究领域[WOS]: Environmental Sciences & Ecology
摘要: The decline of submerged macrophytes during the eutrophication progress can be partly attributed to the adverse effects of fertile sediment on morphology and physiology of plants. However, little is known about its effects on mechanical properties, although this has been confirmed in terrestrial plants. In this study, the morphological traits, mechanical properties (tensile force, tensile stress and bending index) and cellulose content of Hydrilla verticillata grown on three types of sediment (sand, clay and loam) with different nutrient levels, were examined experimentally. Results showed that considerable variations in mechanical properties of plants were observed among the three sediments and along the stem, with the highest values in clay sediment and a decreased trend from the lower to upper segment, especially when grown in loam sediment, indicating that mesotrophic sediment benefits to higher mechanical resistance of stems than the other two sediments, and plants were prone to break at the other two segments, rather than the lower segment. Stem cross sectional area and internode length were significantly correlated with tensile force, and tensile stress was a linear function of stem cellulose content. Plants grown in clay sediment showed the shortest plant height and the maximum branch numbers, which are morphologically advantageous to reduce the hydraulic force. In conclusion, fertile sediment stimulated the plant growth at the expense of H. verticillata performance with respect to mechanical resistance. Decrease of mechanical resistance could contribute to the decline of submerged macrophytes with the enrichment of sediment nutrient during the process of eutrophication.
英文摘要: The decline of submerged macrophytes during the eutrophication progress can be partly attributed to the adverse effects of fertile sediment on morphology and physiology of plants. However, little is known about its effects on mechanical properties, although this has been confirmed in terrestrial plants. In this study, the morphological traits, mechanical properties (tensile force, tensile stress and bending index) and cellulose content of Hydrilla verticillata grown on three types of sediment (sand, clay and loam) with different nutrient levels, were examined experimentally. Results showed that considerable variations in mechanical properties of plants were observed among the three sediments and along the stem, with the highest values in clay sediment and a decreased trend from the lower to upper segment, especially when grown in loam sediment, indicating that mesotrophic sediment benefits to higher mechanical resistance of stems than the other two sediments, and plants were prone to break at the other two segments, rather than the lower segment. Stem cross sectional area and internode length were significantly correlated with tensile force, and tensile stress was a linear function of stem cellulose content. Plants grown in clay sediment showed the shortest plant height and the maximum branch numbers, which are morphologically advantageous to reduce the hydraulic force. In conclusion, fertile sediment stimulated the plant growth at the expense of H. verticillata performance with respect to mechanical resistance. Decrease of mechanical resistance could contribute to the decline of submerged macrophytes with the enrichment of sediment nutrient during the process of eutrophication.
关键词[WOS]: TRITICUM-AESTIVUM L. ; SHALLOW LAKES ; LODGING RESISTANCE ; HYDRAULIC FORCES ; GROWTH ; PLANTS ; WATER ; COMMUNITIES ; ADAPTATIONS ; COMPETITION
语种: 英语
WOS记录号: WOS:000302925300010
ISSN号: 1018-4619
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/342005/16873
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, Donghu Expt Stn Lake Ecosyst, State Key Lab Freshwater Ecol & Biotechnol, Inst Hydrobiol, Wuhan 430072, Peoples R China
2.Jiangxi Acad Environm Sci, Nanchang 330029, Peoples R China

Recommended Citation:
Zhu, Guorong; Zhang, Meng; Cao, Te; Ni, Leyi; Zhong, Aiwen; Fu, Hui.EFFECTS OF SEDIMENT TYPE ON STEM MECHANICAL PROPERTIES OF THE SUBMERGED MACROPHYTE HYDRILLA VERTICILLATA (L.F.) ROYLE,FRESENIUS ENVIRONMENTAL BULLETIN,2012,21(2A):468-474
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文件名: EFFECTS OF SEDIMENT TYPE ON STEM MECHANICAL PROPERTIES OF THE SUBMERGED MACROPHYTE HYDRILLA VERTICILLATA (L.F.) ROYLE.pdf
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