从生物力学角度诠释富营养化引发的水生植物衰退机理

发布时间：2017-12-28 03:26

本文关键词：从生物力学角度诠释富营养化引发的水生植物衰退机理　出处：《湖泊科学》2017年05期 　论文类型：期刊论文

【摘要】：水体富营养化诱发的水生植物衰退机理已成为近年来水域生态学领域的研究热点.本文系统阐明了目前有关水生植物生物力学性能及其对水体富营养化的响应和其在该进程中水生植物衰退过程中的作用等研究进展.现有研究表明水生植物生物力学性能主要包括茎/叶/叶柄的抗拉性能(挺水植物为茎/叶柄的抗弯性能)和根的锚定性能;受水体富营养化主要环境变量(富营养底泥、水体高浓度氮磷和可利用光缺乏)的显著影响且具种间差异;还与生长、形态、生物量分配、组织结构、代谢等其他受水体富营养化显著影响的指标密切相关,且在应对水体富营养化时与生物力学间具有一定的协同作用;此外,生物力学性能受损不仅阻断植株的"生命进程",还严重削弱断枝后植株的资源获取能力和断枝的扩散定植能力,极大降低其适合度.根据野外调查和现有研究结果,生物力学性能的改变的确在富营养化水体水生植物衰退进程中起到关键作用.生态系统是多因子共同作用的综合系统,但目前的水生植物生物力学性能研究主要集中在水体富营养化的3大特征因子,亟需进一步深入系统开展随水体富营养化而改变的溶解氧、藻毒素、食草动物等其他因子的影响研究,以便更加全面真实地诠释水体富营养化造成水生植被衰退的生物力学机理.
[Abstract]:Eutrophication induced by aquatic plants decline mechanism has become a research hotspot in ecology field in recent years. This paper expounds the current research progress on the biomechanical properties of aquatic plants and its response to the eutrophication process and in the process of aquatic plants in the recession in its role. The current study shows that the tensile properties of aquatic plant biomechanics the performance including stem / leaf / petiole (aquatic plants as the stem / bending performance of petiole and root) anchoring performance; affected by eutrophication the main environmental variables (eutrophic water sediment, high concentrations of nitrogen and phosphorus and the lack of light) significantly influence and difference between species but also closely; related to growth, morphology, biomass allocation, organization structure, metabolism and other affected by eutrophication influence index and eutrophication in response to water and biomechanics between There is a synergistic effect; in addition, the biomechanical properties of damaged plants not only blocked the "life process", but also seriously undermine the broken branch after plant resource acquisition ability and the diffusion of broken branches colonization ability, greatly reducing their fitness. According to the field investigation and the existing research results, the changes of biomechanical properties indeed play a key role in the rich the water eutrophication of aquatic plants in the process of recession. The ecosystem is a comprehensive system of the interaction of multiple factors, but the research of aquatic plants on biomechanical properties of the current focus of the rich 3 characteristic factors in water eutrophication, effects need further development with the system of water eutrophication and the change of dissolved oxygen, algal toxins, herbivores other factors, in order to more fully and accurately interpret the eutrophication of aquatic vegetation caused by biomechanical mechanism of recession.
【作者单位】：河南师范大学水产学院;中国科学院水生生物研究所东湖湖泊生态系统试验站;江西省环境保护科学研究院;
【基金】：国家自然科学基金项目(31400402,31460130) 河南省科技厅项目(142102310476) 河南师范大学项目(qd13049)联合资助
【分类号】：Q948.8;X52
【正文快照】： ***国家自然科学基金项目(31400402,31460130)、河南省科技厅项目(142102310476)和河南师范大学项目(qd13049)联合资助.2016-06-15收稿;2016-10-21收修改稿.祝国荣(1982~),女,博士,讲师;E-mail:zhuguorong2012@hotmail.com.tions and laboratory experiments can imply that t

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