大型植物为主的富营养化湖泊的内部氮循环：生态恢复的机制和意义,ACS ES&T Water

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大型植物为主的富营养化湖泊的内部氮循环：生态恢复的机制和意义
ACS ES&T Water ( IF 4.8 ) Pub Date : 2021-10-28 , DOI: 10.1021/acsestwater.1c00203
Jing Zhang ₁ , Pengfei Hei ₁ , Yizi Shang ₂ , Jing Yang ₁ , Lu Wang ₁ , Tingting Yang ₁ , Gang Zhou ₃ , Feng Chen ₄

Affiliation

大型植物主导的富营养化（MDE）给湖泊管理带来了巨大挑战。然而，大型植物过度生长的研究主要局限于入侵生态学领域，富营养化研究主要局限于浮游植物主导的富营养化。在这项研究中，利用推断统计数据和来自几个故意选择的对比区域（即，有和没有大型植物以及有和没有水流）的 13 个半连通子湖中的野外尺度观测数据，研究了大型植物对内部氮循环的影响。基于前-后-控制-影响分析方法的单一大型 MDE 湖。该Ť影响和控制区域之间的测试，结合大型植物 N 库变化和垂直沉积物 N 扩散分析，表明大型植物生物动力学，而不是物理化学动力学，主导了可持续的内部 N 循环，导致 MDE 湖泊中的大型植物过度生长。沉积物氮在生长季节被大型植物吸收并储存，然后在枯萎期开始返回沉积物，形成可持续的内部氮循环。因此，富营养化的恢复应强调限制自我强制的“沉积物-大型植物”氮循环，而不是仅控制水氮含量或沉积物氮释放。综合考虑沉积物氮去除效率和生态中断，提出了一种实用的策略。

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Internal Nitrogen Cycle in Macrophyte-Dominated Eutrophic Lakes: Mechanisms and Implications for Ecological Restoration

Macrophyte-dominated eutrophication (MDE) poses great challenges to lake management. However, macrophyte overgrowth research has been mainly confined to the field of invasion ecology, and eutrophication research has been primarily limited to phytoplankton-dominated eutrophication. In this study, the impacts of macrophytes on the internal N cycle were studied utilizing inference statistics with field-scale observation data from several deliberately selected contrasting regions (i.e., with and without macrophytes and with and without water flow) in 13 semiconnected sublakes in a single large MDE lake based on the before–after–control–impact analysis method. The t test between the impact and control regions, combined with the macrophyte N stock variation and the vertical sediment N diffusion analysis, indicates that macrophyte biodynamics, not physiochemical dynamics, dominate the sustainable internal N cycle, leading to macrophyte overgrowth in MDE lakes. Sediment N is absorbed and stored in macrophytes during the growing season and then begins to return to sediment during the withering period, forming a sustainable internal N cycle. Therefore, the restoration of eutrophication should emphasize limiting the self-enforced “sediment–macrophyte” N cycle rather than controlling only water N content or sediment N release. A practical strategy was proposed using the synergetic considerations of both the sediment N removal efficiency and the ecological interruptions.

更新日期：2021-11-12

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