菌藻互利共生关系以及可生物降解材料对其影响

Mutualism of Bacteria and Algae and the Effect of Biodegradable Materials on It

铜绿微囊藻-施氏假单胞菌之间存在着互利共生的关系,这种光养-异养微生物体系形成了一种营养循环。铜绿微囊藻以光合产物的形式产生和泄露有机物质,帮助异养生物生长。这种光养-异养微生物体系有助于能量和物质在食物链以至于水生食物网中传递,维持水体生态系统平衡。轻度富营养化水体中,水体微生物无法在与藻类争夺氮磷等营养元素中获得优势,藻类依然成为生物链中的优势环节,大量的能量与物质在此环节停止流动,导致水华的爆发。PHAs作为一种缓释碳源不仅可以为异养卫生提供容易利用的小分子有机化合物提高异养微生物的增殖速率和最大细胞密度,还能对异养微生物进行驯化,提高其利用藻细胞产生的难降解有机物的能力,进行反硝化作用,降低水体中的氮元素含量。从而抑制藻类过度生长,维持水生生态系统的稳定。

The mutualism between Microcystis aeruginosa and Pseudomonas stutzeri make great contribution to maintaining the balance of water ecosystem.This phototrophic heterotrophic microbial system forms a nutrient cycle.Microcystis aeruginosa produces and releases organic matter in the form of photosynthetic products,which helps heterotrophic growth.This phototrophic heterotrophic microbial system contributes to the transfer of energy and material in the food chain and even in the aquatic food web.In lightly eutrophic water,microorganisms can not compete with algae for nutrients such as nitrogen and phosphorus.Algae is still the dominant link in the biological chain.A large amount of energy and material stop flowing in this link,leading to the outbreak of water blooms.As a sustained-release carbon source,PHAs can not only provide easy to use small molecular organic compounds for heterotrophic microorganism,improve the proliferation rate and maximum cell density of heterotrophic microorganisms,but also domesticate heterotrophic microorganisms,improve their ability to utilize refractory organic matter produced by algae cells,conduct denitrification,and reduce the nitrogen content in water.So as to restrain the overgrowth of algae and maintain the stability of aquatic ecosystem.