Epipelon biomass responses to different restoration techniques in a eutrophic environment

Abstract

Eutrophication is a worldwide problem. In eutrophic shallow lakes, phosphorus release from stored sediment hinders restoration processes. The epipelon is a community that grows attached to the sediment surface and has the potential to help P retention by autotrophic organisms. This study evaluated epipelon responses to four shallow lake restoration techniques. The responses of abiotic variables and phytoplankton biomass were also evaluated. Four simultaneous mesocosm experiments were performed in a shallow eutrophic lake. The applied techniques were aeration, occulant, oating macrophytes, and periphyton bioreactor. Water and epipelon samples were taken on days 3, 10, 17, 27, and 60. The aeration treatment and macrophytes shaded the epipelon, which had a predominance of heterotrophic components. Flocculant and periphyton bioreactor treatments favored epipelon growth with a higher contribution of autotrophic components. Therefore, some techniques may favor the epipelon growth, while others may harm the community in restoration processes. For the complete restoration of a lacustrine ecosystem, the choice of techniques to be applied must consider the restoration and maintenance of the benthic environment.

Identification and Distribution Characteristics of Odorous Compounds in Sediments of a Shallow Water Reservoir

“…Chen et al investigated the structure and function of microbial communities during river restoration, demonstrating a close relationship between microorganisms and the release of odors from sediment [34]. Therefore, various strategies have been developed, including artificial aeration, water circulation, chemical oxidation, microbial enhancement, and artificial floating islands, to increase the dissolved oxygen content in water and reduce the concentration of pollutants [35][36][37][38][39][40][41][42][43]. However, single physical or chemical methods have limitations and cannot effectively solve the problem of odor pollution from sediments.…”