Oxygen, pH, and Eh microprofiles around submerged macrophyte Vallisneria natans response to growing stages

3rd International Conference on Water Resource and Environment

地球科学;生态环境科学

Dong, B.^1 ; Wang, G.X.^2 ; Yu, H.G.^1

Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection, College of Resources and Environment, Linyi University, 276000, China^1

School of Environment, Nanjing Normal University, Nanjing

210023, China^2

关键词: Diffusive boundary layers;    Eutrophic water;    Growing period;    Microenvironments;    Photosynthetic capacity;    Steep gradients;    Submerged macrophyte;    Submerged plants;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/82/1/012026/pdf
DOI  :  10.1088/1755-1315/82/1/012026

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The periphyton, attached to the surfaces of submerged plants, has important effects on plant growth and development in eutrophic waters. Periphyton complicates the microenvironment of diffusive boundary layer around submerged plants. We researched periphyton characteristics, oxygen (O2), pH, and Eh microprofiles at various growing stages of Vallisneria natans. The results suggested that during the growing period of V. natans, O2concentration and pH decreased from 0 to 2 mm above the leaf surface, whereas the Eh increased. As V. natans grew, O2and pH gradually increased until they peaked during stable growing stages, while the Eh decreased. However, during the decline stage, O2and pH gradually decreased, and Eh increased. To summarise, O2and pH showed a unimodal pattern in response to the life cycle of V. natans, with the maximum levels during the stable growth stage and the minimum levels during the rapid growth and decline stages. Our study demonstrated that V. natans growth induced steep gradients in O2concentrations, pH, and Eh at the DBL by increasing the layer's thickness, macrophyte photosynthetic capacity, and periphyton biomass in eutrophic waters.