Effects of bentonite on the growth process of submerged macrophytes and sediment microenvironment

Yunli Liu; Yilingyun Zou; Lingwei Kong; Guoliang Bai; Feng Luo; Zisen Liu; Chuan Wang; Zimao Ding; Feng He; Zhenbin Wu; Yi Zhang

doi:10.1016/j.jenvman.2021.112308

Effects of bentonite on the growth process of submerged macrophytes and sediment microenvironment

J Environ Manage. 2021 Jun 1:287:112308. doi: 10.1016/j.jenvman.2021.112308. Epub 2021 Mar 8.

Authors

Yunli Liu¹, Yilingyun Zou¹, Lingwei Kong², Guoliang Bai³, Feng Luo⁴, Zisen Liu⁵, Chuan Wang⁶, Zimao Ding⁴, Feng He⁵, Zhenbin Wu⁵, Yi Zhang⁷

Affiliations

¹ State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
² School of Engineering, Westlake University, Hangzhou, Zhejiang, 310024, China.
³ School of Environmental Studies, China University of Geosciences, Wuhan, 430074, China.
⁴ School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, 430070, China.
⁵ State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China.
⁶ Faculty of Resources and Environmental Science, Hubei University, Wuhan, 430062, China.
⁷ State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China; University of Chinese Academy of Sciences, Beijing, 100049, China. Electronic address: zhangyi@ihb.ac.cn.

PMID: 33706092
DOI: 10.1016/j.jenvman.2021.112308

Abstract

The effects of clay mineral bentonite on the growth process of submerged macrophyte V. spiralis and sediment microenvironment were investigated in the study for the first time, aiming to determine whether it is suitable for application in the field of ecological restoration. The growth index, and physiological and biochemical index of V. spiralis in the experiments were measured once a month, and the changes of rhizosphere microorganisms and physicochemical properties of sediments were also studied at the same time. The results demonstrated that bentonite can effectively promote the growth of V. spiralis. The treatment groups of RB1/1 and MB1/5 (the mass ratios of bentonite to sediment were 1/1 and 1/5, respectively.) showed the best V. spiralis growth promotion rates which were 18.78%, and 11.79%, respectively. The highest microbial diversity and abundance existed in group of RB10 (the mass ratio of sediment to bentonite was 10/1), in which the OTUs, Shannon, Chao and Ace were 1521.0, 5.20, 1712.26, and 1686.31, respectively. Bentonite was conducive to the propagation of rhizosphere microorganisms, and further changed the physical and chemical properties of the sediment microenvironment. The nutrient elements dissolved from bentonite may be one of the main reasons that promoted the growth of V. spiralis. The purpose of this result is to prove that bentonite can be further applied as sediment improver and growing media in ecological restoration projects in eutrophic shallow lakes.

Keywords: Growth process; Modified bentonite; Rhizosphere microorganisms; Sediment microenvironment; V. spiralis.

MeSH terms

Bentonite*
Geologic Sediments*
Lakes
Minerals
Phosphorus
Rhizosphere

Substances

Minerals
Bentonite
Phosphorus