Liu Yunli, Zou Yilingyun, Kong Lingwei, Bai Guoliang, Luo Feng, Liu Zisen, Wang Chuan, Ding Zimao, He Feng, Wu Zhenbin, Zhang Yi
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.
School of Engineering, Westlake University, Hangzhou, Zhejiang, 310024, China.
J Environ Manage. 2021 Jun 1;287:112308. doi: 10.1016/j.jenvman.2021.112308. Epub 2021 Mar 8.
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.
本研究首次探讨了黏土矿物膨润土对沉水植物黑藻生长过程及沉积物微环境的影响，旨在确定其是否适用于生态修复领域。实验中每月测定一次黑藻的生长指标、生理生化指标，同时研究根际微生物及沉积物理化性质的变化。结果表明，膨润土能有效促进黑藻生长。RB1/1和MB1/5处理组（膨润土与沉积物的质量比分别为1/1和1/5）的黑藻生长促进率最佳，分别为18.78%和11.79%。RB10组（沉积物与膨润土的质量比为10/1）的微生物多样性和丰度最高，其中OTUs、Shannon、Chao和Ace分别为1521.0、5.20、1712.26和1686.31。膨润土有利于根际微生物的繁殖，并进一步改变沉积物微环境的理化性质。从膨润土中溶解出的营养元素可能是促进黑藻生长的主要原因之一。该结果旨在证明膨润土可进一步作为富营养化浅水湖泊生态修复工程中的沉积物改良剂和生长介质。
