Effects of vermiculite on the growth process of submerged macrophyte Vallisneria spiralis and sediment microecological environment  

作　　者：Guoliang Bai Feng Luo Yilingyun Zou Yunli Liu Rou Wang Hang Yang Zisen Liu Junjun Chang Zhenbin Wu Yi Zhang 

机构地区：[1]State Key Laboratory of Freshwater Ecology and Biotechnology,Institute of Hydrobiology,Chinese Academy of Sciences,Wuhan 430072,China [2]School of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan 430070,China [3]University of Chinese Academy of Sciences,Beijing 100049,China [4]School of Environmental Studies,China University of Geosciences,Wuhan 430074,China [5]School of Ecology and Environmental Science,Yunnan University,Kunming 650091,China

出　　处：《Journal of Environmental Sciences》2022年第8期130-139,共10页环境科学学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Nos. 51709254;31830013);the Youth Innovation Promotion Association, Chinese Academy of Sciences (No. 2020335);the Natural Science Foundation of Hubei Province (No. 2020CFB555)。

摘　　要：Ecological restoration is one of the hot technologies for the reconstruction of eutrophic lake ecosystems in which the restoration and propagation of submerged plants is the key and difficult step. In this paper, the effect of vermiculite on the growth process of Vallisneria spiralis and sediment microenvironment were investigated, aiming to provide a theoretical basis for the application of vermiculite in aquatic ecological restoration. Results of growth indexes demonstrated that 5% and 10% vermiculite treatment groups statistically promote the growth of Vallisneria spiralis compared to the control. Meanwhile, the results of ecophysiological indexes showed that photosynthetic pigment, soluble sugar content, superoxide dismutase(SOD), and catalase(CAT) activity of 5% and 10% group were increased compared with the control while the malondialdehyde(MDA) content exhibited the opposite result(p < 0.05), which illustrated that vermiculite can improve the resistance of plants and delay the aging process of Vallisneria spiralis. In addition, result of PCA(Principal Component Analysis) demonstrated 5% and 10% group has improved the sediment physical conditions and create more ecological niche for microorganisms directly, and then promoted the growth of plants. The dissolution results showed that vermiculite can dissolve the constant and trace elements needed for plant growth. Furthermore, the addition of vermiculite increased the diversity of microorganisms in the sediments, and promoted the increase of plant growth-promoting bacteria and phosphorus-degrading bacteria. This study could provide a technique reference for the further application of vermiculite in the field of ecological restoration.

关 键 词：VERMICULITE Vallisneria spiralis SEDIMENT Growth and ecophysiological INDICATORS MICROENVIRONMENT 

分 类 号：X173[环境科学与工程—环境科学] X52