Soil amendment leads to shifts in the rhizosphere microbial community and promotes Myriophyllum spicatum growth: a salinized aquatic system mesocosm experiment

Date

2025-01-01

Author

Ren, Qing
Sun, Shangsheng
Su, Yuqing
Ding, Qi
Xu, Houtao
Shuang, Lian
Jeppesen, Erik
Zhang, Wei
Wang, Liqing

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The escalating salinization of lakes and wetlands is reducing the ecological functions of these ecosystems and undermines the survival and diversity of aquatic macrophytes. Although the application of amendments has been shown to efficiently alleviate the salinization of terrestrial ecosystems, their improvement effects on saline aquatic ecosystems are yet to be fully understood. We conducted mesocosms experiment to investigate the effects of three soil amendment treatments—biochar, desulfurized gypsum, and zeolite powder—on saline sediment and the submerged macrophyte Myriophyllum spicatum. The results showed that all three amendments effectively reduced salinity and pH in both the sediment and water column, thereby alleviating salt stress on M. spicatum, decreased the levels of antioxidant enzymes and significantly enhanced the growth of M. spicatum. The biochar treatment showed the most pronounced improvements, with a 34% reduction in sediment salinity and a 46% increase in macrophyte root length. High-throughput sequencing results revealed that the rhizosphere microorganisms in the biochar-amended group had a higher OTU diversity compared to the other groups. LEfSe analysis further revealed that biochar increased the abundance of the key functional microbial groups responsible for organic matter decomposition and the nitrogen and phosphorus cycles, such as Microscillaceae, Promicromonospora, and Arthrobacter. Structural equation modeling analysis suggested that desulfurized gypsum and zeolite powder primarily improved sediment physical properties, while biochar had both a direct effect by promoting macrophyte growth and an indirect effect through water and sediment quality amelioration. Our study provides information on the effectiveness of various soil amendments for habitat improvement in brackish wetlands and offers valuable insights for macrophyte restoration in specific habitats.

Subject Keywords

Amendments, Biochar, Lake salinization, Microorganisms, Myriophyllum spicatum

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https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=105000676596&origin=inward
https://hdl.handle.net/11511/114328

Collections

Department of Biology, Article