Soil amendment leads to shifts in the rhizosphere microbial community and promotes Myriophyllum spicatum growth: a salinized aquatic system mesocosm experiment
Qing Ren, Shangsheng Sun, Yuqing Su, Qi Ding, Houtao Xu, Lian Shuang, Erik Jeppesen, Wei Zhang, Liqing Wang
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引用次数: 0
Abstract
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.
期刊介绍：
Aquatic Ecology publishes timely, peer-reviewed original papers relating to the ecology of fresh, brackish, estuarine and marine environments. Papers on fundamental and applied novel research in both the field and the laboratory, including descriptive or experimental studies, will be included in the journal. Preference will be given to studies that address timely and current topics and are integrative and critical in approach. We discourage papers that describe presence and abundance of aquatic biota in local habitats as well as papers that are pure systematic.
The journal provides a forum for the aquatic ecologist - limnologist and oceanologist alike- to discuss ecological issues related to processes and structures at different integration levels from individuals to populations, to communities and entire ecosystems.
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