Mangrove afforestation as an ecological control of invasive Spartina alterniflora fl ora affects rhizosphere soil physicochemical properties and bacterial community in a subtropical tidal estuarine wetland

文献类型： 外文期刊

第一作者： Wang, Jinwang

作者： Wang, Jinwang;Liu, Shuangshuang;Wei, Xin;Chen, Qiuxia;Liu, Xing;Lin, Xi;An, Xia;Zhou, Tianpei;Li, Qianchen

作者机构：

关键词： Coastal wetland; Biological invasion; Vegetation restoration; Kandelia obovata; Soil nutrients; Microbial community; Ecosystem resilience

期刊名称：PEERJ （ 影响因子：2.4； 五年影响因子：2.7 ）

ISSN： 2167-8359

年卷期： 2024 年 12 卷

页码：

收录情况： SCI

摘要： Background: The planting of mangroves is extensively used to control the invasive plant Spartina alterniflora fl ora in coastal wetlands. Different plant species release diverse sets of small organic compounds that affect rhizosphere conditions and support high levels of microbial activity. The root-associated microbial community is crucial for plant health and soil nutrient cycling, and for maintaining the stability of the wetland ecosystem. Methods: High-throughput sequencing was used to assess the structure and function of the soil bacterial communities in mudflat fl at soil and in the rhizosphere soils of S. alterniflora, fl ora , mangroves, and native plants in the Oujiang estuarine wetland, China. A distance-based redundancy analysis (based on Bray-Curtis - Curtis metrics) was used to identify key soil factors driving bacterial community structure. Results: S. alterniflora fl ora invasion and subsequent mangrove afforestation led to the formation of distinct bacterial communities. The main soil factors driving the structure of bacterial communities were electrical conductivity (EC), available potassium (AK), available phosphorus (AP), and organic matter (OM). S. alterniflora fl ora obviously increased EC, OM, available nitrogen (AN), and NO- - 3-N contents, and consequently attracted copiotrophic Bacteroidates to conduct invasion in the coastal areas. Mangroves, especially Kandelia obovata, , were suitable pioneer species for restoration and recruited beneficial fi cial Desulfobacterota and Bacilli to the rhizosphere. These conditions ultimately increased the contents of AP, available sulfur (AS), and AN in soil. The native plant species Carex scabrifolia and Suaeda glauca affected coastal saline soil primarily by decreasing the EC, rather than by increasing nutrient contents. The predicted functions of bacterial communities in rhizosphere soils were related to active catabolism, whereas those of the bacterial community in mudflat fl at soil were related to synthesis and resistance to environmental factors. Conclusions: Ecological restoration using K. obovata has effectively improved a degraded coastal wetland mainly through increasing phosphorus availability and promoting the succession of the microbial community.

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