The invasive Alternanthera philoxeroides modifies the sediment microbiome in urban and periurban river wetlands

IF 2.5 3区 环境科学与生态学 Q2 BIODIVERSITY CONSERVATION Urban Ecosystems Pub Date : 2024-03-20 DOI:10.1007/s11252-024-01534-0
Tong Wang, Jinming Yang, Yongfeng Zhu, Zeyu Zhang, Xiaolong Chi, Zhen Sun, Chunlin Wang, Lizheng Fang, Hongrui Dou, Zhenghao Fan, Shimei Li, Chunhua Liu
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Abstract

Few studies have evaluated the invasive effects on soil properties in urban ecosystems. In this study, population density and impervious surface area were used to divide the two river wetlands of Qingdao City, China— River Zhangcun and River Wenquan—into urban and periurban types. Sediments were sampled from plots colonized by the invasive Alternanthera philoxeroides and the native Typha angustifolia in these two river wetlands. The sediment properties, including fertility, stoichiometry, microbial diversity indices (observed species, Chao1, Shannon’s diversity index and Simpson’s diversity index) and species composition, were evaluated and compared. We found similar fertility and stoichiometry between sediments derived from invasive and native species. A greater bacterial diversity was found in the sediment derived from A. philoxeroides in the periurban river, while a greater fungal diversity was merely shown for the Shannon’s diversity index of A. philoxeroides regardless of river types. In addition, more microbes relevant to nutrient cycling processes, such as denitrification, accumulated in response to invasion, which may have decreased the habitat quality and impeded the invasion of T. angustifolia into A. philoxeroides populations. The discrepancy in urbanization status affected the impact of plant colonization on sediment properties, and the opposite results were shown for the comparisons of sediment nitrogen availability and bacterial diversity between the two species. Urbanization discriminated the impact of invasion to some degree. The invasion of A. philoxeroides altered the sediment microbiome, and the potential plant‒soil feedback needs further investigation.

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入侵物种 Alternanthera philoxeroides 改变了城市和城郊河流湿地的沉积物微生物组
很少有研究评估入侵对城市生态系统土壤性质的影响。本研究利用人口密度和不透水表面积将中国青岛市的两处河流湿地--张村河和温泉河--划分为城市和近郊类型。沉积物取样于这两处河流湿地中的入侵植物鹅掌揪(Alternanthera philoxeroides)和原生植物香蒲(Typha angustifolia)定殖的地块。我们评估并比较了沉积物的特性,包括肥力、化学计量、微生物多样性指数(观察物种、Chao1、香农多样性指数和辛普森多样性指数)以及物种组成。我们发现,来自入侵物种和本地物种的沉积物具有相似的肥力和化学计量学。在城郊河流中发现,来自 A. philoxeroides 的沉积物中细菌的多样性更高,而 A. philoxeroides 的香农多样性指数则显示出更高的真菌多样性,与河流类型无关。此外,更多与营养循环过程(如反硝化)相关的微生物随着入侵而积累,这可能降低了栖息地的质量,阻碍了T. angustifolia对A. philoxeroides种群的入侵。城市化状况的差异影响了植物定殖对沉积物性质的影响,两种物种的沉积物氮可用性和细菌多样性的比较结果恰恰相反。城市化在一定程度上区分了入侵的影响。A.philoxeroides的入侵改变了沉积物微生物组,潜在的植物-土壤反馈还需要进一步研究。
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来源期刊
Urban Ecosystems
Urban Ecosystems BIODIVERSITY CONSERVATION-ECOLOGY
CiteScore
5.70
自引率
6.90%
发文量
113
期刊介绍: Urban Ecosystems is an international journal devoted to scientific investigations of urban environments and the relationships between socioeconomic and ecological structures and processes in urban environments. The scope of the journal is broad, including interactions between urban ecosystems and associated suburban and rural environments. Contributions may span a range of specific subject areas as they may apply to urban environments: biodiversity, biogeochemistry, conservation biology, wildlife and fisheries management, ecosystem ecology, ecosystem services, environmental chemistry, hydrology, landscape architecture, meteorology and climate, policy, population biology, social and human ecology, soil science, and urban planning.
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