National University of Singapore Environmental Research Institute, National University of Singapore, 117411, Singapore; Singapore Centre of Environmental Engineering and Life Sciences, National University of Singapore, Singapore; Department of Biological Sciences, National University of Singapore, Singapore 117558, Singapore.
Singapore Centre of Environmental Engineering and Life Sciences, National University of Singapore, Singapore; Centre for Radiation Research Education and Innovation, The University of Adelaide, 5005, Australia.
Sci Total Environ. 2024 Nov 1;949:175152. doi: 10.1016/j.scitotenv.2024.175152. Epub 2024 Aug 2.
Riverine sediments are important habitats for microbial activity in naturalised waterways to provide potential ecosystem services that improve stormwater quality. Yet, little is known about the sources of these sediment microbes, and the factors shaping them. This study investigated the dominant source of sediments in a tropical naturalised urban waterway, using two Bayesian methods for microbial and isotopic C/N markers concurrently. Additionally, key factors shaping microbial communities from the surrounding landscape were evaluated. A comprehensive two-year field survey identified source land covers of interest based on topology and soil context. Among these land covers, riverbanks were the dominant source of sediments contribution for both edaphic and microbial components. The physico-chemical environment explains most of the variation in sediment communities compared to inter-location distances and microbial source contribution. As microbes provide ecosystem services important for rewilding waterways, management strategies that establish diverse sediment microbial communities are encouraged. Since riverbanks play a disproportionately important role in material contribution to sediment beds, management practices aimed at controlling soil erosion from riverbanks can improve overall functioning of waterway systems.
河流沉积物是自然化水道中微生物活动的重要栖息地，可为改善雨水水质提供潜在的生态系统服务。然而，对于这些沉积物微生物的来源以及影响它们的因素知之甚少。本研究使用两种贝叶斯方法同时研究了热带自然化城市水道中沉积物的主要来源，该方法用于微生物和同位素 C/N 标记物。此外，还评估了塑造周围景观中微生物群落的关键因素。一项为期两年的综合野外调查根据拓扑结构和土壤背景确定了感兴趣的源土地覆盖。在这些土地覆盖中，河岸是土壤和微生物成分的主要沉积物来源。与位置间距离和微生物源贡献相比，物理化学环境解释了沉积物群落变化的大部分原因。由于微生物为重新野化水道提供了重要的生态系统服务，因此鼓励采取管理策略来建立多样化的沉积物微生物群落。由于河岸在物质向沉积物床的贡献中起着不成比例的重要作用，因此旨在控制河岸土壤侵蚀的管理实践可以改善水道系统的整体功能。
