对细菌浮游生物群体和由河流连接驱动的溶解有机物之间的相互作用的新见解
Jianghao Ji1, Xiong Cao2, Rui Wang2
1Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing, 100193, China; Center for Water and Ecology, State Key Laboratory of Regional Environment and Sustainability, School of Environment, Tsinghua University, Beijing, 100084, China.
Journal of environmental management
|January 20, 2026
概括
河改变溶解有机物 (DOM) 和细菌浮游生物,但连接性损失的影响尚不清楚. 较低的连接性增强了关键细菌对DOM的利用,影响了微生物与碳的相互作用.
科学领域:
- 环境科学 环境科学
- 微生物学 微生物学
- 生态生态学 生态生态学
背景情况:
- 河对水生生态系统产生重大影响,因为它改变了水文连接.
- 溶解有机物 (DOM) 组成和细菌浮游生物群落因这些变化而重塑.
- 在不同的河流连接下,DOM和细菌浮游生物之间的特定相互作用仍然不太清楚.
研究的目的:
- 调查水引起的河流连接变化如何调节DOM和细菌浮游生物群落之间的关系.
- 为了确定影响细菌浮游生物多样性和DOM利用途径的关键驱动因素,以响应连接梯度.
主要方法:
- 调查了Chishui河流域,分析了DOM组成和细菌浮游生物社区结构,跨越不同的连接级别.
- 采用部分最小平方路径建模来确定细菌浮游生物多样性的驱动因素.
- 评估了连接对DOM转化和细菌浮游生物利用的影响.
主要成果:
- 堤改变了DOM的组成,无论连接水平如何.
- 细菌浮游生物群落结构受到连接梯度的强烈影响,其中Gammaproteobacteria主导的连接性较低的地区.
- 总和电导率是细菌浮游生物多样性的关键驱动因素.
- 在较低的河流连接指数 (RCI) 上增加了细菌浮游生物多样性,负面调节了DOM组件和改变了利用途径.
- 在低RCI下长时间保持水分,提高了DOM转换和利用.
结论:
- 河流的连通性极为关键,它决定了水河流盆地的微生物与碳之间的相互作用.
- 堤建设通过调节DOM-细菌浮游生物动力学,导致级联生态效应.
- 了解这些相互作用对于管理受河流分裂影响的水生生态系统至关重要.
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