在一个大热带河流中,有机物被异性质细菌浮游生物处理:元素组成和潜在的碳矿化相关性
Daniel Cuevas-Lara1, Felipe García-Oliva2, Salvador Sánchez-Carrillo3
1Programa de Posgrado en Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, México City, México.
PloS one
|November 11, 2024
概括
热带河流微生物根据其元素组成不同处理溶解有机物 (DOM). 在DOM的高碳/营养物比率,特别是在森林地区,降低了微生物效率和二氧化碳生产率.
科学领域:
- 环境微生物学 环境微生物学
- 河流生态 河流生态
- 生物地质化学生物地质化学
背景情况:
- 河流水文学显著影响排水盆地内溶解有机物 (DOM) 的特性.
- 了解DOM的微生物处理和热带河流中的营养循环仍然是一个关键的研究差距.
研究的目的:
- 调查元素DOM组成 (C/N/P比),碳和吸收以及乌苏马辛塔河细菌浮游生物的碳矿化之间的关系.
- 评估季节性水文变化 (雨季与干季) 和纵向河流梯度如何影响DOM处理.
主要方法:
- 进行了实验室实验,以测量DOM度变化和二氧化碳 (CO2) 生产速度.
- 在雨季和旱季期间,从中部和下部乌苏马辛塔河流域的三个地点采集了样本.
- 化实验 (120小时在25°C) 评估了DOM的减少和CO2的产生.
主要成果:
- 在化后,DOM减少了25-89%,在最初碳比例高的样本 (森林中盆地和过渡区) 中观察到较高的二氧化碳生产率 (>10 mg l-1 day-1).
- 与雨季相比,干旱季节溶解有机碳的吸收和酸盐/的产量在干旱季节更高.
- 干旱季节的低水流放大了DOM处理的特定地点差异,而雨季的高水流使这些因素均化.
结论:
- 微生物代谢在富含碳的环境 (如森林) 中效率降低,在DOM中C/N和C/P比率高.
- 热带水文系统和纵向河流梯度通过控制DOM特征,显著影响微生物代谢.
- 河流DOM中的元素比率对于了解其由水生微生物处理至关重要.
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