从河流到海湾的沉积有机碳来源的变化及其对人类活动的反应
Rijun Hu1, Donghan Li2, Jiandong Qiu3
1College of Marine Geo-Science, Ocean University of China, Qingdao, 266100, China; Key Lab of Submarine Geosciences and Prospecting Techniques, Ministry of Education, Qingdao, 266100, China.
Environmental research
|July 22, 2025
概括
人类活动显著影响河流和海湾沉积物有机碳 (OC). 污水和水产养殖重塑了沿海资源,强调需要考虑工业和农业对沿海生态系统的影响.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 海洋生物学 海洋生物学
背景情况:
- 人类活动极大地改变了水中沉积物的有机碳 (OC) 动态.
- 小到中型河流对这些人为变化非常敏感.
- 了解OC来源和封存对于沿海生态系统管理至关重要.
研究的目的:
- 调查莱州湾及其河流流入的OC的来源和封存情况.
- 评估不同的人类影响对OC分布的影响.
- 确定陆地和海洋来源对海湾沉积物的相对贡献.
主要方法:
- 分析总有机碳 (TOC) 和总 (TN).
- 稳定同位素分析 (δ13C, δ15N) 和C/N比.
- 有机物 (OM) 源分配的贝叶斯稳定同位素混合模型.
主要成果:
- 南海岸的河流为海洋提供了大量的OC流.
- 黄河和小清河主要从土壤中获取OM,污水输入较少.
- 白朗河,河和贾奥莱河显示OM主要来自污水和浮游植物.
- 莱州湾沉积物包括57%的陆地沉积物和43%的海洋沉积物,贝类生物沉积是关键.
- 污水排放和贝类养殖显著改变了OC来源和贡献.
结论:
- 人类活动,包括污水和水产养殖,已经重塑了从河流到海湾的OC连续性.
- 工业,农业和海洋水产养殖活动是河湾OC系统的关键驱动因素.
- 这些人为因素需要在沿海环境管理和研究中仔细考虑.
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