有机物源转移的元素和同位素约束在一个热带城市化的河口-溪流系统中
Balaram Sahu1, Umesh Kumar Pradhan2
1CSIR- National Institute of Oceanography, Regional Centre Lokhandwala Rd. Andheri (W), Mumbai, 400053, India; Department of Sci & Tech. (Chemistry), University of Mumbai, Mumbai, 400098, India.
Marine pollution bulletin
|November 28, 2025
概括
像UTECS这样的城市河口中的有机物源自陆地和海洋,人类活动改变了其组成. 这项研究揭示了这些来源如何转移,影响碳循环和埋葬在这个重要的海洋生态系统.
科学领域:
- * 海洋地质化学
- * 河口科学 河口科学
- * 环境科学 环境科学
背景情况:
- * 了解有机物 (OM) 的来源是评估城市河口碳循环和封存的关键.
- 乌尔哈斯 - 坦恩 - 河口 - 溪流系统 (UTECS) 是印度西部的一个高度城市化的海洋环境.
- * UTECS 中的沉积物成分受到自然过程和显著的人为投入的影响.
研究的目的:
- * 调查UTECS中有机物质的来源.
- *分析沉积物核中的元素和同位素特征,以确定OM来源.
- * 估计有机碳埋葬率,了解控制OM分布和保存的因素.
主要方法:
- *分析沉积物核心中的元素 (有机碳,总) 和同位素 (δ13C,δ15N) 组成.
- *测量物理性质,包括颗粒大小 (D50),多孔性和散装密度.
- * 应用MixSIAR模型来量化OM源贡献.
- * 一级有机碳埋葬率的估计.
主要成果:
- * 有机碳,总和含量存在显著的空间和深度变化.
- * 沉积物核心显示出明显的元素和同位素特征,表明陆地和海洋OM的混合.
- *核心C1表现出主要的陆地OM输入的特征,而核心C2-C4显示出不断增加的海洋和人为贡献.
- * MixSIAR模型证实了C1中的陆地OM (70-80%) 转向C4中的植物浮游生物和盆地藻类 (~60%) 的转变.
- * 有机碳的埋葬率各不相同,在核心C4的更深层沉积物中最高为4.9毫克/公/年.
结论:
- *城市化和相关的土地使用变化改变了OM输入到UTECS.
- *水力动力学条件和人为碎片对OM的分布,混合物和保存有重大影响.
- *这些发现为城市化河口系统中的碳循环复杂性提供了关键的见解.
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