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甘河-布拉姆普特拉-梅格纳河系统中的积累和衰减:使用多种稳定同位素和微生物群的评估

Shan Jiang¹, Md Jaker Hossain¹, Sheikh Aftab Uddin²

¹State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, China.

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概括

溶解的无机 (DIN) 主要是酸盐,由于废水和肥料,在河-布拉马普特拉-梅赫纳河流系统中积累. 河口化导致进一步的酸盐积累,然后在稀释和同化降低沿海海洋附近的DIN.

科学领域:

环境化学环境化学
河流和河口科学
生物地质化学生物地质化学

背景情况:

河-布拉姆普特拉-梅格纳 (GBM) 河流系统是营养物质运输到孟加拉湾的主要途径.
了解溶解无机 (DIN) 动态对于管理水质和生态系统健康至关重要.
人类活动显著影响大型河流系统中的循环.

研究的目的:

调查GBM河系统下流和河口中溶解无机 (DIN) 的积累和减弱过程.
确定DIN的主导形式及其在河流和河口环境中的来源.
评估控制DIN度的因素及其在向沿海海洋过渡时的命运.

主要方法:

在GBM下游河流和河口的地表和地下水的实地采样.
化学分析以确定酸盐 (NO3-),和其他DIN成分的度.
稳定同位素分析 (15N-NO3和18O-NO3) 以追踪酸盐的来源.
评估河口中化率和微生物群落组成.

主要成果:

酸盐 (NO3-) 是 GBM 下游河流中占主导地位的 DIN 成分 (>90%),表面水和底水之间存在很小的差异.
同位素签名表明,市政废水和农业肥料可能是酸盐的主要来源.
梅格纳河的氨度增加,这与工业区的污水排放有关.
在河口,高化率超过了去除,导致酸盐的积累.
由于海水稀释和生物同化,DIN度在沿海海洋下降.

结论:

GBM河流系统经历了大量的酸盐积累,主要是由人为输入驱动的.
河口化在向沿海区排放之前,在放大酸盐水平方面发挥着关键作用.
河流和河口环境表现出强烈的联系,DIN输入影响接收沿海水的生态稳定性.

关键词:

河 - 布拉姆普特拉 - 梅格纳主要离子是主要的离子.微生物群中的微生物群气气是一种气.稳定的同位素是稳定的.

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