张江河口红树林附近海水溶解/颗粒有机碳分配的空间变化及其机制

IF 2.1 4区 地球科学 Q2 MARINE & FRESHWATER BIOLOGY
Ran Yan , Jianxiang Feng , Huamei Huang , Jinhui Yan , Zhaoyong Zheng , Guanmin Huang , Qingshu Yang
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引用次数: 0

摘要

红树林是世界上碳含量最高的生态系统之一。本文于 2021 年 1 月在漳江口潮间带上界至入海口的 8 个采样点进行了洪水-潮间带采样,采集水样分析其理化性质、溶解性有机碳(DOC)和颗粒性有机碳(POC)。采集水样分析其理化性质、溶解性有机碳(DOC)和颗粒性有机碳(POC)含量,并研究其相组成,分析两相(溶解相和颗粒相)的空间变化及其影响因素。结果表明(1) DOC 为主要含量,含量范围为 0.48-3.29 mg-L-1,平均占 77.6%;POC 含量为 0.17-1.86 mg-L-1,平均占 22.4%。(2)河口悬浮泥沙以淤泥为主,平均占 68.0%;粘土占 17.5%,主要分布在红树林区;砂的比例最低。(3) 封闭式北江水闸和池塘排污均能显著增加水体有机碳含量,但只有池塘排污改变了有机碳的相态分布。在自然过程中,上河口颗粒物和溶解有机碳与溶解氧(DO)呈显著正相关(r >0.9),下河口颗粒物和溶解有机碳与盐度呈显著负相关(r <-0.7)。研究表明,溶解有机碳是主要含量,相分配系数因池塘污水中的溶解有机碳含量而显著增加。在自然过程中,河口上游微藻的自养活动和海水混合稀释后的异养活动是重要的影响因素。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Spatial variation and mechanism of the dissolved/particulate organic carbon partitioning of seawater adjacent to the mangrove in Zhangjiang Estuary

Mangrove is one of the most carbon-rich ecosystems in the world. Nevertheless, the understanding of organic carbon partitioning between dissolution and particle in the processes of mangrove outwelling is rather limited, flood–ebb samplings were conducted in January 2021 with 8 sampling sites covering the upper tidal boundary to the mouth in the Zhangjiang Estuary. Water samples were collected to analyze physicochemical properties, dissolved organic carbon (DOC) and particulate organic carbon (POC) contents, and their phase portioning were investigated to analyze the spatial variation between the two phases (dissolve and particle), and their influencing factors. The results showed: (1) DOC was the dominant content with the wide range of 0.48–3.29 mg·L−1, accounting for 77.6% on average; while POC contents were 0.17–1.86 mg·L−1, accounting for 22.4% on average. (2) Silt was dominant component in estuarine suspended sediment, accounting for 68.0% on average; clay accounted for 17.5% of the suspend sediment, and was mainly located in mangrove forest area; sand proportion was the lowest. (3) Both the closed Beijiang sluice and ponds effluents could significantly increase the water organic carbon content, but only ponds effluents changed the phase distribution of organic carbon. In natural processes, a significant positive correlation between particulate and dissolved organic carbon and dissolved oxygen (DO) in the upper estuary (r > 0.9), and a significant negative correlation between particulate and dissolved organic carbon and salinity in the lower estuary (r < −0.7) were observed. The study indicated that DOC was the dominant content, the phase partition coefficients were significantly increased due to the DOC content from pond effluents. In the natural processes, the autotrophic activities by microalgae in the upper estuary and the seawater mixed dilution followed with heterotrophic activities are the important influencing factors.

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来源期刊
Journal of Sea Research
Journal of Sea Research 地学-海洋学
CiteScore
3.20
自引率
5.00%
发文量
86
审稿时长
6-12 weeks
期刊介绍: The Journal of Sea Research is an international and multidisciplinary periodical on marine research, with an emphasis on the functioning of marine ecosystems in coastal and shelf seas, including intertidal, estuarine and brackish environments. As several subdisciplines add to this aim, manuscripts are welcome from the fields of marine biology, marine chemistry, marine sedimentology and physical oceanography, provided they add to the understanding of ecosystem processes.
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