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Spatial and Seasonal Variations of Sedimentary Organic Matter in a Subtropical Bay: Implication for Human Interventions

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  • Xuan Lu

    (College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, China
    Guangdong Province Key Laboratory for Coastal Ocean Variation and Disaster Prediction, Guangdong Ocean University, Zhanjiang 524088, China
    These authors contributed equally to this work.)

  • Fengxia Zhou

    (College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, China
    Guangdong Province Key Laboratory for Coastal Ocean Variation and Disaster Prediction, Guangdong Ocean University, Zhanjiang 524088, China
    These authors contributed equally to this work.)

  • Fajin Chen

    (College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, China
    Guangdong Province Key Laboratory for Coastal Ocean Variation and Disaster Prediction, Guangdong Ocean University, Zhanjiang 524088, China)

  • Qibin Lao

    (Marine Environmental Monitoring Center of Beihai, State Oceanic Administration, Beihai 536000, China)

  • Qingmei Zhu

    (College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, China
    Guangdong Province Key Laboratory for Coastal Ocean Variation and Disaster Prediction, Guangdong Ocean University, Zhanjiang 524088, China)

  • Yafei Meng

    (College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, China
    Guangdong Province Key Laboratory for Coastal Ocean Variation and Disaster Prediction, Guangdong Ocean University, Zhanjiang 524088, China)

  • Chunqing Chen

    (College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, China
    Guangdong Province Key Laboratory for Coastal Ocean Variation and Disaster Prediction, Guangdong Ocean University, Zhanjiang 524088, China)

Abstract

Elemental (total organic carbon (TOC) and total nitrogen (TN)) and stable carbon and nitrogen isotope compositions (δ 13 C and δ 15 N, respectively) in the surface sediment of Zhanjiang Bay (ZJB) in spring and summer were measured to study the spatial and seasonal changes of organic matter (OM) and assess the human-induced and environment-induced changes in the area. The OM in the surface sediment of ZJB was a mixture of terrestrial and marine sources, and was dominated by marine OM (54.9% ± 15.2%). Compared to the central ZJB, the channel and coastal ZJB areas had higher δ 13 C and δ 15 N values, higher TOC and TN concentrations, and lower TOC/TN ratios, indicating higher primary productivity and higher percentages of marine OM in the latter two subregions. Mariculture activities, sewage inputs, and dredging were responsible for these phenomena. Clear seasonal variations in OM were observed in ZJB. The average proportions of terrestrial OM in summer increased by 10.2% in the ZJB channel and 26.0% in the coastal ZJB area compared with those in spring. Heavy rainfall brought a large amount of terrestrial OM into the channel and coastal ZJB areas, leading to the increase of the terrestrial OM fraction in these two subregions in summer. In summary, anthropogenic influences had a significant influence on the spatial and seasonal variations of sedimentary OM in ZJB.

Suggested Citation

  • Xuan Lu & Fengxia Zhou & Fajin Chen & Qibin Lao & Qingmei Zhu & Yafei Meng & Chunqing Chen, 2020. "Spatial and Seasonal Variations of Sedimentary Organic Matter in a Subtropical Bay: Implication for Human Interventions," IJERPH, MDPI, vol. 17(4), pages 1-20, February.
    • Handle: RePEc:gam:jijerp:v:17:y:2020:i:4:p:1362-:d:322915
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    References listed on IDEAS

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    1. Hilairy E. Hartnett & Richard G. Keil & John I. Hedges & Allan H. Devol, 1998. "Influence of oxygen exposure time on organic carbon preservation in continental margin sediments," Nature, Nature, vol. 391(6667), pages 572-575, February.
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    Cited by:

    1. Han-Saem Lee & Jin Hur & Yu-Hoon Hwang & Hyun-Sang Shin, 2020. "A Novel Procedure of Total Organic Carbon Analysis for Water Samples Containing Suspended Solids with Alkaline Extraction and Homogeneity Evaluation by Turbidity," IJERPH, MDPI, vol. 17(11), pages 1-13, May.
    2. Shuangling Wang & Fengxia Zhou & Fajin Chen & Yafei Meng & Qingmei Zhu, 2021. "Spatiotemporal Distribution Characteristics of Nutrients in the Drowned Tidal Inlet under the Influence of Tides: A Case Study of Zhanjiang Bay, China," IJERPH, MDPI, vol. 18(4), pages 1-21, February.

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