Volume 17 Issue 1
Feb.  2021
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JIANG Rui, WU Yunchao, CHEN Pimao. Study on distribution of sediment carbon and nitrogen in mangrove wetland of Qi'ao Island, Pearl River Estuary[J]. South China Fisheries Science, 2021, 17(1): 1-9. DOI: 10.12131/20200143
Citation: JIANG Rui, WU Yunchao, CHEN Pimao. Study on distribution of sediment carbon and nitrogen in mangrove wetland of Qi'ao Island, Pearl River Estuary[J]. South China Fisheries Science, 2021, 17(1): 1-9. DOI: 10.12131/20200143
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Study on distribution of sediment carbon and nitrogen in mangrove wetland of Qi'ao Island, Pearl River Estuary

  • 1.

    South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences/Scientific Observing and Experimental Station of South China Sea Fishery Resources and Environment, Ministry of Agriculture and Rural Affairs/Guangdong Provincial Key Laboratory of Fishery Ecology and Environment, Guangzhou 510300, China

  • 2.

    South China Sea Institute of Oceanology, Chinese Academy of Sciences/Key Laboratory of Tropical Marine Bio-resources and Ecology, Guangzhou 510301, China

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  • Received Date: July 14, 2020
  • Revised Date: August 30, 2020
  • Accepted Date: September 23, 2020
  • Available Online: December 04, 2020
    Graphical Abstract
    • Abstract

  • In order to have a deep and thorough understanding of sediment organic matter in mangrove wetland of the Pearl River Estuary, we analyzed the distribution, stocks and source of soil organic carbon (TOC) and total nitrogen (TN) of the mangrove wetland in Qi'ao Island. The results show that the TOC content in the surficial sediment of seven main mangrove communities (Kandelia candel, Sonneratia opetala, Aegiceras corniculatum, Bruguiera gymnorhiza, Acrostichum aureum, Acanthus ilicifolius, Excoecaria agallocha) was 1.125%−1.969%, and the TN content was 0.058%−0.136%. Among the seven main mangrove communities, K. candel had the highest TOC content of inner forest, while S. opetala had the highest TOC content of forest edge. The lowest TOC contents of inner and edge both appeared in B. gymnorhiza communities. Moreover, the TOC content of inner forest was always higher than that of edge. The C/N of the surficial sediment was 12.032−26.690, showing that higher plants have a higher contribution rate to its organic matter composition. According to the C/N bivariate mixture model, about 70.21% of TOC input came from endogenous input of vegetation. Affected by factors such as land use change, TOC and TN content fluctuated in 0−30 cm soil layer. The storage of organic carbon (SOC) was 56.83−69.54 t·hm−2, showing the strong TOC storage ability of this mangrove wetland in Qi'ao Island.

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