Distinct bacterial-production-DOC-primary-production relationships and implications for biogenic C cycling in the South China Sea shelf

C. C. Lai, Y. W. Fu, H. B. Liu, H. Y. Kuo, K. W. Wang, C. H. Lin, J. H. Tai, G. T.F. Wong, K. Y. Lee, T. Y. Chen, Y. Yamamoto, Ming Fai Chow, Y. Kobayashi, C. Y. Ko, F. K. Shiah

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Based on two summer spatio-temporal data sets obtained from the northern South China Sea shelf and basin, this study reveals contrasting relationships among bacterial production (BP), dissolved organic (DOC) and primary production (PP) in the transition zone from the neritic to the oceanic regions. Inside the mid-shelf (bottom depth <100 m), where inorganic nutrient supplies from river discharge and internal waves were potentially abundant, BP, DOC and PP were positively intercorrelated, whereas these three measurements became uncorrelated in the oligotrophic outer shelf and slope. We suggest that the availability of limiting minerals could affect the couplings/decouplings between the source (i.e. phytoplankton) and sink (i.e. bacteria) of organic carbon, and thus DOC dynamics. DOC turnover times were homogeneously low (37-60 days) inside the mid-shelf area and then increased significantly to values >100 days in the outer shelf, indicating that riverine (Pearl River) DOC might be more labile. The actual mechanism for this is unknown, but might relate to higher inorganic nutrient supply from river/terrestrial sources. The positive correlation of the BP/PP ratios vs. phosphate (and nitrate) concentrations in the inner shelf implies that if anthropogenic mineral loading keeps increasing in the foreseeable future, the near-shore zone may become more heterotrophic, rendering the system a stronger source of CO2.

Original languageEnglish
Pages (from-to)147-156
Number of pages10
JournalBiogeosciences
Volume11
Issue number1
DOIs
Publication statusPublished - 09 Jan 2014

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South China Sea
shelf sea
rendering
organic production
primary production
nitrates
phosphates
basins
minerals
rivers
summer
nutrients
river
transition zone
phosphate
nitrate
nutrient
mineral
basin

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Earth-Surface Processes

Cite this

Lai, C. C. ; Fu, Y. W. ; Liu, H. B. ; Kuo, H. Y. ; Wang, K. W. ; Lin, C. H. ; Tai, J. H. ; Wong, G. T.F. ; Lee, K. Y. ; Chen, T. Y. ; Yamamoto, Y. ; Chow, Ming Fai ; Kobayashi, Y. ; Ko, C. Y. ; Shiah, F. K. / Distinct bacterial-production-DOC-primary-production relationships and implications for biogenic C cycling in the South China Sea shelf. In: Biogeosciences. 2014 ; Vol. 11, No. 1. pp. 147-156.
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abstract = "Based on two summer spatio-temporal data sets obtained from the northern South China Sea shelf and basin, this study reveals contrasting relationships among bacterial production (BP), dissolved organic (DOC) and primary production (PP) in the transition zone from the neritic to the oceanic regions. Inside the mid-shelf (bottom depth <100 m), where inorganic nutrient supplies from river discharge and internal waves were potentially abundant, BP, DOC and PP were positively intercorrelated, whereas these three measurements became uncorrelated in the oligotrophic outer shelf and slope. We suggest that the availability of limiting minerals could affect the couplings/decouplings between the source (i.e. phytoplankton) and sink (i.e. bacteria) of organic carbon, and thus DOC dynamics. DOC turnover times were homogeneously low (37-60 days) inside the mid-shelf area and then increased significantly to values >100 days in the outer shelf, indicating that riverine (Pearl River) DOC might be more labile. The actual mechanism for this is unknown, but might relate to higher inorganic nutrient supply from river/terrestrial sources. The positive correlation of the BP/PP ratios vs. phosphate (and nitrate) concentrations in the inner shelf implies that if anthropogenic mineral loading keeps increasing in the foreseeable future, the near-shore zone may become more heterotrophic, rendering the system a stronger source of CO2.",
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Lai, CC, Fu, YW, Liu, HB, Kuo, HY, Wang, KW, Lin, CH, Tai, JH, Wong, GTF, Lee, KY, Chen, TY, Yamamoto, Y, Chow, MF, Kobayashi, Y, Ko, CY & Shiah, FK 2014, 'Distinct bacterial-production-DOC-primary-production relationships and implications for biogenic C cycling in the South China Sea shelf', Biogeosciences, vol. 11, no. 1, pp. 147-156. https://doi.org/10.5194/bg-11-147-2014

Distinct bacterial-production-DOC-primary-production relationships and implications for biogenic C cycling in the South China Sea shelf. / Lai, C. C.; Fu, Y. W.; Liu, H. B.; Kuo, H. Y.; Wang, K. W.; Lin, C. H.; Tai, J. H.; Wong, G. T.F.; Lee, K. Y.; Chen, T. Y.; Yamamoto, Y.; Chow, Ming Fai; Kobayashi, Y.; Ko, C. Y.; Shiah, F. K.

In: Biogeosciences, Vol. 11, No. 1, 09.01.2014, p. 147-156.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Distinct bacterial-production-DOC-primary-production relationships and implications for biogenic C cycling in the South China Sea shelf

AU - Lai, C. C.

AU - Fu, Y. W.

AU - Liu, H. B.

AU - Kuo, H. Y.

AU - Wang, K. W.

AU - Lin, C. H.

AU - Tai, J. H.

AU - Wong, G. T.F.

AU - Lee, K. Y.

AU - Chen, T. Y.

AU - Yamamoto, Y.

AU - Chow, Ming Fai

AU - Kobayashi, Y.

AU - Ko, C. Y.

AU - Shiah, F. K.

PY - 2014/1/9

Y1 - 2014/1/9

N2 - Based on two summer spatio-temporal data sets obtained from the northern South China Sea shelf and basin, this study reveals contrasting relationships among bacterial production (BP), dissolved organic (DOC) and primary production (PP) in the transition zone from the neritic to the oceanic regions. Inside the mid-shelf (bottom depth <100 m), where inorganic nutrient supplies from river discharge and internal waves were potentially abundant, BP, DOC and PP were positively intercorrelated, whereas these three measurements became uncorrelated in the oligotrophic outer shelf and slope. We suggest that the availability of limiting minerals could affect the couplings/decouplings between the source (i.e. phytoplankton) and sink (i.e. bacteria) of organic carbon, and thus DOC dynamics. DOC turnover times were homogeneously low (37-60 days) inside the mid-shelf area and then increased significantly to values >100 days in the outer shelf, indicating that riverine (Pearl River) DOC might be more labile. The actual mechanism for this is unknown, but might relate to higher inorganic nutrient supply from river/terrestrial sources. The positive correlation of the BP/PP ratios vs. phosphate (and nitrate) concentrations in the inner shelf implies that if anthropogenic mineral loading keeps increasing in the foreseeable future, the near-shore zone may become more heterotrophic, rendering the system a stronger source of CO2.

AB - Based on two summer spatio-temporal data sets obtained from the northern South China Sea shelf and basin, this study reveals contrasting relationships among bacterial production (BP), dissolved organic (DOC) and primary production (PP) in the transition zone from the neritic to the oceanic regions. Inside the mid-shelf (bottom depth <100 m), where inorganic nutrient supplies from river discharge and internal waves were potentially abundant, BP, DOC and PP were positively intercorrelated, whereas these three measurements became uncorrelated in the oligotrophic outer shelf and slope. We suggest that the availability of limiting minerals could affect the couplings/decouplings between the source (i.e. phytoplankton) and sink (i.e. bacteria) of organic carbon, and thus DOC dynamics. DOC turnover times were homogeneously low (37-60 days) inside the mid-shelf area and then increased significantly to values >100 days in the outer shelf, indicating that riverine (Pearl River) DOC might be more labile. The actual mechanism for this is unknown, but might relate to higher inorganic nutrient supply from river/terrestrial sources. The positive correlation of the BP/PP ratios vs. phosphate (and nitrate) concentrations in the inner shelf implies that if anthropogenic mineral loading keeps increasing in the foreseeable future, the near-shore zone may become more heterotrophic, rendering the system a stronger source of CO2.

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