Organic carbon transport and C/N ratio variations in a large tropical river

Godavari as a case study, India

K. Balakrishna, J. L. Probst

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

This study gives an insight into the source of organic carbon and nitrogen in the Godavari river and its tributaries, the yield of organic carbon from the catchment, seasonal variability in their concentration and the ultimate flux of organic and inorganic carbon into the Bay of Bengal. Particulate organic carbon/particulate organic nitrogen (POC/PON or C/N) ratios revealed that the dominant source of organic matter in the high season is from the soil (C/N = 8-14), while in the rest of the seasons, the river-derived (in situ) phytoplankton is the major source (C/N = l-8). Amount of organic materials carried from the lower catchment and flood plains to the oceans during the high season are 3 to 91 times higher than in the moderate and low seasons. Large-scale erosion and deforestation in the catchment has led to higher net yield of organic carbon in the Godavari catchment when compared to other major world rivers. The total flux of POC, and dissolved inorganic carbon (DIC) from the Godavari river to the Bay of Bengal is estimated as 756 × 10 9 and 2520 × 109 g yr-1, respectively. About 22% of POC is lost in the main channel because of oxidation of labile organic matter, entrapment of organic material behind dams/sedimentation along flood plains and river channel; the DIC fluxes as a function of alkalinity are conservative throughout the river channel. Finally, the C/N ratios (∼12) of the ultimate fluxes of particulate organic carbon suggest the dominance of refractory/stable soil organic matter that could eventually get buried in the coastal sediments on a geological time scale.

Original languageEnglish
Pages (from-to)457-473
Number of pages17
JournalBiogeochemistry
Volume73
Issue number3
DOIs
Publication statusPublished - 01-04-2005

Fingerprint

Organic carbon
Rivers
organic carbon
catchment
Catchments
dissolved inorganic carbon
particulate organic carbon
river channel
river
Biological materials
Fluxes
Carbon
particulate organic nitrogen
organic matter
geological time
coastal sediment
inorganic carbon
Nitrogen
carbon flux
organic nitrogen

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Water Science and Technology
  • Earth-Surface Processes

Cite this

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abstract = "This study gives an insight into the source of organic carbon and nitrogen in the Godavari river and its tributaries, the yield of organic carbon from the catchment, seasonal variability in their concentration and the ultimate flux of organic and inorganic carbon into the Bay of Bengal. Particulate organic carbon/particulate organic nitrogen (POC/PON or C/N) ratios revealed that the dominant source of organic matter in the high season is from the soil (C/N = 8-14), while in the rest of the seasons, the river-derived (in situ) phytoplankton is the major source (C/N = l-8). Amount of organic materials carried from the lower catchment and flood plains to the oceans during the high season are 3 to 91 times higher than in the moderate and low seasons. Large-scale erosion and deforestation in the catchment has led to higher net yield of organic carbon in the Godavari catchment when compared to other major world rivers. The total flux of POC, and dissolved inorganic carbon (DIC) from the Godavari river to the Bay of Bengal is estimated as 756 × 10 9 and 2520 × 109 g yr-1, respectively. About 22{\%} of POC is lost in the main channel because of oxidation of labile organic matter, entrapment of organic material behind dams/sedimentation along flood plains and river channel; the DIC fluxes as a function of alkalinity are conservative throughout the river channel. Finally, the C/N ratios (∼12) of the ultimate fluxes of particulate organic carbon suggest the dominance of refractory/stable soil organic matter that could eventually get buried in the coastal sediments on a geological time scale.",
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Organic carbon transport and C/N ratio variations in a large tropical river : Godavari as a case study, India. / Balakrishna, K.; Probst, J. L.

In: Biogeochemistry, Vol. 73, No. 3, 01.04.2005, p. 457-473.

Research output: Contribution to journalArticle

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