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Effect of land use on the biogeochemistry of dissolved nutrients and suspended and sedimentary organic matter in the tropical Kallada River and Ashtamudi estuary, Kerala, India

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Abstract

The effect of land use on the biogeochemistry of small tropical rivers and their estuaries was studied using the Kallada River and Ashtamudi estuary located in the State of Kerala, India, as a model system. Water, suspended matter and sediments collected during the monsoon and intermonsoon periods in 2002 and 2003 were analyzed for dissolved nutrients (nitrate, nitrite, phosphate, silicate) and for phytoplankton abundance and composition, amino acid contents and stable carbon (C)) and nitrogen (N) isotope ratios. Seasonal and spatial variations of dissolved nutrients and suspended matter along the course of the river point to distinct differences in the C and N sources that are controlled by hydrology, geology and land use. Unusually low concentrations of dissolved silicate and suspended matter suggest low erosion rates of the Precambrian basement rocks and the firm lateritic soils in non-agricultural areas. Most dissolved nutrients and suspended particulate organic matter originated from fertilized agricultural soils. The biogeochemistry of sedimentary organic matter indicates that most of the Kallada River load is deposited in the upper Ashtamudi estuary, while the middle and lower parts have a stronger marine influence. The spatio-temporal variation of dissolved and particulate river fluxes clearly indicates an effect of land use and land cover on the biogeochemistry of the Kallada River. While the phosphate yield was high (6 × 103 mol km−2 year−1 or 185 kg km−2 year−1), the N yield was relatively low (10 × 103 mol km−2 year−1 or 141 kg km−2 year−1), which is unlike the situation in many other densely populated regions of tropical Asia.

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Acknowledgments

We thank Dr. P.P. Ouseph, Dr. Mahamaya Chattopadhyay and L. Thushara for help during the course of the study, Susann Henkel for helpful comments and Dorothee Dasbach, Matthias Birkicht and Arno Cremer for laboratory work. We appreciate the constructive comments of Anne E. Hershey and William B. Bowden, which helped to improve the quality of the paper. Financial support by the International Bureau of the German Federal Ministry of Education and Research (Grant No. IND 03/021) and the Kerala State Council on Science, Technology and Environment (Project “Terrestrial nutrients loads and coastal productivity: a case study in South Kerala”) is gratefully acknowledged.

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Authors and Affiliations

  1. Leibniz Zentrum für Marine Tropenökologie, Fahrenheitstrasse 6, 28359, Bremen, Germany

    T. C. Jennerjahn, V. Ittekkot & I. Nordhaus

  2. Centre for Earth Science Studies, Akkulam, Thiruvananthapuram, India

    K. Soman, S. Sooraj & R. S. Priya

  3. Institut für Biogeochemie und Meereschemie, Universität Hamburg, Bundesstrasse 55, 20146, Hamburg, Germany

    N. Lahajnar

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  1. T. C. Jennerjahn
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  2. K. Soman
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Jennerjahn, T.C., Soman, K., Ittekkot, V. et al. Effect of land use on the biogeochemistry of dissolved nutrients and suspended and sedimentary organic matter in the tropical Kallada River and Ashtamudi estuary, Kerala, India. Biogeochemistry 90, 29–47 (2008). https://doi.org/10.1007/s10533-008-9228-1

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