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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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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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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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Journal Article
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
2008
Overview
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 x 10³ mol km⁻² year⁻¹ or 185 kg km⁻² year⁻¹), the N yield was relatively low (10 x 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.
Publisher
Dordrecht : Springer Netherlands,Springer,Springer Netherlands,Springer Nature B.V
Subject
/ Animal, plant and microbial ecology
/ Biological and medical sciences
/ Brackish
/ carbon
/ Earth and Environmental Science
/ Exact sciences and technology
/ Fundamental and applied biological sciences. Psychology
/ Geology
/ India
/ Isotope geochemistry. Geochronology
/ Isotopes
/ Land use
/ Nitrates
/ Nitrogen
/ Rivers
/ rocks
/ Soils
/ Suspended particulate matter
/ tropics
