Major Nutrients and Their Stoichiometry over 45 Years (May 1963-May 2008) at the Northern and Southern Basin of Lake Biwa, Japan

Asheesh Shrivastava^{1, 2,}

¹National Environmental Engineering Research Institute (CSIR), Mumbai Zonal Lab, Mumbai, India

²Graduate School of Human and Environmental Studies, Kyoto University, Kyoto, Japan

Cite this paper:
Asheesh Shrivastava. Major Nutrients and Their Stoichiometry over 45 Years (May 1963-May 2008) at the Northern and Southern Basin of Lake Biwa, Japan. World Journal of Environmental Engineering. 2014; 2(1):6-11. doi: 10.12691/wjee-2-1-2

Abstract

On the basis of the chemical components found in Lake Biwa, Japan from May 1963 to May 2008, the vertical variation (0~70 m depth) of total phosphorus (TP) and total nitrogen (TN) concentrations in the Northern Basin (Ie-1) were evaluated. Similarly, TP and TN concentrations were also discussed at the surface of the Southern basin (Nb-5). It was concluded that the second stage nutrient concentrations had decreased compared to Northern basin due to increased macrophyte growth, improvement in inflow river waters and implementation of laws. The long term variations in the TN/TP ratios were also discussed in relation to propagation of plankton. The lower TN/TP ratios observed in the Northern and Southern Basins waters were well coincident with the more frequent and denser propagation of N₂-fixing cyanobacteria. Recently, the TN/TP ratios have shown a tendency of increase in Southern Basin suggesting a first sign for the restoration of water.

Keywords:
lake biwa total phosphorus total nitrogen vertical distribution long term trends

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