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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
environmental science
Controls of DSi in streams and reservoirs along the Kaveri River, South India
Science of the Total Environment, Volume 502, Year 2015
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Description
There is an increasing body of evidence showing that land use may affect the concentration and flux of dissolved silica (DSi) and amorphous, biogenic Si particles (ASi/BSi) in surface waters. Here, we present a study of riverine waters collected within the Kaveri River Basin, which has a long history of land occupation with +43% population increase in the watershed during the last 30years associated with agricultural practices including canal irrigation from reservoirs and, more recently, bore well pumping. We report total dissolved solids (TDS) and suspended material (TSM) for 15 river stations and 5 reservoirs along the Kaveri itself and its main tributaries sampled during pre-monsoon, monsoon and post-monsoon periods in 2006 and 2007. The TDS in the Kaveri River globally increases from the upper reaches (humid to sub-humid climate) to the lower reaches (semi-arid climate), and at a given station from monsoon (M) to hot season (HS). The DSi concentrations range from 129μmolL-1 (M) to 390μmolL-1 (HS) in the main Kaveri stream and reaches up to 686μmolL-1 in the Shimsha River (HS). Our results indicate that DSi and the main solutes of the Kaveri River have not drastically changed since the last 30years despite the population increase. The pollution index of Van der Weijden and Pacheco (2006) ranges from 13% to 54% but DSi does not seem to be affected by domestic wastewater. ASi is mostly composed of diatoms and phytoliths that both play roles in controlling DSi. We suggest that DSi and ASi delivered to the cultivated areas through irrigation from reservoir may have two important consequences: increasing Si bioavailability for crops and limiting Si flux to the ocean. © 2014 Elsevier B.V.
Authors & Co-Authors
Meunier, Jean Dominique
France, Aix-en-provence
Centre Européen de Recherche et D’enseignement de Géosciences de L’environnement
Riotte, Jean
France, Toulouse
Observatoire Midi-pyrénées
India, Bengaluru
Indo French Cell for Water Sciences
Braun, Jean Jacques
France, Toulouse
Observatoire Midi-pyrénées
India, Bengaluru
Indo French Cell for Water Sciences
Sekhar, Muddu Chandra
India, Bengaluru
Indo French Cell for Water Sciences
India, Bengaluru
Indian Institute of Science
Chalié, Françoise
France, Aix-en-provence
Centre Européen de Recherche et D’enseignement de Géosciences de L’environnement
Barboni, Doris
France, Aix-en-provence
Centre Européen de Recherche et D’enseignement de Géosciences de L’environnement
Statistics
Citations: 15
Authors: 6
Affiliations: 5
Identifiers
Doi:
10.1016/j.scitotenv.2014.07.107
ISSN:
00489697
Research Areas
Environmental
Study Design
Cross Sectional Study