Carbon dioxide emission and its regulation at land–water interface downstream of a point source at Ganga River (India). (17th January 2018)

• Record Type: Journal Article
• Authors: Jaiswal, Deepa; Siddiqui, Ekabal; Verma, Kavita; Pandey, Jitendra
• Is Part Of: Water and environment journal. Volume 32:Number 3(2018)
• Page Start: 351
• Page End: 357
• Publication Date: 2018-01-17
• Subjects: CO2 emission -- Ganga River -- land–water interface -- microbial activity -- nutrient -- point source -- TOC; Sewage -- Periodicals; Water-supply -- Periodicals; Environmental management -- Periodicals; Water-supply engineering -- Periodicals; Pollution -- Periodicals; 628.1
• DOI: 10.1111/wej.12332
• Languages: English
• ISSNs: 1747-6585

Abstract

Abstract: The streams and rivers are considered hotspots of CO2 exchange; and representative direct CO2 emission measurements are essential for a correct regional estimate. We measured CO2 emission flux at 15 sites at land–water interface downstream of a point source during low flow for three consecutive months for the year 2017. The general range of CO2 efflux observed here was close to the results of regional studies, although values near the point source were disproportionately high (>350 mg/m 2 /h). CO2 emission flux showed strong dependence on total organic carbon (TOC; R 2 = 0.96; P < 0.001), NH 4 + ( R 2 = 0.88; P < 0.001), soluble reactive‐P (SRP; R 2 = 0.91; P < 0.001) and microbial activity measured in terms of fluorescein diacetate activity (FDAase; R 2 = 0.92; P < 0.001) and substrate induced respiration (SIR; R 2 = 0.96; P < 0.001). Because point source‐associated interfaces provide heterogeneous habitats, our study suggests the need for large scale monitoring of CO2 emission at land–water interface of major rivers for more correctly presenting the regional scale CO2 budget.