Carbon dioxide emission and its regulation at land-water interface downstream of a point source at Ganga River (India)

2018 ◽  
Vol 32 (3) ◽  
pp. 351-357 ◽  
Author(s):  
Deepa Jaiswal ◽  
Ekabal Siddiqui ◽  
Kavita Verma ◽  
Jitendra Pandey
Keyword(s):  
Carbon Dioxide ◽  
Point Source ◽  
Carbon Dioxide Emission ◽  
Ganga River ◽  
Water Interface ◽  
Land Water

scholarly journals Collateral implications of carbon and metal pollution on carbon dioxide emission at land-water interface of the Ganga River

2021 ◽  
Author(s):  
Kavita Verma ◽  
Jitendra Pandey
Keyword(s):  
Organic Matter ◽  
Microbial Degradation ◽  
Metal Pollution ◽  
River Sediments ◽  
Phenol Oxidase ◽  
Main Stem ◽  
Ganga River ◽  
Water Interface ◽  
Main River ◽  
Land Water

Abstract Atmospheric CO2- source- and- sink is among the most debated issues that have puzzled climate change geochemist for decades. Here, we tested whether heavy metal pollutants in river sediments favor preservation of organic matter through shielding microbial degradation. We measured CO2 emission and extracellular enzyme activities at land-water interface (LWI) of 7 sites along a 285 km main stem of the Ganga River and 60 locations up- and downstream of two contrasting point sources discharging urban (Assi drain; Asdr) and industrial (Ramnagar drain; Rmdr) wastewaters to the river. We found the lowest CO2 flux at Rmdr mouth characterized by the highest concentrations of Cu, Cr, Zn, Pb, Ni, and Cd. The fluxes were relatively higher at locations up-and down-stream Rmdr. Substrate induced respiration (SIR), protease, FDAase and β-D-glucosidase all showed a similar trend but phenol oxidase and alkaline phosphatase showed opposite trend at the main river stem and Asdr. Sites rich in terrestrially derived organic matter have high phenol oxidase activity with low CO2 emission. The CO2 emission in the main river stem showed curvilinear relationships with total heavy metals (∑THM; R2 = 0.68; P < 0.001) and TOC (R2 = 0.65; p < 0.001). The dynamic fit model of main stem data showed that the ∑THM above 337.4 µg g− 1 were able to significantly decrease the activities of protease, FDAase and β-D-glucosidase. The study has implications for understanding C-cycling in human-impacted river sediments where metal pollution shields microbial degradation consequently carbon and nutrient release; and merits attention towards river management decisions.

Causal study of macroeconomic indicators on carbon dioxide emission in ASEAN 5

2017 ◽  
pp. 15-31
Author(s):  
Adhitya Wardhono ◽  
Panji Tirta Nirwana Putra ◽  
M. Abd. Nasir
Keyword(s):  
Carbon Dioxide ◽  
Carbon Dioxide Emission ◽  
Macroeconomic Indicators

An Analysis of Determinant Factors on Carbon Dioxide Emission in Japanese Regions Using Regional Input-Output Model

2003 ◽  
Vol 34 (1) ◽  
pp. 1-22
Author(s):  
Hirofumi ABE ◽  
Mamoru TANIGUCHI ◽  
Takuya NAGARE ◽  
Tomonori SHINKE
Keyword(s):  
Carbon Dioxide ◽  
Carbon Dioxide Emission ◽  
Input Output ◽  
Determinant Factors ◽  
Japanese Regions
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