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Ozone mediated changes in methane and nitrous oxide emissions from rice soil

KrishiKosh

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Title Ozone mediated changes in methane and nitrous oxide emissions from rice soil
 
Creator AYAN GHOSH
 
Contributor Arti Bhatia
 
Subject inorganic compounds, carbon, planting, concentrates, yields, rice, developmental stages, grain, biological development, methane
 
Description t-7985
Ozone (O
3
) is a phytotoxic air pollutant produced in the troposphere where
sunlight reacts with VOC’s or oxides of nitrogen emitted by vehicles and industry.
Since the industrial revolution anthropogenic
activity has increased the tropospheric
concentrations of ozone. Tropospheric ozone (O
3
) is a greenhouse gas and its
concentrations are increasing annually by 0.5±2%. Seasonal variations in ozone
concentration ranged from 35 ppb-65 ppb during July to October at IARI, New
Delhi. Surface ozone is known as bad ozone because of its detrimental effect on crop
productivity by decreasing net photosynthesis via oxidative damage to cell
membranes, especially to chloroplasts and consequently reducing dry matter
production. Ozone affects plant productivity and chemistry, which might change
rates of organic C turnover and affect the soil C cycle and N cycle. Thus, it may be
assumed that soil N
2
O and CH
4
fluxes will also be altered. Methane and nitrous
oxide are two important greenhouse gases contributing approximately 19% and 5%
respectively to enhanced greenhouse effects.
Therefore the present investigation was
conducted to assess the impact of surface ozone concentrations on methane and
nitrous oxide emissions from rice soil and to
quantify the effect of increased surface
ozone on growth and yield of rice.
CH
4
and N
2
O emissions were highest in charcoal filtered treatment and lowest
in elevated ozone filtered treatment. Under elevated ozone treatment, cumulative
seasonal CH
4
emissions were reduced by 29% over the non filtered control
treatment while the emissions increased by 21% in the charcoal filtered treatment
over the non filtered control.
The cumulative seasonal N
2
O emissions in the charcoal
filtered treatment were 5% higher than the non filtered control and were 9% lower in
the elevated ozone treatment as compared to
the non-filtered control. Soil organic C
did not change under different treatments
whereas dissolved organic C was the
lowest under elevated ozone. Grain yield was significantly impacted by different
levels of ozone. It reduced by 11.31% under elevated ozone concentration. Filtration
of ozone, which led to sub ambient ozone concentration significantly
(P=0.05)
increased the grain yield and other grow
th parameters as compared to the non
filtered control. The Carbon Efficiency
Ratio (CER) was found to be lowest in
charcoal filtered treatment and highest in elevated ozone treatment.
 
Date 2017-01-11T15:40:55Z
2017-01-11T15:40:55Z
2008
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/95699
 
Format application/pdf