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Enhanced labile carbon flow in soil-microbes-plant-atmospheric continuum in rice under elevated CO2 and temperature leads to positive climate change feed-back

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Title Enhanced labile carbon flow in soil-microbes-plant-atmospheric continuum in rice under elevated CO2 and temperature leads to positive climate change feed-back
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Creator Padhy, S.R., Bhattacharyya, P., Dash, P.K., Roy, K.S., Neogi, S., Baig, M.J., Swain, P., Nayak, A.K. and Mahapatra, T.
 
Subject Climate change feedback, Elevated CO2 and temperature, Microbial carbon fixation, Photosynthesis, Root exudates, Rice
 
Description Not Available
Lowland rice along with wetland sequesters one third of terrestrial carbon (C) which is responsible for both positive and negative feed-back to climate change. Labile C pools are sensitive to anticipated climate change condition (elevated CO2 and temperature). Those may eventually affect the C-stock in soil-microbes-plant-atmospheric (SMPA) continuum through priming effect and could enhance positive climate change feedback. Therefore, the objectives of the study were to analysis the effect elevated CO2 on C partitioning in rice-plant parts, soil labile C pools, and methane emission; along with identify related bacterial diversities and C-fixation pathways through whole genome metagenomic approach. The labile carbon flow in SMPA continuum was estimated for 3 years in lowland rice under elevated CO2 and temperature in open top chambers (OTCs). Rice was grown under ambient CO2 (a-CO2; 390 ± 20 μmol mol-1) and elevated CO2 and temperature (e-CO2T; 550 ± 20 μmol mol-1; 2 °C above ambient) under OTCs with replications. Soil labile C pools were increased by 25.4 to 38.9%, under e-CO2T over a-CO2. In microbes, biomass C, C-fixation pathways (metagenomic analysis) and C related soil enzymes were assayed. In atmosphere, the methane emission was measured and in plant system, C in different plant- parts, photosynthetic rates, root exudates-C were estimated to quantify labile C flow. Root exudates C was increased by 31.9% and microbial biomass C was enhanced by 23.3% under e-CO2T. Primarily, 12 soil bacterial genera which were responsible for C-fixation were dominant with higher abundance reads under e-CO2T. In C-fixation, dicarboxylate hydroxybutyrate cycle pathway and reductive citric acid cycle pathway were predominant under a-CO2 and e-CO2T, respectively. The methane emission was 26.0 and 26.8% higher under e-CO2T than a-CO2 at vegetative and reproductive stage of crop, respectively. Further, we got higher biomass accumulation, photosynthetic rate and stomatal conductance of rice under e-CO2T. Therefore, these augmented labile C flows in SMPA continuum may trigger the priming of soil C stocks, and at the same time could affect the system as a whole and results a positive feedback to climate change.
ICAR
 
Date 2021-01-01T10:52:17Z
2021-01-01T10:52:17Z
2020-05-08
 
Type Research Paper
 
Identifier Padhy, S.R., Bhattacharyya, P., Dash, P.K., Roy, K.S., Neogi, S., Baig, M.J., Swain, P., Nayak, A.K. and Mahapatra, T., 2020. Enhanced labile carbon flow in soil-microbes-plant-atmospheric continuum in rice under elevated CO2 and temperature leads to positive climate change feed-back. Applied Soil Ecology, 155, p.103657.
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http://krishi.icar.gov.in/jspui/handle/123456789/44382
 
Language English
 
Relation Not Available;
 
Publisher Elsevier