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.
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Subject |
Climate change feedback, Elevated CO2 and temperature, Microbial carbon fixation, Photosynthesis, Root exudates, Rice
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Description |
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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 |
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Date |
2021-01-01T10:52:17Z
2021-01-01T10:52:17Z 2020-05-08 |
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Type |
Research Paper
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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.
Not Available http://krishi.icar.gov.in/jspui/handle/123456789/44382 |
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Language |
English
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Relation |
Not Available;
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Publisher |
Elsevier
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