Elevated Atmospheric CO2 Increases Root Exudation of Carbon in Wetlands: Results from the First Free-Air CO2 Enrichment Facility (FACE) in a Marshland

Sánchez-Carrillo, Salvador; Álvarez‐Cobelas, Miguel; Angeler, David G.; Serrano‐Grijalva, Lilia; Sánchez-Andrés, R.; Cirujano, Santos; Schmid, Thomas

doi:10.1007/s10021-017-0189-x

Cited by 18 publications

(7 citation statements)

References 74 publications

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“…Previous studies showed that eCO 2 promoted plant carbon pools in various wetland ecosystems (Liu et al., 2018) because of the increased photosynthetic rates (Lin et al., 2017). On the contrary, warming can cause a decline in plant growth and C accumulation in some natural wetlands (Sánchez‐Carrillo et al., 2018), due to more C allocation to root exudation (Sánchez‐Carrillo et al., 2018), which was not found in the present study. Our study simulated a higher SOM mineralization under eCO 2 , which may be caused by priming effect on SOM decomposition induced by higher root exudates (Ross et al., 2004; Van Groenigen et al., 2014), consistent with field measurements at the SPRUCE site (Hopple et al., 2020; Wilson et al., 2016).…”

Section: Discussioncontrasting

confidence: 76%

An Integrative Model for Soil Biogeochemistry and Methane Processes. II: Warming and Elevated CO₂ Effects on Peatland CH₄ Emissions

et al. 2021

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Section: Discussioncontrasting

confidence: 76%

An Integrative Model for Soil Biogeochemistry and Methane Processes. II: Warming and Elevated CO₂ Effects on Peatland CH₄ Emissions

et al. 2021

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“…In line with our findings, AbdElgawad et al ( 2021) reported that the citrate and phenolic content in the soil were increased under As and eCO 2 conditions compared to the corresponding levels under aCO 2 may be, at least in part, responsible for the reduction in heavy metal accumulation in eCO 2 -treated plants. Similar findings by Phillips et al (2009) and Sanchez-Carrillo et al (2018) demonstrated that eCO 2 treatment increases root exudates of organic acid from plants, perhaps through altering carbon allocation. In addition, organic compounds like phenols and organic acids can serve as ligands for binding metals and as electron carriers transferring electrons with Sb (Campbell and Nordstrom, 2014).…”

Section: Elevated Co 2 Improved Soil Chemical Composition and Healthsupporting

confidence: 69%

Elevated CO2 reduced antimony toxicity in wheat plants by improving photosynthesis, soil microbial content, minerals, and redox status

Khamis,

Reyad,

Alsherif

et al. 2023

Front. Plant Sci.

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IntroductionAntimony (Sb), a common rare heavy metal, is naturally present in soils at low concentrations. However, it is increasingly used in industrial applications, which in turn, leads to an increased release into the environment, exerting a detrimental impact on plant growth. Thus, it is important to study Sb effects on plants under the current and future CO2 (eCO2).MethodsTo this end, high Sb concentrations (1500 mg/kg soil) effects under ambient (420 ppm) and eCO2 (710 ppm) on wheat growth, physiology (photosynthesis reactions) and biochemistry (minerals contents, redox state), were studied and soil microbial were evaluated.Results and discussionOur results showed that Sb uptake significantly decreased wheat growth by 42%. This reduction could be explained by the inhibition in photosynthesis rate, Rubisco activity, and photosynthetic pigments (Cha and Chb), by 35%, 44%, and 51%, respectively. Sb significantly reduced total bacterial and fungal count and increased phenolic and organic acids levels in the soil to decrease Sb uptake. Moreover, it induced oxidative markers, as indicated by the increased levels of H2O2 and MDA (1.96 and 2.8-fold compared to the control condition, respectively). To reduce this damage, antioxidant capacity (TAC), CAT, POX, and SOD enzymes activity were increased by 1.61, 2.2, 2.87, and 1.86-fold, respectively. In contrast, eCO2 mitigated growth inhibition in Sb-treated wheat. eCO2 and Sb coapplication mitigated the Sb harmful effect on growth by reducing Sb uptake and improving photosynthesis and Rubisco enzyme activity by 0.58, 1.57, and 1.4-fold compared to the corresponding Sb treatments, respectively. To reduce Sb uptake and improve mineral availability for plants, a high accumulation of phenolics level and organic acids in the soil was observed. eCO2 reduces Sb-induced oxidative damage by improving redox status. In conclusion, our study has provided valuable insights into the physiological and biochemical bases underlie the Sb-stress mitigating of eCO2 conditions. Furthermore, this is important step to define strategies to prevent its adverse effects of Sb on plants in the future.

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“…In temperate peatlands, vegetation cover has been shown to also have a significant impact on the temperature sensitivity of GHG production (Leroy et al 2017). Increasing atmospheric CO 2 has been found to increase rates of root exudation in wetland ecosystems (Sánchez-Carrillo et al 2018) and increases in temperature have also been reported to enhance rates of root exudation in some tree species (Uselman et al 2000), and alter the composition of exudate profiles (Badri and Vivanco 2009;Vančura 1967), both known to be critical regulators of GHG emissions and peat properties (Girkin et al 2018a, b). As a consequence, the true response of in situ net emissions of GHGs will comprise components driven by both the temperature sensitivity of the peat itself, and any changes in root inputs.…”

Section: Discussionmentioning

confidence: 99%

Interactions between labile carbon, temperature and land use regulate carbon dioxide and methane production in tropical peat

et al. 2019

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Tropical peatlands are a significant carbon store and contribute to global carbon dioxide (CO 2) and methane (CH 4) emissions. Tropical peatlands are threatened by both land use and climate change, including the alteration of regional precipitation patterns, and the 3-4°C predicted warming by 2100. Plant communities in tropical peatlands can regulate greenhouse gas (GHG) fluxes through labile carbon inputs, but the extent to which these inputs regulate the temperature response of CO 2 and CH 4 production in tropical peat remains unclear. We conducted an anoxic incubation experiment using three peat types of contrasting botanical origin to assess how carbon addition affects the temperature response (Q 10) of CO 2 and CH 4 production. Peats from forested peatlands in Panama and Malaysia, and a converted oil palm and pineapple intercropping system in Malaysia, differed significantly in redox potential, total carbon and carbon: nitrogen ratio. The production of CO 2 and CH 4 varied significantly among peat types and increased with increasing temperature, with Q 10 s for both gases of 1.4. Carbon addition further increased gas fluxes, but did not influence the Q 10 for CO 2 or CH 4 production or significantly affect the Q 10 of either gas. These findings demonstrate that the production of CO 2 and CH 4 in tropical peat is sensitive to warming and varies among peat types, but that the effect of root inputs in altering Q 10 appears to be limited. Keywords Tropical peat Á Carbon dioxide Á Methane Á Root exudates Á Land use change Á Temperature sensitivity

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Elevated Atmospheric CO2 Increases Root Exudation of Carbon in Wetlands: Results from the First Free-Air CO2 Enrichment Facility (FACE) in a Marshland

Cited by 18 publications

References 74 publications

An Integrative Model for Soil Biogeochemistry and Methane Processes. II: Warming and Elevated CO₂ Effects on Peatland CH₄ Emissions

An Integrative Model for Soil Biogeochemistry and Methane Processes. II: Warming and Elevated CO₂ Effects on Peatland CH₄ Emissions

Elevated CO2 reduced antimony toxicity in wheat plants by improving photosynthesis, soil microbial content, minerals, and redox status

Interactions between labile carbon, temperature and land use regulate carbon dioxide and methane production in tropical peat

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Elevated Atmospheric CO2 Increases Root Exudation of Carbon in Wetlands: Results from the First Free-Air CO2 Enrichment Facility (FACE) in a Marshland

Cited by 18 publications

References 74 publications

An Integrative Model for Soil Biogeochemistry and Methane Processes. II: Warming and Elevated CO2 Effects on Peatland CH4 Emissions

An Integrative Model for Soil Biogeochemistry and Methane Processes. II: Warming and Elevated CO2 Effects on Peatland CH4 Emissions

Elevated CO2 reduced antimony toxicity in wheat plants by improving photosynthesis, soil microbial content, minerals, and redox status

Interactions between labile carbon, temperature and land use regulate carbon dioxide and methane production in tropical peat

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An Integrative Model for Soil Biogeochemistry and Methane Processes. II: Warming and Elevated CO₂ Effects on Peatland CH₄ Emissions

An Integrative Model for Soil Biogeochemistry and Methane Processes. II: Warming and Elevated CO₂ Effects on Peatland CH₄ Emissions