Manipulation of soil methane oxidation under drought stress

Zhou, Xiaoqi; Smaill, Simeon J.; Gu, Xinyun; Clinton, Peter W.

doi:10.1016/j.scitotenv.2020.144089

Cited by 15 publications

(2 citation statements)

References 37 publications

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“…Generally, soil water content (SWC) has a unimodal relationship with soil CH 4 uptake rate 29 , 30 . Under low soil moisture, water stress can promote ethylene production by plants, which inhibits CH 4 oxidation in soil 30 , 31 . In addition, water stress on methanotrophs can result in reducing their activity 29 .…”

Section: Resultsmentioning

confidence: 99%

Soil organic carbon is a key determinant of CH4 sink in global forest soils

Lee

et al. 2023

Nat Commun

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Soil organic carbon (SOC) is a primary regulator of the forest–climate feedback. However, its indicative capability for the soil CH4 sink is poorly understood due to the incomplete knowledge of the underlying mechanisms. Therefore, SOC is not explicitly included in the current model estimation of the global forest CH4 sink. Here, using in-situ observations, global meta-analysis, and process-based modeling, we provide evidence that SOC constitutes an important variable that governs the forest CH4 sink. We find that a CH4 sink is enhanced with increasing SOC content on regional and global scales. The revised model with SOC function better reproduces the field observation and estimates a 39% larger global forest CH4 sink (24.27 Tg CH4 yr−1) than the model without considering SOC effects (17.46 Tg CH4 yr−1). This study highlights the role of SOC in the forest CH4 sink, which shall be factored into future global CH4 budget quantification.

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Section: Resultsmentioning

confidence: 99%

Soil organic carbon is a key determinant of CH4 sink in global forest soils

Lee

et al. 2023

Nat Commun

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“…The interplay of drought and soil desiccation cracking can significantly impact CH 4 emissions from soil to the atmosphere. Several studies have observed decreased CH 4 emissions from soils during drought periods [23]. This phenomenon has been attributed to the combined effects of reduced microbial activity in aerobic conditions and increased methane oxidation.…”

Section: Effects On the Emissions Of Other Ghgsmentioning

confidence: 99%

Amplifying feedback loop between drought, soil desiccation cracking, and greenhouse gas emissions

Vahedifard,

Goodman,

Paul

et al. 2024

Environ. Res. Lett.

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Approximately two-thirds of the energy imbalance responsible for the rise in global temperatures can be attributed to the increase of carbon dioxide (CO2) released into the atmosphere (1). While the primary anthropogenic source of increased atmospheric CO2 concentration is the combustion of fossil fuels, the largest terrestrial source of CO2 emissions is soil (2) where 80% of the total terrestrial carbon is stored. Approximately 62% of soil carbon is in organic form and readily released as CO2, while the remaining is made up of inorganic carbon (SIC) (3). Here, we postulate that there is an amplifying feedback loop between drought, soil desiccation cracking, and CO2 emission in a warming climate (Fig. 1) – a critical aspect that has been overlooked in the existing literature. Further, we argue that the postulated feedback loop affects the emissions of other greenhouse gases (GHGs), such as methane (CH4) and nitrous oxide (N2O), from soils. The urgent need to recognize and characterize this exacerbating feedback loop is twofold. Firstly, it is widely acknowledged that drought accelerates the oxidation of SOC and, thus, increases CO2 emissions into the atmosphere. Drought-induced soil moisture deficits cause plants to reduce their rates of photosynthesis and respiration, resulting in reduced carbon uptake and increased carbon emissions from the soil. Secondly, drought triggers soil desiccation cracking, substantially increasing the permeability of the soil and the interfacial exchange area between the atmosphere and the soil, which, in turn, can considerably increase CO2 efflux in soil by exposing deeper and older stores of soil carbon. Desiccation cracking threatens earthen infrastructure systems and the natural environment. The problems associated with desiccation cracks are becoming more prevalent as anthropogenic climate change exacerbates the severity and frequency of droughts, heatwaves, and drought-heavy precipitation cycles (4). As the warming trends continue, more (and possibly older) CO2 is released from the soil, which can further contribute to global warming. Thus, a chain of events happens in a cascading manner. Failure to consider the hypothesized feedback loop can result in significant inaccuracies when modeling and predicting GHG emissions from soil. It may also lead to underestimating the overall impact of climate change on critical aspects such as soil health, crop production, and the structural integrity of earthen infrastructure.

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Biochar application in remediating salt-affected soil to achieve carbon neutrality and abate climate change

Liu

Meki

Yuan

et al. 2023

Biochar

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Salt-affected soils urgently need to be remediated to achieve the goals of carbon neutrality and food security. Limited reviews are available on biochar performance in remediating salt-affected soils in the context of carbon neutrality and climate change mitigation. This work summarized the two pathways to achieve carbon neutrality during remediating salt-affected soils using biochars, i.e., biochar production from sustainable feedstock using thermal technologies, application for promoting plant productivity and mitigating greenhouse gas (GHG) emission. Converting biomass wastes into biochars can reduce GHG emission and promote carbon dioxide removal (CDR), and collection of halophyte biomass as biochar feedstocks, development of biochar poly-generation production systems with carbon neutrality or negativity could be promising strategies. Biochar can effectively improve plant growth in salt-affected soils, showing that the grand mean of plant productivity response was 29.3%, via improving physicochemical characteristics, shifting microbial communities, and enhancing plant halotolerance. Moreover, biochar can mitigate GHG emission via inducing negative priming effect, improving soil properties, changing microbial communities associated with carbon and nitrogen cycle, direct adsorption of GHG. However, biochar also may pose negative effects on plant growth because of stress of toxic compounds and free radicals, and deterioration of soil properties. The promoted GHG emission is mainly ascribed to positive priming effect, and provision of labile carbon and inorganic nitrogen fractions as microbial substrates. Finally, this review pointed out the gaps in the current studies and the future perspectives. Particularly, the development of “carbon neutral” or “carbon negative” biochar production system, balancing the relationship of biochar effectiveness and functionality with its environmental risks and costs, and designing biochar-based GHG adsorbents would be important directions for remediating salt-affected soils to achieve carbon neutrality and abate climate change. Graphical Abstract

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Manipulation of soil methane oxidation under drought stress

Cited by 15 publications

References 37 publications

Soil organic carbon is a key determinant of CH4 sink in global forest soils

Soil organic carbon is a key determinant of CH4 sink in global forest soils

Amplifying feedback loop between drought, soil desiccation cracking, and greenhouse gas emissions

Biochar application in remediating salt-affected soil to achieve carbon neutrality and abate climate change

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