Relative increases in CH4 and CO2 emissions from wetlands under global warming dependent on soil carbon substrates

Nature Geoscience, Journal Year: 2024, Volume and Issue: 17(1), P. 26 - 31

Published: Jan. 1, 2024

Language: Английский

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Effects of soil moisture fluctuation and microplastics types on soil organic matter decomposition and carbon dynamics

Soil Biology and Biochemistry, Journal Year: 2025, Volume and Issue: unknown, P. 109781 - 109781

Published: March 1, 2025

Language: Английский

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Thermal adaptation of microbial respiration persists throughout long‐term soil carbon decomposition

Ecology Letters, Journal Year: 2023, Volume and Issue: 26(10), P. 1803 - 1814

Published: Aug. 17, 2023

Soil microbial respiration is expected to show adaptations changing temperatures, greatly weakening the magnitude of feedback over time, as shown in labile carbon substrates. However, whether such thermal adaptation persists during long-term soil decomposition substrates decrease decomposability remains unknown. Here, we conducted a 6-year incubation experiment natural and arable soils with distinct properties under three temperatures (10, 20 30°C). Mass-specific was consistently lower higher suggesting occurrence persistence decomposition. Furthermore, changes community composition function largely explained respiratory adaptation. If generally occurs large low-decomposability pools, warming-induced losses may be than previously predicted thus not contribute much greenhouse warming.

Language: Английский

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Global patterns of organic carbon transfer and accumulation across the land–ocean continuum constrained by radiocarbon data

Nature Geoscience, Journal Year: 2024, Volume and Issue: 17(8), P. 778 - 786

Published: June 21, 2024

Abstract Radiocarbon (Δ 14 C) serves as an effective tracer for identifying the origin and cycling of carbon in aquatic ecosystems. Global patterns organic (OC) Δ C values riverine particles coastal sediments are essential understanding contemporary cycle, but poorly constrained due to under-sampling. This hinders our OC transfer accumulation across land–ocean continuum worldwide. Here, using machine learning approaches >3,800 observations, we construct a high-spatial resolution global atlas river–ocean continuums show that river corresponding can be similar or different. Specifically, four characteristic modes recognized: old–young mode systems with low high sediment values; young–old old–old old receiving values, respectively; young–young young both deposited particles. Distinguishing these their spatial is critical furthering system. among areas contents worldwide, largely neutral slightly negative atmospheric dioxide (CO 2 ) removal, whereas represent CO sources sinks, respectively. These content isotope composition constrain local potential blue solutions.

Language: Английский

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In Vitro Tungsten Bioaccessibility in Chinese Residential Soils: Implications for Human Health Risk Assessments and Soil Screening Level Derivation

Journal of Hazardous Materials, Journal Year: 2024, Volume and Issue: 477, P. 135368 - 135368

Published: July 28, 2024

Language: Английский

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On the effectiveness of multi-scale landscape metrics in soil organic carbon mapping

Geoderma, Journal Year: 2024, Volume and Issue: 449, P. 117026 - 117026

Published: Sept. 1, 2024

Language: Английский

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Coupling of microbial-explicit model and machine learning improves the prediction and turnover process simulation of soil organic carbon

Climate smart agriculture., Journal Year: 2024, Volume and Issue: 1(1), P. 100001 - 100001

Published: April 24, 2024

Modeling soil organic carbon (SOC) is helpful for understanding its distribution and turnover processes, which can guide the implementation of effective measures (C) sequestration enhance land productivity. Process-based simulation with high interpretability extrapolation, machine learning modeling flexibility are two common methods investigating SOC turnover. To take advantage both methods, we developed a hybrid model by coupling two-carbon pool microbial modeling. Here, assessed model's predictive, mapping, capabilities process on Ningbo region. The results indicate that density-dependence (β ​= ​2) biomass performed better in parameters microbial-based C cycle, such as use efficiency (CUE), mortality rate, assimilation rate. By integrating this optimal random forest (RF) model, improved prediction accuracy SOC, an increased R2 from 0.74 to 0.84, residual deviation 1.97 2.50, reduced root-mean-square error 4.65 3.67 ​g ​kg−1 compared conventional RF model. As result, predicted exhibited spatial variation provided abundant details. Microbial CUE potential input, represented net primary productivity, emerged factors driving Projections under CMIP6 SSP2-4.5 scenario revealed regional loss areas was mainly caused decreased induced climate change. Our findings highlight combining microbial-explicit improve understand feedback changing climate.

Language: Английский

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Biochar Addition Increased Soil Carbon Storage but Did Not Exacerbate Soil Carbon Emission in Young Subtropical Plantation Forest

Forests, Journal Year: 2024, Volume and Issue: 15(6), P. 917 - 917

Published: May 24, 2024

Forests play a crucial role in mitigating global warming, contributing approximately 46% of the terrestrial carbon sink. However, it remains uncertain whether addition biochar to forests enhances ecosystem’s sink capacity. This study aims address this scientific question by investigating application increases storage, potentially leading an overall rise emissions influencing soil respiration and identifying underlying mechanisms. A controlled experiment was conducted young plantation forest that had grown for three years, where CO2 efflux rate physicochemical properties, photosynthesis, plant growth traits were measured across varying rates (0, 5, 10 t/ha) over five seasons. Then, statistical methods including one-way ANOVA, regression analysis, structural equation modeling (SEM) employed assess differences biological abiotic factors among gradients understand mechanisms change. The findings revealed significantly increased contents organic (SOC) microbial biomass (MBC), consequently promoting photosynthesis (p < 0.05). Biochar accounted 73.8% variation affecting basal diameter growth. net effect on found be low. positive effects via such as bulk density, total nitrogen (TN), MBC, counteracted its negative impact through phosphorus (TP), water content, pH, SOC, Overall, our indicate there no significant increase short term (totaling 16 months) gradient. we observed substantial storage enhancement soil’s capacity act Therefore, adding may feasible strategy sinks mitigate climate

Language: Английский

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The Impacts of Erosion on the Carbon Cycle

Reviews of Geophysics, Journal Year: 2025, Volume and Issue: 63(1)

Published: Jan. 2, 2025

Abstract Physical and chemical erosion associated with water both affect land–atmosphere carbon exchanges. However, previous studies have often addressed these processes separately or used oversimplified mechanisms, leading to ongoing debates uncertainties about erosion‐induced fluxes. We provide an overview of the on‐site uptake fluxes induced by physical (0.05–0.29 Pg C yr −1 , globally) (0.26–0.48 ). Then, we discuss off‐site dynamics (during transport, deposition, burial). Soil organic mineralization during transport is nearly 0.37–1.20 on globe. also summarize overall into estuaries (0.71–1.06 ) identify sources different types within them, most which are land erosion. Current approaches for quantifying physical‐erosion‐induced vertical focus two distinct temporal scales: short‐term (ranging from minutes decades), emphasizing net flux, long‐term (spanning millennial geological timescales), examining fate eroded over extended periods. In addition direct measurement modeling approaches, estimation using indicators riverine material popular constraining chemical‐erosion‐driven Lastly, highlight key challenges related To overcome potential biases in future studies, strongly recommend integrated research that addresses a well‐defined timescale. A comprehensive understanding mechanisms driving lateral crucial closing global budget.

Language: Английский

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Soil smoldering in temperate forests: a neglected contributor to fire carbon emissions revealed by atmospheric mixing ratios

Biogeosciences, Journal Year: 2025, Volume and Issue: 22(1), P. 213 - 242

Published: Jan. 13, 2025

Abstract. Fire is regarded as an essential climate variable, emitting greenhouse gases in the combustion process. Current global assessments of fire emissions traditionally rely on coarse remotely sensed burned-area data, along with biome-specific completeness and emission factors (EFs). However, large uncertainties persist regarding burned areas, biomass affected, factors. Recent increases resolution have improved previous estimates areas aboveground while increasing information content used to derive factors, complemented by airborne sensors deployed tropics. To date, temperate forests, characterized a lower incidence stricter aerial surveillance restrictions near wildfires, received less attention. In this study, we leveraged distinctive season 2022, which impacted western European investigate monitored atmospheric tower network. We examined role soil smoldering responsible for higher carbon emissions, locally reported firefighters but not accounted budgets. assessed CO/CO2 ratio released major fires Mediterranean, Atlantic pine, forests France. Our findings revealed low modified efficiency (MCE) two regions, supporting assumption heavy combustion. This type was associated specific characteristics, such long-lasting thermal signals, affected ecosystems encompassing needle leaf species, peatlands, superficial lignite deposits soils. Thanks high-resolution data (approximately 10 m) tree biomass, organic matter (SOM), proposed revised framework consistent observed MCEs. that 6.15 Mt CO2 (±2.65) emitted, belowground stock accounting 51.75 % (±16.05). Additionally, calculated total 1.14 CO (±0.61), 84.85 (±3.75) originating from As result, 2022 France amounted 7.95 MtCO2-eq (±3.62). These values exceed 2-fold Global Assimilation System (GFAS) country, reaching 4.18 (CO CO2). Fires represent 1.97 (±0.89) country's annual footprint, corresponding reduction 30 forest sink year. Consequently, conclude current should be account forests. also recommend use mixing ratios effective monitoring system prolonged potential re-ignite following weeks.

Language: Английский

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