Labile Organic Carbon Fractions, Regulator of CO<sub>2</sub> Emission: Effect of Plant Residues and Water Regimes

Hassan, Waseem; Bashir, Safdar; Ahmed, Niaz; Tanveer, Mohsin; Shah, Adnan Noor; Bano, Rizwana; David, Julie

doi:10.1002/clen.201400405

Cited by 13 publications

(7 citation statements)

References 53 publications

(69 reference statements)

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“…Similar correlations have also been recorded in some previous studies when plant materials were incorporated into the soil [11,55,58]. This is because, in addition to N, crop residue incorporation increases available organic C, which stimulates soil heterotrophic respiration and the oxidation of labile organic C fractions to CO2, lowering oxygen pressures in soils and creating anaerobic conditions favorable for denitrifiers [59,60].…”

Section: Crop Residue and Fertilizer Effect On Soil N Dynamics And N2...supporting

confidence: 85%

Cereal-Legume Mixed Residue Addition Increases Yield and Reduces Soil Greenhouse Gas Emissions from Fertilized Winter Wheat in the North China Plain

Raseduzzaman,

Gaudel,

Ali

et al. 2024

Agronomy

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Incorporating crop residues into the soil is an effective method for improving soil carbon sequestration, fertility, and crop productivity. Such potential benefits, however, may be offset if residue addition leads to a substantial increase in soil greenhouse gas (GHG) emissions. This study aimed to quantify the effect of different crop residues with varying C/N ratios and different nitrogen (N) fertilizers on GHG emissions, yield, and yield-scaled emissions (GHGI) in winter wheat. The field experiment was conducted during the 2018–2019 winter wheat season, comprising of four residue treatments (no residue, maize residue, soybean residue, and maize-soybean mixed residue) and four fertilizer treatments (control, urea, manure, and manure + urea). The experiment followed a randomized split-plot design, with N treatments as the main plot factor and crop residue treatments as the sub-plot factor. Except for the control, all N treatments received 150 kg N ha−1 season−1. The results showed that soils from all treatments acted as a net source of N2O and CO2 fluxes but as a net sink of CH4 fluxes. Soybean residue significantly increased soil N2O emissions, while mixed residue had the lowest N2O emissions among the three residues. However, all residue amendments significantly increased soil CO2 emissions. Furthermore, soybean and mixed residues significantly increased grain yield by 24% and 21%, respectively, compared to no residue amendment. Both soybean and mixed residues reduced GHGI by 25% compared to maize residue. Additionally, the urea and manure + urea treatments exhibited higher N2O emissions among the N treatments, but they contributed to significantly higher grain yields and resulted in lower GHGI. Moreover, crop residue incorporation significantly altered soil N dynamics. In soybean residue-amended soil, both NH4+ and NO3− concentrations were significantly higher (p < 0.05). Conversely, soil NO3− content was notably lower in the maize-soybean mixed residue amendment. Overall, our findings contribute to a comprehensive understanding of how different residue additions from different cropping systems influence soil N dynamics and GHG emissions, offering valuable insights into effective agroecosystems management for long-term food security and soil sustainability while mitigating GHG emissions.

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Section: Crop Residue and Fertilizer Effect On Soil N Dynamics And N2...supporting

confidence: 85%

Cereal-Legume Mixed Residue Addition Increases Yield and Reduces Soil Greenhouse Gas Emissions from Fertilized Winter Wheat in the North China Plain

Raseduzzaman,

Gaudel,

Ali

et al. 2024

Agronomy

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“…Therefore, DOC can be regulated and limited by microbes to some extent. LFOC is primarily related to land use, plant coverage 61 , 62 , microbial activities 63 and C mineralization 64 . XRCW, with significantly higher plant coverage and species and microbial diversity than XR, whereas XRCW has similar level of LFOC with XR.…”

Section: Discussionmentioning

confidence: 99%

Factors affecting distribution patterns of organic carbon in sediments at regional and national scales in China

Cao

Wang

Zhang

et al. 2017

Sci Rep

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Wetlands are an important carbon reservoir pool in terrestrial ecosystems. Light fraction organic carbon (LFOC), heavy fraction organic carbon (HFOC), and dissolved organic carbon (DOC) were fractionated in sediment samples from the four wetlands (ZR: Zhaoniu River; ZRCW: Zhaoniu River Constructed Wetland; XR: Xinxue River; XRCW: Xinxue River Constructed Wetland). Organic carbon (OC) from rivers and coasts of China were retrieved and statistically analyzed. At regional scale, HFOC stably dominates the deposition of OC (95.4%), whereas DOC and LFOC in ZR is significantly higher than in ZRCW. Concentration of DOC is significantly higher in XRCW (30.37 mg/l) than that in XR (13.59 mg/l). DOC and HFOC notably distinguish between two sampling campaigns, and the deposition of carbon fractions are limited by low nitrogen input. At the national scale, OC attains the maximum of 2.29% at precipitation of 800 mm. OC has no significant difference among the three climate zones but significantly higher in river sediments than in coasts. Coastal OC increases from Bohai Sea (0.52%) to South Sea (0.70%) with a decrease in latitude. This study summarizes the factors affecting organic carbon storage in regional and national scale, and have constructive implications for carbon assessment, modelling, and management.

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“…However when carefully considering these papers (Janzen et al, 1992;Hassink, 1995;Campbell et al, 1999a;Campbell et al, 1999b;Wander and Bidart, 2000) and others (Liang et al, 2003;Hassan et al, 2016;Li et al, 2016), it emerged that the presented data were not normalized by the total SOC concentration of the samples. Without normalization it could be argued that the positive correlation between the POM-C and the respired-C fractions was in fact driven by variations in total SOC concentration and not SOC biogeochemical stability.…”

Section: Relationships Between Respiration Test and Pom Fractionationmentioning

confidence: 99%

Is Rock-Eval 6 thermal analysis a good indicator of soil organic carbon lability? – A method-comparison study in forest soils

Soucémarianadin

Cécillon

Chenu

et al. 2018

Soil Biology and Biochemistry

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Soil respiration tests and abundance of particulate organic matter (POM) are considered as classical indicators of the labile soil organic carbon (SOC) pool. However, there is still no widely accepted standard method to assess SOC lability and the pertinence of these two time-consuming methods to characterize SOC turnover can be questioned. Alternate ways of determining the labile SOC fraction are thus much needed. Thermal analyses, in particular Rock-Eval 6 (RE6) analysis has shown promising results in the determination of SOC biogeochemical stability.Using a large set of samples (n = 99) of French forest soils representing contrasted pedoclimatic conditions, including deep samples (up to 0.8 m depth), we compared three different methods used for SOC lability assessment. We explored whether respired-C isolated by a 10-week laboratory soil respiration test, POM-C isolated by a physical SOC fractionation scheme (particle-size > 50 μm and d < 1.6 g cm−3) and several RE6 parameters were comparable and how they correlated.As expected, respired-C (mg CO2-C·g−1 SOC) and POM-C (% of total SOC) fractions strongly decreased with depth. RE6 parameters showed that SOC from deeper soil layers was also thermally less labile, more oxidized and H-depleted. Indeed, SOC from deeper soil layers had lower proportion of thermally labile SOC, higher T50_HC_PYR (temperature at which 50% of the pyrolysable hydrocarbons were effectively pyrolyzed) and T50_CO2_OX (temperature at which 50% of the CO2 gas had evolved during the oxidation phase), larger oxygen index, and smaller hydrogen index. Surprisingly, the two classical indicators of the labile SOC pool (respired-C and POM-C) were only marginally correlated (p = 0.051) and showed layer-specific correlations. Similarly, respired-C was poorly correlated to RE6 parameters. Conversely, the POM-C fraction showed a strong negative correlation with T50_HC_PYR (ρ = −0.73) and good correlations with other RE6 parameters.Our study showed that RE6 parameters were good estimates of the POM-C fraction, which represents a labile SOC pool with a residence time of ca. a couple decades that is meaningful regarding SOC stock changes upon modifications in land management. RE6 thermal analysis could therefore be a fast and cost-effective alternative to more time-consuming methods used in SOC pool determination, and may be integrated into soil monitoring networks to provide high-throughput information on SOC dynamics

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Labile Organic Carbon Fractions, Regulator of CO₂ Emission: Effect of Plant Residues and Water Regimes

Cited by 13 publications

References 53 publications

Cereal-Legume Mixed Residue Addition Increases Yield and Reduces Soil Greenhouse Gas Emissions from Fertilized Winter Wheat in the North China Plain

Cereal-Legume Mixed Residue Addition Increases Yield and Reduces Soil Greenhouse Gas Emissions from Fertilized Winter Wheat in the North China Plain

Factors affecting distribution patterns of organic carbon in sediments at regional and national scales in China

Is Rock-Eval 6 thermal analysis a good indicator of soil organic carbon lability? – A method-comparison study in forest soils

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Labile Organic Carbon Fractions, Regulator of CO2 Emission: Effect of Plant Residues and Water Regimes

Cited by 13 publications

References 53 publications

Cereal-Legume Mixed Residue Addition Increases Yield and Reduces Soil Greenhouse Gas Emissions from Fertilized Winter Wheat in the North China Plain

Cereal-Legume Mixed Residue Addition Increases Yield and Reduces Soil Greenhouse Gas Emissions from Fertilized Winter Wheat in the North China Plain

Factors affecting distribution patterns of organic carbon in sediments at regional and national scales in China

Is Rock-Eval 6 thermal analysis a good indicator of soil organic carbon lability? – A method-comparison study in forest soils

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Labile Organic Carbon Fractions, Regulator of CO₂ Emission: Effect of Plant Residues and Water Regimes