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264 results for “soil organic carbon”
The main driver of soil organic carbon differs greatly between topsoil and subsoil in a grazing steppe
<p>1. Soil organic carbon (SOC) dynamics is regulated by a complex interplay of factors such as climate and potential anthropogenic activities. Livestocks play a key role in regulating the C cycle in grasslands. However, the interrelationship between SOC and these drivers remains unclear at different soil layers, and their potential relationships network have rarely been quantitatively assessed.</p> <p>2. Here, we completed a six-year manipulation experiment of grazing exclusion (no grazing: NG) and increasing grazing intensity (light grazing: LG, medium grazing: MG, heavy grazing: HG). We measurements of light fraction organic carbon (LFOC) and heavy fraction organic carbon (HFOC) in 12 plots along grazing intensity in three soil layers (topsoil: 0-10 cm, mid-soil: 10-30 cm, subsoil: 30-50 cm) to assess their underlying controls.</p> <p>3. Grazing significantly reduced SOC of the soil profile, but with significant depth and time dependencies. (1) SOC and SOC stability of the topsoil is primarily regulated by grazing duration (years). Specifically, grazing duration and grazing intensity increased the SOC lability of topsoil due to an increase in LFOC. (2) Grazing intensity was the major factor affecting the mid-soil SOC dynamics, among which MG had significantly lower SOC than did NG. (3) Subsoil organic carbon dynamics were mainly regulated by climatic factors. The increase in mean annual temperature (MAT) may have promoted the turnover of LFOC to HFOC in the subsoil.</p> <p>4. Synthesis and applications. When evaluating the impacts of grazing on soil organic fraction, we need to consider the differences in sampling depth and the duration of grazing years. Our results highlight that the key factors influencing SOC dynamics differ among soil layers. Climatic and grazing factors have different roles in determining SOC in each soil layer.</p>
MIMICS-BC_v1.0: Modeling biochar effects on soil organic carbon on croplands in a microbial decomposition model
<p>The code and data of MIMICS-BC_v1.0 related to the manuscript in submission</p>
Impact of deadwood decomposition on soil organic carbon sequestration in Estonian and Polish forests
<p>Data for publication.</p>
Evaluation of a microplate spectrophotometer for soil organic carbon determination in south central Idaho
<p>Determination of soil organic carbon (SOC) is highly desirable for assessing fertility and carbon sequestration; however, numerous methods of determination warrant study of method agreement. Recently, a novel method was developed following dichromate oxidation using a microplate spectrophotometer. This novel method was compared with (i) total C by dry combustion - soil inorganic carbon (DC<sub>w/o pretreatment </sub>- Pcal); (ii) traditional Walkley-Black titration (WBTIT) and (iii) loss on ignition (LOI<sub>360</sub><sub>°C</sub>) in calcareous soils of south central Idaho (n=75) in conjunction with North American Proficiency Testing program soils (n=10). A two-way ANOVA was fit with soils as a blocking factor to identify any difference between methods, means were separated using Tukey's HSD (α=0.05). Additional comparisons were made for all soils (n=85) and for soils in the lower 75<sup>th</sup> percentile of SOC determined by WBTIT (n=56) using regression analysis. Only the WBTIT and LOI<sub>360</sub><sub>°C</sub> methods were statistically equivalent nevertheless there was high agreement (Lin's concordance coefficients >0.90) between all methods (n=85). Under low SOC soils (n=56) the agreement between all methods decreased, but the WBSPEC method fit other methods comparatively well r<sup>2</sup>= 0.71, 0.74, and 0.78 for LOI<sub>360</sub><sub>°C</sub>, DC<sub>w/o pretreatment </sub>- Pcal, and WBTIT respectively. The WBSPEC method provided estimates of SOC between the methods currently used in the region while reducing hazardous waste generation over traditional WBTIT and sample handling over LOI<sub>360</sub><sub>°C</sub> and DC<sub>w/o pretreatment </sub>- Pcal methods, positioning it as a sensible option for SOC determination in low SOC calcareous soils of south central Idaho.</p>
Divergent contributions of living roots to turnover of different soil organic carbon pools and their links to plant traits
<p>1. Rhizodeposits and root litter contribute critically to soil organic carbon (SOC) formation and decomposition. This root-induced SOC turnover shows great interspecific variations. Bulk SOC consists of diverse functional pools differing in formation and stabilization. Yet, it remains unclear which plant traits regulate the effects of living roots on the turnover of different SOC pools across species.</p> <p>2. By performing <sup>13</sup>CO<sub>2 </sub>continuous<sub> </sub>labelling of six grassland species for a growing season in a climate-controlled chamber, we quantified the contributions of living roots to the dynamics of the fast-cycling particulate organic C and the slow-cycling mineral-associated organic C, and explored their relations to plant traits.</p> <p>3. The results showed that new root-derived SOC varied more than threefold among the six species. The variation in new root-derived SOC was best explained by the ratio of shoot to root biomass. Plant species with higher shoot:root ratio formed more new root-derived SOC. Most of the root-derived C (72%) was incorporated into the particulate organic C pool. All species caused positive rhizosphere priming effects (RPE), which varied sevenfold across species. Among plant traits, specific root length was the best predictor of interspecific variations in the RPE, with greater RPE associated with higher specific root length. Most of the RPE (70%) occurred in the mineral-associated organic C pool. Our results also showed that most plant species caused more old SOC decomposition via the RPE than new SOC formation, leading to net SOC losses, especially for the mineral-associated organic C pool.</p> <p>4. Overall, we provide novel insights into the effects of plant traits on root-induced turnover of particulate and mineral-associated organic C. Our findings should be valuable for understanding how specific plant traits regulate SOC accumulation and stabilization.</p>
Covariates dataset for "Temporal harmonization of a national dataset for spatial prediction of soil organic carbon"
<p>Environmental covariates used to predict the spatial distribution of soil organic carbon for the article 'Temporal harmonization of a national dataset for spatial prediction of soil organic carbon'</p>
Supplementary material 1 from: Balestrini R, Delconte C, Buffagni A, Fumagalli A, Freppaz M, Calvo E, Buzzetti I (2019) Dynamic of nitrogen and dissolved organic carbon in an alpine forested catchment: atmospheric deposition and soil solution trends. In: Mazzocchi MG, Capotondi L, Freppaz M, Lugliè A, Campanaro A (Eds) Italian Long-Term Ecological Research for understanding ecosystem diversity and functioning. Case studies from aquatic, terrestrial and transitional domains. Nature Conservation 34: 41-66. https://doi.org/10.3897/natureconservation.34.30738
: Data type: statistical data
Soil organic carbon stabilization is dominated by non-sorptive process among the subsoils from different parent material
<p>Soil physical and chemical properties from different parent materials in subtropical China.</p>
Carbon burial in soils of the Great Marsh, DE: Evaluating accumulation rates and organic matter composition
<p>This data was collected to address the research questions listed in Rachel Owrutsky's master's thesis (2022) titled <em>Carbon burial in soils of the Great Marsh, DE: evaluating accumulation rates and organic matter composition. </em></p>
Organic carbon dynamics in clay soils: impact of management practices on microorganism structure and abundance under semi-arid conditions
<p>Proper management of soil organic matter in arid and semi-arid regions improves organic carbon storage in the soil, helps in compact soil degradation, mitigates climate change impacts, and preserves ecosystem functionality and sustainability food security. This study aims to provide a better insight into the biogeochemical processes that drive the organic carbon dynamics of saline clay soil in a semi-arid area. The study is not intended to be exhaustive but contributes to analyzing the relationship between bacterial microflora, physicochemical properties, and organic carbon dynamics as a function of different soil management modes. The monitoring was carried out on three different plots located at the National Institute of Agronomic Research of Algeria. A physicochemical characterization of the soils was performed. A metagenomic study was also conducted to identify bacterial biodiversity using PCR-amplified DNA sequencing. The study results show that the control plot has the highest average organic carbon stock value at 47 Mg ha-1. This was followed by the amended plot and the conventional plot, respectively, with 43 Mg ha-1 and 38 Mg ha-1. In the context of this study, organic carbon dynamics would appear to depend on the interaction of several biotic and abiotic factors. Soil management methods would impact the density and diversity of bacterial microflora. This, in turn, affects the soil's physicochemical properties and, more specifically, organic carbon dynamics and storage.</p>
Influence of grain size, organic carbon and organic matter residue content on the sorption of per-and polyfluoroalkyl substances in aqueous film forming foam contaminated soils-Implications for remediation using soil washing
<p>Supporting information from Influence of grain size, organic carbon and organic matter residue content on the sorption of per-and polyfluoroalkyl substances in aqueous film forming foam contaminated soils-Implications for remediation using soil washing</p>
Data from: An alternative approach to reduce algorithm-derived biases in monitoring soil organic carbon changes
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Data from: Spatial-temporal variability and related factors of soil organic carbon in Henan province
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Evaluation of a microplate spectrophotometer for soil organic carbon determination in south central Idaho
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Data from: Warming alters surface soil organic matter composition despite unchanged carbon stock in a Tibetan permafrost ecosystem
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Data from: Soil organic carbon dynamics matching ecological equilibrium theory
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Data from: Direct and indirect effects of nitrogen enrichment on soil organisms and carbon and nitrogen mineralization in a semi‐arid grassland
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Fluxes and concentrations of dissolved organic carbon in soils
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Herbivore grazing mitigates the negative effects of nitrogen deposition on soil organic carbon in low-diversity grassland
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Divergent contributions of living roots to turnover of different soil organic carbon pools and their links to plant traits
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