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9 results for “microbial necromass carbon”
The responses of microbial necromass carbon accumulation to climate aridity in alpine meadow soils are dominated by plant species richness
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Spatial distribution and driving factors of microbial necromass carbon in coastal wetlands of China
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Data of contents amino sugars and microbial necromass carbon in plant roots and the environmental variables
<p><span>Data display the results of environmental properties of 19 sampling sites, amino sugars and microbial necromass carbon (MNC) in the fresh roots of 27 dominant species and mixed roots (including dead roots) of mixed species in Inner Mongolian grasslands, AMF biomass and colonization rate in the fresh roots of 27 dominant species, contents of biomarkers (amino sugars and plant-derived lipids) and organic carbon during the decomposition experiment in model soils, and the relationships between environmental properties and root-borne MNC and their contribution to soil organic carbon.<br></span></p>
Climate warming alters the relative importance of plant root and microbial community in regulating the accumulation of soil microbial necromass carbon in a Tibetan alpine meadow
<p><span>Climate warming is predicted to considerably affect variations in soil organic carbon (SOC), especially in alpine ecosystems. Microbial necromass carbon (MNC) is an important contributor to stable soil organic carbon pools. However, accumulation and persistence of soil MNC across a gradient of warming are still poorly understood. An eight-year field experiment with four levels of warming was conducted in a Tibetan meadow</span><span>.</span> <span>We found that low-level (+0</span><span>-</span><span>1.5 ℃) warming mostly enhanced bacterial necromass carbon (BNC), fungal necromass carbon (FNC), and total MNC compared with control treatment across soil layers, while no significant effect was caused between high-level (+1.5</span><span>-</span><span>2.5 ℃) treatments and control treatments. The contributions of both MNC and BNC to soil organic carbon were not significantly affected by warming treatments across depths. Structural equation modeling analysis demonstrated that the effect of plant root traits on MNC persistence strengthened with warming intensity, while the influence of microbial community characteristics waned along with strengthened warming. Overall, our study provides novel evidence that the major determinants of MNC production and stabilization may vary with warming magnitude in alpine meadows. This finding is critical for updating our knowledge of soil carbon storage in response to climate warming.</span></p>
Data for: Exogenous carbon turnover within the soil food web strengthens soil carbon sequestration through microbial necromass accumulation
<p>Exogenous carbon turnover within soil food web is important in determining the trade-offs between soil organic carbon (SOC) storage and carbon emission. However, it remains largely unknown how soil food web influences carbon sequestration through mediating the dual roles of microbes as decomposers and contributors, hindering our ability to develop policies for soil carbon management. Here, we conducted a 13C-labeled straw experiment to demonstrate how soil food web regulated the residing microbes to influence the soil carbon transformation and stabilization process after 11 years no-tillage. Our work demonstrated that soil fauna, as a "temporary storage container", indirectly influenced the SOC transformation processes and mediated the SOC sequestration through feeding on soil microbes. Soil biota communities acted as both drivers of and contributors to SOC cycling, with 32.0% of exogenous carbon being stabilizing in the form of microbial necromass as "new" carbon. Additionally, the proportion of mineral-associated organic carbon and particulate organic carbon showed that the "renewal effect" driven by the soil food web promoted the SOC to be more stable. Our study clearly illustrated that soil food web regulated the turnover of exogenous carbon inputs and mediated soil carbon sequestration through microbial necromass accumulation.</p>
Climate warming alters the relative importance of plant root and microbial community in regulating the accumulation of soil microbial necromass carbon in a Tibetan alpine meadow
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Data for: Exogenous carbon turnover within the soil food web strengthens soil carbon sequestration through microbial necromass accumulation
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Data from: The vertical distribution and control of microbial necromass carbon in forest soils
<p><span><b>Aim:</b> Forest soils contain large amounts of terrestrial organic carbon (C), but the formation pathway of soil organic C (SOC) remains unclear. Recent evidence suggests that microbial necromass is a significant source of SOC, yet a global quantitative assessment across the whole-soil profile is lacking. We aimed to assess the vertical distribution and control of microbial-derived SOC in forest soils.</span></p> <p><span><b>Location:</b> Global forests.</span></p> <p><span><b>Time period:</b> 1996-2019.</span></p> <p><span><b>Major taxa studied:</b> Soil microbial necromass carbon.</span></p> <p><span><b>Methods:</b> We evaluated the proportions of fungal and bacterial necromass C in total SOC in the litter layer, O horizon soil, and various depths of mineral soil in forests using microbial biomarker (glucosamine and muramic acid) data.</span></p> <p><span><b>Results:</b> The total microbial necromass C increased significantly with soil depth, ranging from 30% of SOC in O horizon soil to 62% of SOC in mineral soils below 50 cm. However, only bacterial necromass C followed this increasing trend with soil depth; fungal necromass C showed little variation across the whole-soil profile. Higher fungal and bacterial necromass C was observed in soils with lower C/N ratios and smaller aggregate sizes. Soil C/N ratio and microbial biomass C dominantly determined microbial necromass C in surface soil (above 20 cm), but soil clay content was the primary factor in subsoil (below 20 cm).</span></p> <p><span><b>Main conclusions: </b>Microbial necromass C accounted for high percentages of the total SOC in forest soils (particularly at depths >20 cm), but its long-term stabilization may be governed by different mechanisms at different soil horizons. Substrate quality regulates microbial activity and then controls biomass turnover in surface soil, while aggregate occlusion could facilitate mineral protection of microbial necromass C in subsoil. These differential controls of microbial-derived organic C could be applied in Earth system studies for predicting soil organic C dynamics in forests.</span></p>
Data from: The vertical distribution and control of microbial necromass carbon in forest soils
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