The Contribution of Microorganisms to Soil Organic Carbon Stock Under Fertilization Varies among Aggregate Size Classes

Lu, Jing; Li, Shengping; Liang, Guopeng; Wu, Xueping; Zhang, Qiang; Gao, Chunhua; Li, Jianhua; Jin, Dongsheng; Fang, Zheng; Zhang, Mengni; Abdelrhman, Ahmed Ali; Degré, A.

doi:10.21203/rs.3.rs-140931/v1

Cited by 4 publications

(1 citation statement)

References 83 publications

(97 reference statements)

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“…As proposed by Qin et al (2019), the physical protection of SOM offered by aggregates could impede the temperature-driven enhancement of soil respiration. This observed pattern may be attributed to variations in microbial communities across different aggregate sizes (Lu et al, 2021). Nevertheless, the validity of this speculation requires further substantiation through more comprehensive investigations in the future.…”

Section: Effects Of Soil Aggregate Sizes On Soil Respirationmentioning

confidence: 80%

Influence of organic matter input and temperature change on soil aggregate-associated respiration and microbial carbon use efficiency in alpine agricultural soils

Zhang,

Gong,

Wan

et al. 2024

Soil Ecol. Lett.

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Soil aggregates affect soil respiration and its temperature sensitivity.• Organic matter input boosts soil respiration, affected by temperature and aggregate size.• Q 10 declines with increasing aggregate size, influenced by soil quality index.• Microbial CUE drops with organic matter input, temperature and aggregate size increase. Understanding the dynamics of soil respiration, microbial carbon use efficiency (CUE), and temperature sensitivity (Q 10 ) in response to exogenous organic matter (EOM) input, soil aggregate size, and incubation temperature is crucial for predicting soil carbon cycling responses to environmental changes. In this study, these interactions were investigated by 180-day incubation of soil aggregates supplemented with EOM at various temperatures (5°C, 15°C and 25°C). The results reveal an 'L-shaped' trend in soil respiration on the time scale across all treatments, characterized by initial rapid declines followed by stability. EOM input and higher temperatures significantly enhance respiration rates. Notably, the respiratory rates of soil aggregates of different sizes exhibit distinct patterns based on the presence or absence of EOM. Under conditions without the addition of EOM, larger aggregates show relatively lower respiration rates. Conversely, in the presence of EOM, larger aggregates exhibit higher respiratory rates. Furthermore, Q 10 decreases with increasing aggregate size. The relationship between Q 10 and the substrate quality index (SQI) supports the carbon quality temperature (CQT) hypothesis, highlighting SQI's influence on Q 10 values, particularly during later incubation stages. Microbial CUE decreases with EOM input and rising temperatures. Meanwhile, aggregate size plays a role in microbial CUE, with smaller aggregates exhibiting higher CUE due to enhanced nutrient availability. In conclusion, the intricate interplay of EOM input, aggregate size, and temperature significantly shapes soil respiration, microbial CUE, and Q 10 . These findings underscore the complexity of these interactions and their importance in modeling soil carbon dynamics under changing environmental conditions.

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Section: Effects Of Soil Aggregate Sizes On Soil Respirationmentioning

confidence: 80%

Influence of organic matter input and temperature change on soil aggregate-associated respiration and microbial carbon use efficiency in alpine agricultural soils

Zhang,

Gong,

Wan

et al. 2024

Soil Ecol. Lett.

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Impact of Corn Cob-Derived Biochar in Altering Soil Quality, Biochemical Status and Improving Maize Growth under Drought Stress

Ali

Manzoor

et al. 2021

Agronomy

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Biochar enhances soil fertility by improving the soil physical, chemical and microbiological properties. The aim of this study was to investigate the impact of corn cob-derived biochar on soil enzymatic activity, organic carbon, aggregate stability and soil microbial biomass carbon under drought stress. Biochar was prepared from crushed corn cobs pyrolyzed at 300 °C and 400 °C and applied at a ratio of 1% (w/w) and 3% (w/w) filled in pots. In each pot, three field capacity (FC) levels, i.e., 100, 70 and 40%, were maintained gravimetrically. Results showed that biochar application improved the growth (plant height and root length) and relative water content in maize leaves under drought stress, while it reduced electrolyte leakage compared to a control treatment. Aggregate stability was significantly (p ≤ 0.05) higher in biochar amended soil. Moreover, microbial biomass carbon and soil water also increased under drought stress at 70% FC and 40% FC, respectively, where 3% w/w (400 °C) biochar was applied. Among enzymes, β-glucosidase and alkaline phosphatase activity were improved with biochar application. The maximum organic carbon (240%, 246% and 249%, 254% more than control) was calculated in soils where 3% biochar pyrolyzed at 400 °C and 300 °C was mixed with soil, respectively. Similarly, the carbon pool index (CPI) and carbon management index (CMI) were also higher in biochar-amended soil as compared to control treatment. Conclusively, biochar amendment could effectively improve soil quality and maize growth under drought stress.

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Nitrogen Enrichment Regulates the Changes in Soil Aggregate-Associated Bacterial Community: Evidence from a Typical Temperate Forest

Lv,

Liu,

Hai

et al. 2023

Forests

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The nitrogen (N) enrichment induced by atmospheric N deposition affects both soil physicochemical properties and bacterial communities. However, how N enrichment affects soil aggregate-associated bacterial communities remains largely unclear. In this study, we conducted a two-year N addition experiment (four N levels: 0, 5, 10, and 20 g N m−2 year−1, corresponding to normal N, low N, medium N, and high N, respectively) in a Quercus liaotungensis Koidz–dominated forest. The distribution, nutrient content, and bacterial community composition of the soil aggregates were measured under various N enrichment conditions. N enrichment changed the aggregate distribution, increased the content of nutrients in aggregates, and altered the aggregate-associated bacterial community composition. N enrichment reduced the complexity of the bacterial co-occurrence network and degraded the interactions between bacteria compared with those observed under the normal N level. Aggregate-associated bacterial community was determined to be primarily affected by N enrichment level but not by aggregate size. The litter properties are the key factors affecting the composition of bacteria in aggregates. These findings improve our understanding of aggregate-associated bacterial responses to N enrichment and the related influencing factors.

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The Contribution of Microorganisms to Soil Organic Carbon Stock Under Fertilization Varies among Aggregate Size Classes

Cited by 4 publications

References 83 publications

Influence of organic matter input and temperature change on soil aggregate-associated respiration and microbial carbon use efficiency in alpine agricultural soils

Influence of organic matter input and temperature change on soil aggregate-associated respiration and microbial carbon use efficiency in alpine agricultural soils

Impact of Corn Cob-Derived Biochar in Altering Soil Quality, Biochemical Status and Improving Maize Growth under Drought Stress

Nitrogen Enrichment Regulates the Changes in Soil Aggregate-Associated Bacterial Community: Evidence from a Typical Temperate Forest

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