Inorganic carbon is overlooked in global soil carbon research: A bibliometric analysis

Raza, Sajjad; Irshad, Annie; Margenot, Andrew; Zamanian, Kazem; Li, Nan; Ullah, Sami; Mehmood, Khalid; Ajmal Khan, Muhammad; Siddique, Nadeem; Zhou, Jianbin; Mooney, Sacha J.; Kurganova, Irina; Zhao, Xiaoning; Kuzyakov, Yakov

doi:10.1016/j.geoderma.2024.116831

Cited by 18 publications

(2 citation statements)

References 59 publications

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“…Agricultural management influences SIC stocks and emission dynamics through practices that alter soil structure and composition and pH, such as tillage (Bughio et al, 2017;Mehra et al, 2019;Plaza-Bonilla et al, 2015), crop rotation (Kim et al, 2020b) and irrigation (Ball et al, 2023;de Soto et al, 2017;Sanderman, 2012), and the application of fertilizers and amendments (Ahmad et al, 2015;Perrin et al, 2008). Evidence for tillage and cover cropping effects on SIC stocks are sparse (Mehra et al, 2019) and mostly conducted in dryland soils, therefore this study provides some of the first evidence that cover cropping and intensive tillage may increase SIC stock in temperate agricultural soils, and that the microbial biomass may also influence SIC development, despite the soil pH in this study being theoretically less conducive to carbonate precipitation (Raza et al, 2024;Zamanian et al, 2016). As previously discussed, we hypothesized that tillage may accelerate carbonate dissolution as it increases water and CO2 in pore spaces, thereby altering pH.…”

Section: Intensive Tillage Cover Cropping and Microbial Biomass Are P...mentioning

confidence: 74%

“…It is arguably one of the most important indicators of soil fertility, and because of its central role in a range of soil functions, is also the most measured soil parameter (Karlen et al, 2001;Stockmann et al, 2015). Only recently has the other soil carbon -soil inorganic carbon -become of interest to researchers, land managers, and policy makers (Raza et al, 2024). This is likely because the majority of calcareous, soil inorganic carbon (SIC) containing soils are found in drylands (Amiotte Suchet et al, 2003;Gaillardet et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Soil organic and inorganic carbon interactions under tillage and cover cropping determine potential for carbon accumulation in temperate, calcareous soils

Ball,

Guo,

Hallett

et al. 2024

Preprint

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The global soil carbon pool comprises soil organic carbon (SOC), found in almost all soils, and soil inorganic carbon (SIC), in calcareous soils. Despite their agricultural significance, calcareous soils, mostly prevalent in drylands and often alkaline, are historically understudied. Using soils obtained from a decade-long, fully factorial field experiment located on temperate, near neutral pH, calcareous soils, this study examined the influence of cover crops (no-cover vs radish) and three levels of tillage intensity: shallow (10 cm) and deep (20 cm) non-inversion, and plough (25 cm inversion) on SOC and SIC stocks. Further, considering recent experimental and observational evidence indicating the interactions of SOC and SIC pools and their likely microbial control, we also investigated how SOC, the soil microbial biomass pool, and SIC are correlated. For SOC stock, there were significant interactions with total SIC and SOC:SIC ratio that differed by tillage intensity. Across the whole soil profile (0-60 cm), there was a significantly positive relationship between SOC content and SIC stock that was only present with ploughing. Further, at low SOC:SIC ratios (~0.5-3.0), while SOC stock was marginally lower under plough, at higher SOC:SIC ratios (~3.1–10.0), SOC stock was predicted to be up to ~4–fold greater (4 kg m-2) with ploughing than the lower intensity tillage treatments. This result highlights a critical SOC-SIC interaction that, depending on tillage intensity, may offset anticipated disturbance-related loss of SOC. SOC stock was also ~40% (0.42 kg m-2) greater at 0-10 cm and ~30% (0.2 kg m-2) greater at 30-40 cm under radish cover crop than without. SIC stock differences were determined by SOC content, tillage intensity and cover cropping. SIC stock was strongly correlated with SOC, with a predicted ~0.3–1 kg m-2 increase in SIC stock for ~1% increase in SOC. Under radish cover crops and with ploughing, there was ~0.7 kg m-2 more SIC than under all other conditions. Microbial biomass was positively correlated with SIC stock suggesting a causality that needs experimental testing. Given that reduced tillage is a frequently recommended practice to increase soil carbon storage and given the limited attention that has been paid to the influence of cover cropping on the SIC pool, our results indicate the need for further investigation around the dynamics of SOC and SIC interactions and stabilization processes in calcareous soils and highlights the pitfalls of a one-size-fits-all approach to soil carbon management.

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Section: Intensive Tillage Cover Cropping and Microbial Biomass Are P...mentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Soil organic and inorganic carbon interactions under tillage and cover cropping determine potential for carbon accumulation in temperate, calcareous soils

Ball,

Guo,

Hallett

et al. 2024

Preprint

View full text Add to dashboard Cite

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Contrasting responses of soil organic and inorganic carbon pools under plant invasion in tropical coral islands

Li,

Yan,

Cai

et al. 2024

Biological Diversity

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Plant invasions pose significant threats to biodiversity and ecosystem functioning, but their impact on soil carbon (C) pools in island ecosystems remains underexplored. This study examined the responses of soil total C (TC), organic C (SOC), inorganic C (SIC), and microbial‐derived C (i.e., amino sugars (ASs) and glomalin‐related soil proteins (GRSP)) in tropical island forests invaded by Cassytha filiformis, Eupatorium odoratum, and Wedelia biflora. Results revealed that invasions substantially reduced aboveground and belowground biomasses of local plant communities with increasing invasion degree, yet the soil TC pool size remained nearly unaffected due to increased SIC offsetting decreased SOC. The effects on soil C pools depended on the invasive species and sampling season. E. odoratum and W. biflora invasions significantly reduced microbial‐derived C concentrations (ASs and GRSP) but increased their contribution to the SOC pool during the wet season, whereas C. filiformis invasion reduced microbial‐derived C only in the dry season. The study highlights the tradeoff between SOC and SIC in regulating soil C pools and emphasizes the need for context‐specific management strategies. Despite the stable soil TC pool, the loss of SOC's multifunctional benefits necessitates targeted strategies to mitigate invasions' adverse effects on ecosystem health and carbon storage.

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Optimal nitrogen management increased topsoil organic carbon stock and maintained whole soil inorganic carbon stock to increase soil carbon stock—A 15-year field evidence

Wang,

Zhang,

Lakshmanan

et al. 2025

Agriculture, Ecosystems & Environment

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Inorganic carbon is overlooked in global soil carbon research: A bibliometric analysis

Cited by 18 publications

References 59 publications

Soil organic and inorganic carbon interactions under tillage and cover cropping determine potential for carbon accumulation in temperate, calcareous soils

Soil organic and inorganic carbon interactions under tillage and cover cropping determine potential for carbon accumulation in temperate, calcareous soils

Contrasting responses of soil organic and inorganic carbon pools under plant invasion in tropical coral islands

Optimal nitrogen management increased topsoil organic carbon stock and maintained whole soil inorganic carbon stock to increase soil carbon stock—A 15-year field evidence

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