2024 | Sajjad Raza, Annie Irshad, Andrew Margenot, Kazem Zamanian, Nan Li, Sami Ullah, Khalid Mehmood, Muhammad Ajmal Khan, Nadeem Siddique, Jianbin Zhou, Sacha J. Mooney, Irina Kurganova, Xiaoning Zhao, Yakov Kuzyakov
A bibliometric analysis reveals that soil inorganic carbon (SIC) is significantly underrepresented in global soil carbon (C) research compared to soil organic carbon (SOC). While SOC constitutes 96% of published studies, SIC accounts for only 4%, despite both pools being critical components of the global C cycle. SIC, which is more stable and long-lived (turnover rate over 1000 years in natural ecosystems), is often overlooked in research, applications, and modeling. Despite this, SIC studies have a higher research impact (citations per document) than SOC studies, particularly in the context of climate change. Recent trends in SOC research include topics like machine learning, biochar, and soil health, while SIC research focuses on digital soil mapping, soil acidification, and calcite. SOC research is more widely distributed globally, with 151 countries contributing, compared to 88 for SIC. The majority of soil C research is concentrated in a few countries, with China and the USA being the major producers, collaborators, and funders. SIC is a significant long-term C pool, but intensive agricultural practices have accelerated its losses, making it an important factor in the global C cycle and climate change. The lack of attention and investment in SIC research could hinder efforts to mitigate climate change impacts. This study calls for expanding research on SIC and incorporating SIC fluxes into C budgets and models to achieve a more comprehensive understanding of the global C cycle.A bibliometric analysis reveals that soil inorganic carbon (SIC) is significantly underrepresented in global soil carbon (C) research compared to soil organic carbon (SOC). While SOC constitutes 96% of published studies, SIC accounts for only 4%, despite both pools being critical components of the global C cycle. SIC, which is more stable and long-lived (turnover rate over 1000 years in natural ecosystems), is often overlooked in research, applications, and modeling. Despite this, SIC studies have a higher research impact (citations per document) than SOC studies, particularly in the context of climate change. Recent trends in SOC research include topics like machine learning, biochar, and soil health, while SIC research focuses on digital soil mapping, soil acidification, and calcite. SOC research is more widely distributed globally, with 151 countries contributing, compared to 88 for SIC. The majority of soil C research is concentrated in a few countries, with China and the USA being the major producers, collaborators, and funders. SIC is a significant long-term C pool, but intensive agricultural practices have accelerated its losses, making it an important factor in the global C cycle and climate change. The lack of attention and investment in SIC research could hinder efforts to mitigate climate change impacts. This study calls for expanding research on SIC and incorporating SIC fluxes into C budgets and models to achieve a more comprehensive understanding of the global C cycle.