Journal
PROCESSES
Volume 10, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/pr10112425
Keywords
nitrogen; particulate organic carbon (POC); mineral-associated organic carbon (MAOC); stabilization mechanisms; soil
Categories
Funding
- Ministry of Science and Technology of China [2022xjkk0300]
- National Natural Science Foundation of China [11275301, 12075261]
- Innovation Fund of the Institute of High Energy Physics, Chinese Academy of Sciences (2021)
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The effect of nitrogen on the sequestration of soil organic carbon (SOC) is controversial, and this study reviews the progress of recent studies on different SOC stabilization mechanisms to facilitate a comprehensive understanding.
Carbon and nitrogen are the essential elements constituting living organisms and are closely coupled during biogeochemical cycles. Due to the atmospheric nitrogen deposition and increased agricultural nitrogen fertilizer input, the effect of nitrogen on the sequestration of soil organic carbon (SOC) is controversial. To facilitate a comprehensive understanding of this issue, the progress of recent studies on the different SOC stabilization mechanisms is reviewed. Based on the differences in the stability and fate mechanisms of particulate organic carbon (POC) and mineral-associated organic carbon (MAOC), nitrogen input can increase POC input and inhibit microbial decomposition of POC by increasing terrestrial biomass, changing the quality of litter and promoting the formation of aggregates. N input reduces the chemical stability of MAOC by altering the chemical bonding of mineral-organic complexes. This study has promising implications for understanding the effect of N on SOC transformation by different stabilization mechanisms to promote soil carbon sequestration.
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