Elucidating Soil Carbon Accumulation Mechanisms to Maximize Terrestrial Carbon Sequestration
Soil is the largest terrestrial carbon pool, and even slight variations in soil carbon content can significantly impact atmospheric carbon dioxide levels. Additionally, from an agricultural production perspective, soil carbon is directly related to soil fertility. Thus, understanding and managing soil carbon dynamics is essential for mitigating climate change and achieving sustainable agricultural and forestry production.
Our research group investigates the mechanisms of soil organic carbon (SOC) accumulation to enhance its quantity and stability. We focus on (1) stabilization characteristics, including the diverse organic carbon fixation capacities of various clay minerals and the chemical composition of accumulated SOC, and (2) decomposition characteristics, such as the community composition and functions of soil microorganisms responsible for SOC decomposition and cycling. Using stable isotope (13C/15N) analysis, we study soils from temperate to tropical regions to elucidate the amount and forms of SOC stabilized by major clay minerals. We also examine the decomposition and assimilation functions of soil microbial communities and the impact of microbial necromass on SOC accumulation.
Building on these mechanical studies of SOC dynamics, our goal is to develop agricultural and forestry management practices that maximize carbon sequestration based on the properties of soil clay minerals and microorganisms. By integrating cutting-edge technologies from engineering and oceanography, we aim to pioneer novel carbon sequestration techniques globally.
