Abstract: The maintenance and improvement of soil fertility greatly rest with the quantity and quality of soil organic carbon (SOC), while the study of SOC pool in farmland ecosystem is a main research direction of agricultural, ecological,and environmental sciences. Land use, cul-tivation, crop selection, planting density, irrigation, fertilization, and other anthropogenic act-ivities all affect the dynamics of SOC pool. This paper summarized the research advances on the SOC pool and its affecting factors in farmland ecosystem, soil C sequestration potential, measures for maintaining and improving SOC pool, and potential roles of farmland soil C sequestration in mitigating greenhouse gases emission and climate change. The future research directions of SOC pool in farmland ecosystem were also put forward.

Key words: Astragalus adsurgens, Cultured root, Culture filtrate, Allelopathy