Abstract: Cropland is one of the greenhouse gas emission sources, but also a possible sink at the other side. The influence factors of greenhouse gas emission from cropland soils especially from upland soils, including soil temperature, soil moisture, soil properties, fertilization and tillage methods, were reviewed. The possible mitigation practices which include optimum nitrogen fertilization management, nitrification inhibitor usage and carbon sink enhancement measures which include manure amendment, returning straw to the soil, conservation tillage were put forward. The implement possibilities and possible extension problems were analyzed too.

Key words: Greenhouse gases, CO2, CH4, N2O, Mitigation measures