Advance in Soil Organic Carbon Stock and the Impact factors on Orchard Ecosystem Research

Soil organic carbon is an important component of the global carbon cycle,and it has direct effects on the global carbon balance.Orchard is an important part of the land use pattern, the area of which accounted for 1.15% of the total land area in China.The research on soil organic carbon sequestration in orchards is an important scientific basis to accurately evaluate carbon sequestration potential of terrestrial ecosystems.This paper reviews the research results on the soil labile and stabile organic carbon, with the focus on the dynamics of their fractions in separation, content and allocation proportion under different land use type.Effects of climatic factors, soil texture, fertilizer, farming, surface cover and human trampling on soil organic carbon pool are analyzed, respectively.Finally, this summary highlights existing problems of soil organic carbon stock on orchard ecosystem and suggests future directions for progress together with some future topics for research.