Study on characteristics and impact factors of soil organic carbon (SOC) in Hainan mango lands.

【Objective】By analyzing the total carbon amount and the content of organic carbon in physical components, the characteristics and impact factors of soil organic carbon(SOC)were illuminated to provide references for evaluating soil carbon pool in Hainan mango lands. 【Method】Using physical fractionation, mango land soil was grouped, and then the content of organic carbon in different aggregate was determined. 【Result】The content of soil organic carbon(SOC) in sand soil and granite red soil was 3.1-3.7 and 5.5-6.9 g/kg, respectively. The content of organic carbon in 53-250 μm and 53 μm fractionations of soil was higher than that of soil total organic carbon, and the content of organic carbon in 250 μm fractionations of soil was lower than that of soil total organic carbon. The content of total organic carbon and soil organic carbon was low in Hainan mango lands. The content of organic carbon in 53-250 μm and 53 μm fractionations of soil fell with the decreasing total organic carbon. 【Conclusion】The content of organic carbon in all soils and those physical fractionations were generally low. The influence of soil group on the content of organic carbon in soils and relative fractionations was greater than land use history.