Effect of land-use type on soil labile carbon pool and carbon management index

To study the effect of different land uses on soil labile organic carbon pool and carbon management index( CMI),four types of land use,including abounded land( AL) and three forest lands [Phyllostachys edulis forest( PE),P. edulis and Schima superba secondary forest( SS),Cunninghamia lanceolata forest( CL) ]were selected in Anfu County,Jiangxi Province. The result showed that soil labile organic matter pools in the different land-use types were in the order of PE( 14. 56 t·hm- 2) SS( 14. 41 t·hm- 2) CL( 13. 39 t·hm- 2) AL( 9. 53 t·hm- 2),and the values in the forest lands were significantly higher than in AL. After the land use was changed to forest land,total soil organic carbon,soil labile organic carbon,stable carbon content,carbon pool index were greatly improved; the values of labile carbon and labile carbon index were highest in SS,while the value of coefficient of oxidation stability was highest in PE. Taking AL as a reference,the CMI values of the different land-use types were in the order of SS( 184. 61) PE( 172. 58) CL( 150. 50) AL( 100). It is indicated that forest lands could function to improve soil fertility and were in good management situation,especially for SS.