Abstract:

By investigating the greenhouse cultivation of different region in Liaoning province and analyzing both the greenhouse and open field soil samples, soil organic carbon ,carbon management index and soil available nutrient and their elationship were thus studied. The results indicated: (1) The contents of soil organic carbon and labile carbon in topsoil (0～20cm) of greenhouse were obviously higher than those in the corresponding open field soils and the contents fluctuated between increase and decrease with planting years. (2) Under greenhouse cultivation, carbon pool lability and carbon management index increased in first four planting years and then decreased,which had the same trend to sustainable utilization of greenhouse. (3) The content of labile carbon significantly correlated with soil available nutrients of P, K,S,Mg,Fe and Zn and this index could sensitively reflect the impacts of different agricultural practice on soil fertility quality and its potential productivity.