There were apparent effects of long-term fertilization on labile organic matter fractionations in red soil and grey-desert soil,while its effects were less in loess soil and fluvo-aquic soil.

• 潮土以中活性有机质为主。施肥对红壤、灰漠土活性有机质组分影响明显,对垆土、潮土影响相对较小。