土壤易氧化碳(readily oxidizable carbon,ROC)作为指示土壤有机碳(SOC)早期变化的敏感指标,对研究人类干扰及全球变化背景下的土壤有机碳库稳定性及其动态具有重要的指示意义.为深入了解土地利用变化对土壤易氧化碳含量的影响,本文对苏北沿海地区草地、农田、杨-农复合经营及杨树纯林4种不同土地利用方式的土壤ROC含量及其相关因子进行了测定.结果表明:苏北沿海地区不同土地利用类型的ROC含量表现为草地<农田<杨-农复合系统<杨树林,不同土地利用方式间ROC含量在0～10cm土层差异最为显著;ROC及ROC/SOC随着土层深度的增加而递减,且不同土层之间差异显著;4种土地利用方式ROC的季节变化趋势一致,其值均为夏季最大,冬季次之,春季最小;ROC与土壤pH值、土壤容重呈极显著负相关,与SOC、土壤水溶性有机碳(WSOC)、全N、土壤C/N、Mg呈显著或极显著正相关,而与土壤湿度、全P的相关性不显著.土地利用方式的变化显著影响了土壤易氧化碳的空间分布特征,土壤容重、pH值、全N和SOC是ROC在不同土地利用方式间产生差异的主要原因. As a sensitive indicator of early changes in soil organic carbon (SOC), readily oxidizable carbon (ROC) plays an important role in studying the stability and dynamics of soil organic carbon pool in the context of human disturbance and global change. In order to understand the effect of land use change on soil easily oxidized carbon, soil ROC content and its related factors in four different land use types of grassland, farmland, poplar-agroforestry and poplar pure forest in coastal area of ​​northern Jiangsu were measured The results showed that the ROC content of different land use types in coastal area of ​​northern Jiangsu Province showed that the content of ROC in 0 ~ 10cm soil layer was the most significant in the grassland