中文摘要：

对福建省建瓯市山地红壤的天然林、人工林、次生林、园地和耕地5种典型土地利用方式的不同土层（0-10 cm、10-20 cm）土壤团聚体颗粒有机碳进行研究。结果表明：林地、桔园在大团聚体中表现随着粒径增大颗粒有机碳贮量增加的趋势。天然林转变为其他土地利用方式后,土壤团聚体颗粒有机碳贮量平均下降了74.35%,土壤颗粒有机碳损失发生在各个粒级团聚体中。亚热带山地红壤内林地转变为农地会导致土壤及其团聚体颗粒有机碳含量下降,颗粒有机碳可作为表达土地利用变化敏感性指标。

英文摘要：

In order to assess the impact of land use change on soil particulate organic carbon（POC） in aggregates,the contents of POC of surface soil samples（0-10 cm,10-20 cm）were investigated in Jian＇ou city,Fujian province,China.Results showed that the storages of POC in macroaggregates in woodlands and Citrus aurantium land increased with increasing of aggregate sizes of macroaggregates.The mean storages of POC in bulk soil in 0-20 cm decreased by 74.35% while natural forest conversed into other land use practices,and the loss of POC in aggregates and in bulk soil was found in any aggregate size classes.It seemed in this site that POC was sensitive to land use change.