中文摘要：

以江汉平原四湖地区果园、旱地、水旱轮作、水田等利用方式下的土壤为研究材料，通过分析有机质质量分数、粘土矿物与铁铝氧化物的组成特点，探讨了该区土壤有机质与粘粒矿物之间的交互作用。结果表明各土地利用方式下表层土壤的粘土矿物均以2：1型矿物为主，约占70％～80％；不同土地利用方式下表层土壤有机质质量分数、非晶质铁铝氧化物及铁的活化度大小顺序均为：水田〉水旱轮作〉旱田〉果园；土壤非晶质氧化铁（Fe0）质量分数和粘土矿物中高岭石的质量分数分别与土壤有机质质量分数呈极显著正相关和显著正相关，且Fe0与高岭石质量分数呈显著正相关。江汉平原四湖地区不同土地利用方式下，表层土壤中的Fe0与高岭石强烈作用，利于土壤对有机碳的固定。研究结果有助于理解人为干扰下区域土壤的固碳机制。

英文摘要：

This study analyzed soil organic matter contents and composition characteristics of phyllosilicate minerals and Fe-AI oxides in Jianghan Plain for different land uses of orchard, dry land, flood-drought rotation and paddy field. We also investigated the interactions between soil organic matter and clay minerals. The results showed that phyllosilicate minerals of topsoil dominated by 2 ： 1 type minerals, with the percentages of 70%--80%. Contents of organic matters and amorphous Fe-A1 oxides （Feo, Alo） and the Feo/Fea of the soils for different land uses were same in sequence as： paddy field〉flood-drought rotation〉dry land〉orchard. Amorphous Fe oxides （Feo） content in soil showed a highly significant positive correlation with soil organic matter contents, and kaolinite in clay minerals showed a significant positive correlation with soil organic matter content. The significant positive correlation between Feo contents and kaolinite contents suggested the strong interaction between Feo and kaolinite of the soils for different land uses which is contribute to soil organic carbon sequestration. The result is helpful for better understanding the mechanism of soil organic carbon sequestration in region soils under human activities.