1.4nm蛭石型羟基间层黏土矿物（1.4nm-HIV）是红壤的重要组成矿物，是经长期强烈淋溶作用形成的环境指示型黏土矿物。其与红壤腐殖质等的结合对红壤碳循环等起到重要作用。然而，1.4nm-HIV的重要结构和表面性质还不清楚，其与红壤腐殖质的界面作用机制研究更是尚未开展，这严重制约了对红壤“固碳”机制的认识。本项目拟以提取自红壤的1.4nm-HIV矿物和合成的该类矿物为研究对象，研究该矿物的主要结构和表面性质（尤其是羟基铝赋存特征和固体酸性等）；进而研究其与红壤典型腐殖质——胡敏酸和富啡酸的界面作用，重点探索1.4nm-HIV的结构和性质如何作用于其与腐殖酸的吸附等界面反应。项目的成果将显著提升对1.4nm-HIV矿物乃至其与红壤典型腐殖酸的界面作用的认识，为全面、深入理解1.4nm-HIV等典型黏土矿物在我国红壤碳循环过程中的作用机制奠定理论基础。

Hydroxyl aluminum-interlayered vermiculite-based clay mineral with 1.4 nm spacing distances (1.4nm-HIV) is the important mineral of red earth. 1.4nm-HIV, which formed after long-term intense eluviation in the topsoil is also the index mineral for environmental information during its formation processes. The association between 1.4nm-HIV and soil organic matters (SOM) plays an important role for carbon cycle of red earth. However, the properties of 1.4nm-HIV and the interface reaction mechanism between 1.4nm-HIV and soil organisms remain unclear, resulting in the difference in understanding the carbon fixation of red earth. In this study, raw 1.4nm-HIV and artificial sample will be selected as the model to investigate their structure and surface properties. The structure and surface properties of 1.4nm-HIV, especially the occurrence of hydroxyl aluminum in the interlayer space and surface solid acidity of 1.4nm-HIV will be investigated. Furthermore, the mechanism of interface reaction such as adsorption between 1.4nm-HIV and humic acid and fulvic acid will be explored, and in particularly, the influence mechanism of such properties of 1.4nm-HIV on the interface reaction mechanism will be focused on. The results will ascertain the structure and surface properties of 1.4nm-HIV, and will be in favor of further understanding the interface reaction mechanism between 1.4nm-HIV and SOM. This study will also provide the fundamental theory and experimental basis for the specific role of clay minerals such as 1.4nm-HIV in the carbon cycle of red earth in China.