The associations between organic and mineral matter in the horizons of an Amazonian humiluvic Spodosol profile were studied by investigating the composition of the constituent organic compounds, the surface wettability and the relationships among the chemical, structural, and microstructural properties using Fourier Transform Infrared (FTIR) spectroscopy and contact angle (CA) analysis. With increasing the profile depth, the CH FTIR absorption decreased accompanied by a relative increase in CO FTIR absorption. A number of significant correlations were found between the experimental variables measured. In particular, the positive correlation between soil organic carbon (SOC) (1.43 to 31.13 g kg⁻¹) and intensity of aromatic structural CC peak at 1620 cm⁻¹ downward the soil profile suggested the existence of higher amounts of more stable organic compounds with depth. The negative correlation between the intensity of aliphatic structures peaks from 3000 to 2800 cm⁻¹ and the clay minerals content indicated an increasing soil wettability with depth. The relative affinity of organic matter to mineral surfaces changed as a function of the mineral type distribution along the soil profile. As well, the chemical composition of organic matter and the type of phase fractions influenced whole soil wettability based on the SOC/clay relation to CA.

通过使用傅立叶变换红外光谱（FTIR）研究组成有机化合物的组成，表面润湿性以及化学，结构和微结构性质之间的关系，研究了亚马逊humiluvic Spodosol剖面视野中有机物和矿物质之间的关联。光谱学和接触角（CA）分析。随着轮廓深度的增加，C H FTIR吸收降低，同时C O FTIR吸收相对增加。在测量的实验变量之间发现许多显着的相关性。特别地，土壤有机碳（SOC）（1.43至31.13 g kg ^-1）与芳香结构C C强度在1620 cm ^-1处呈正相关。向下的土壤剖面表明存在更大量的深度更稳定的有机化合物。3000至2800 cm ^-1的脂族结构峰强度与粘土矿物质含量之间呈负相关关系，表明土壤的可湿性随深度增加。有机物对矿物表面的相对亲和力随沿土壤剖面的矿物类型分布而变化。同样，基于SOC /粘土与CA的关系，有机物的化学组成和相部分的类型也会影响整个土壤的润湿性。