Long-Time Fertilization Affects The Binding Of Organic Ligands With Al (â…¢) In Soil Organic Matter And The Mechanism Of Organic Fertilizer

Long-time fertilization on soil organic matter as the research object, using spectroscopy characterization of the ion and aluminum metal interaction helps us understand the soil carbon pool, so it is essential.In this paper, through the study of infrared technology and three-dimensional fluorescence spectroscopy showed different fertilization treatments significantly influenced on soil dissolved organic matter, but not obvious on soil fulvic acid.2D FTIR correlation spectroscopy can present information about the binding of DOM, FA and HA with Al (Ⅲ) at the molecular level and the relative binding affinities sequencing of different organics with Al (Ⅲ). Specifically, dissolved organic matter: aliphatic→proteins→silicate and polysaccharides in the CK treatment; silicate and polysaccharide→aliphatic for the NPK treatment; aliphatic→silicate and polysaccharide→■aromatic in the M treatment; silicate and polysaccharide→aliphatic for the NPKM treatment. Fulvic acid:aliphatic→aromatic in the CK treatment; aliphatic hydroxyl (polysaccharide and silicate)→*lignin→aliphatic and protein for the NPK treatment; silicate polysaccharide→protein in the M treatment; polysaccharide and silicate→ protein (lignin, aliphatic) for the NPKM treatment. Humic acid:aromatic→polysaccharide and silicate→aliphatic in the CK treatment; polysaccharide and silicate→aliphatic and aromatic for the NPK treatment; aliphatic→polysaccharide and silicate→aromatic in the M treatment; polysaccharide and silicate→aliphatic→aromatic in the NPKM treatment. At the same time, we found that a significant amount of OH bonds (3420cm-land1120cm-1) was detected in soil samples from all the treatments, Meanwhile, the results of2D FTIR correlation spectroscopy further showed that the intra-hydrogen bond (3420cm-1) played an important role in binding with Al (Ⅲ) in all the treatments. However, the Si-O stretching of silicate was detected in the M and NPKM treatment and almost not in CK treatment.Finally, through the29Si and27A1solid state NMR and scanning transmission electron microscopy concluded that the mechanism of sequestration of high SOM in the M and NPKM treatment is attributable to the formation of non-crystalline minerals such as allophone and imogolite.