期刊
CHEMOSPHERE
卷 138, 期 -, 页码 225-232出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2015.05.089
关键词
Soil colloids; Mineral-organo associations (MOAs); Nano-scale secondary ion mass spectrometry (NanoSIMS); X-ray absorption near edge structure (XANES); Confocal laser scanning microscopy (CLSM)
资金
- National Natural Science Foundation of China [41371248, 41371299]
- National Basic Research Program of China [2011CB100503]
- Natural Science Foundation of the Jiangsu Province of China [BK20131321]
- Qing Lan Project
- Innovative Research Team Development Plan of the Ministry of China [IRT1256]
- 111 Project [B12009]
- Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions
Mineral-organo associations (MOAs) are a mixture of identifiable biopolymers associated with highly reactive minerals and microorganisms. However, the in situ characterization and correlation between soil organic matter (SOM) and highly reactive Al and Fe minerals are still unclear for the lack of technologies, particularly in the long-term agricultural soil colloids at submicron scale. We combined several novel techniques, including nano-scale secondary ion mass spectrometry (NanoSIMS), X-ray absorption near edge structure (XANES) and confocal laser scanning microscopy (CLSM) to characterise the capacity of highly reactive Al and Fe minerals to preserve SOM in Ferralic Cambisol in south China. Our results demonstrated that: (1) highly reactive minerals were strongly related to SOM preservation, while SOM had a more significant line correlation with the highly reactive Al minerals than the highly reactive Fe minerals, according to the regions of interest correlation analyses using NanoSIMS; (2) allophane and ferrihydrite were the potential mineral species to determine the SUM preservation capability, which was evaluated by the X-ray photoelectron spectroscopy (XPS) and Fe K-edge XANES spectroscopy techniques; and (3) soil organic biopolymers with dominant compounds, such as proteins, polysaccharides and lipids, were distributed at the rough and clustered surface of MOAs with high chemical and spatial heterogeneity according to the CLSM observation. Our results also promoted the understanding of the roles played by the highly reactive Al and Fe minerals in the spatial distribution of soil organic biopolymers and SOM sequestration. (C) 2015 Elsevier Ltd. All rights reserved.
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