Visualizing Mineral-Associated Organic Matters in Long-Term Fertilization Treated Soils by NanoSIMS and SR-FTIR
Formation of mineral-associated organic matters is essential for long-term soil organic carbon preservation. However, the regulation pathways of mineral-associated organic matters in soils remains largely undescribed, especially at the submicron scale. Using a well-controlled long-term (32 years) fi...
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Published in | Frontiers in Soil Science (Online) Vol. 2 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Frontiers Media S.A
08.02.2022
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Subjects | |
Online Access | Get full text |
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Summary: | Formation of mineral-associated organic matters is essential for long-term soil organic carbon preservation. However, the regulation pathways of mineral-associated organic matters in soils remains largely undescribed, especially at the submicron scale. Using a well-controlled long-term (32 years) field experiment at the Jiangxi Institute of Red Soils, Jinxian, China, we showed that long-term manure fertilization significantly (
P
< 0.05) increased the available Al and Fe concentrations over one order of magnitude in soil water dispersible colloids compared to no fertilization and chemical fertilization. Nano-scale secondary ion mass spectrometry (NanoSIMS) images and region of interest (ROI) analysis provided direct evidence demonstrating that long-term manure fertilization increased the
27
Al
16
O
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/
12
C
−
,
27
Al
16
O
−
/
12
C
14
N
−
,
56
Fe
16
O
−
/
12
C
−
, and
56
Fe
16
O
−
/
12
C
14
N
−
ratios compared to no fertilization and chemical fertilization. This finding revealed that long-term manure fertilization may potentially enhance the stability of organic carbon and nitrogen. Synchrotron radiation based FTIR spectromicroscopy further supported that secondary minerals (<950 cm
−1
) were co-localized with amines, lipids, and proteins in the long-term manure fertilization, but only co-localized with proteins in the no fertilization and chemical fertilization. To summarize, our findings highlight the importance of manure inputs in increasing formation of mineral-associated organic matters and thus potentially increasing soil carbon persistence. |
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ISSN: | 2673-8619 2673-8619 |
DOI: | 10.3389/fsoil.2022.847623 |