Abstract
Purpose
The chemistry of soil organic matter (SOM) is fundamental for sustainable and climate-smart agroecosystems. However, the differences in SOM chemistry between the upland and paddy soils developing under the same climatic and edaphic conditions are unclear.
Materials and methods
Py-GC/MS was applied to characterize the biochemical features of SOM in three physical size fractions: coarse particulate (> 0.25 mm, cPOM), fine particulate (0.053–0.25 mm, fPOM), and mineral-associated OM (< 0.053 mm, MAOM) of upland and paddy fields under long-term (> 30 years) mineral and manure fertilizations.
Results and discussion
Paddy fields had higher contents of soil organic carbon (SOC) and total nitrogen (TN) mainly accumulated in MAOM fraction than uplands. These two soils had different molecular compositions of SOM: N-containing compounds including amino-N and heterocyclic-N compounds enriched in the uplands, whereas paddy had higher proportions of lipids and phenolics. The SOM composition was also dependent on particle size, especially in the uplands, where POM fractions had high contents of lignin and MAOM accumulated N-containing components. In contrast, POM in paddy accumulated polysaccharides, whereas MAOM was enriched with lipids. Particle size controlled the C oxidation state (Cox), and paddy soils had higher Cox than that of uplands, mainly in the MAOM fraction.
Conclusions
The molecular composition SOM was primarily regulated by land-use type, following by fraction size and fertilization regime, while the Cox was controlled by fraction size. The Cox needs more attention to understand the direction of formation of SOM fractions.
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Data availability
Data will be made available on request.
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Acknowledgements
The authors greatly thank Yang Chen and Mingrui Yan for their helps during soil fractionation.
Funding
This work was supported by the National Natural Science Foundation of China (41930862, 31300381, and 31570523) and Natural Science Foundation of Jiangxi Province, China (20224BAB203033).
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Miao Feng: formal analysis, investigation, visualization, and writing—original draft. Kailou Liu: investigation, resources, and writing—review and editing. Yilai Lou: funding acquisition, methodology, and writing—review and editing. Yuntao Shang: lab analysis and writing—review and editing. Changcheng Guo: lab analysis and writing—review and editing. Zhaoliang Song: writing—review and editing. Anna Gunina: writing—review and editing. Yidong Wang: conceptualization, funding acquisition, methodology, project administration, supervision, and writing—reviewing and editing.
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Feng, M., Liu, K., Lou, Y. et al. Different biochemical composition and oxidation state of soil organic matter between upland and paddy fields. J Soils Sediments (2024). https://doi.org/10.1007/s11368-024-03782-1
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DOI: https://doi.org/10.1007/s11368-024-03782-1