Plant Soil Environ., 2021, 67(10):588-599 | DOI: 10.17221/350/2021-PSE

Variation of soil organic matter depends on light-fraction organic matter under long-term monocropping of different cropsOriginal Paper

Futao Zhang1,2,3, Yunfa Qiao*,4, Xiaozeng Han1, Bin Zhang*,1,2,3
1 National Observation Station of Hailun Agroecology System, Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin, P.R. China
2 University of Chinese Academy of Sciences, Beijing, P.R. China
3 National Engineering Laboratory for Improving Quality of Arable Land, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, P.R. China
4 Nanjing University of Information Science and Technology, Nanjing, P.R. China

Cultivating crops influences soil organic matter (SOM), but the effect of different crops remains unclear, particularly under long-term monocropping. The objective of this study was to identify how different crops influence the content and chemical structures of SOM under long-term monocropping. Here, soils were sampled (0-20 cm) under 27-year soybean and maize monocropping and separated into different physical fractions. The content and chemical structures of SOM in all fractions were determined. SOM contents were higher under soybean than maize in bulk soil and macroaggregates and their light-fractions instead of microaggregates and silt and clay. The difference in SOM chemical structure was observed in aggregates and density fractions rather than bulk soils and supported by the result of principal component analysis. The proportion of O-alkyl C in macro- and microaggregates and all free light fractions and that of aromatic C in mineral-associated fractions were higher, while that of carbonyl C was lower under maize than soybean. These results demonstrated that different crops monocropping influences the content and chemical structures of SOM, and the variations were mainly in the light-fraction SOM and highlight a higher sensitivity of physical fractions than bulk soil to different crops.

Keywords: Mollisol; crop species; chemical stability; farmland; carbon turnover

Published: October 31, 2021  Show citation

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Zhang F, Qiao Y, Han X, Zhang B. Variation of soil organic matter depends on light-fraction organic matter under long-term monocropping of different crops. Plant Soil Environ. 2021;67(10):588-599. doi: 10.17221/350/2021-PSE.
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