Abstract
Abandoned agricultural fields (old fields) are thought to accumulate soil organic matter (SOM) after cultivation cessation. However, most research on old fields soil carbon (C) and nitrogen (N) sequestration has focused on the surface (10 or 30 cm depth) and overlooked their dynamics below 30 cm. This study quantified C and N stock change in both the surface and subsurface with repeated inventories over 13 years. We conducted repeated soil surveys in 8 old fields that form a 64-year chronosequence at Cedar Creek Ecosystem Science Reserve (CCESR), Minnesota in 2001 and 2014. On average, soil C and N accumulated by 16.5 ± 14.5 g C m−2 y−1 and 1.0 ± 1.1 g N m−2 y−1 in the surface (0–20 cm). In contrast, we found soil C and N decreased by 78.9 ± 26.3 g C m−2 y−1 and 12.9 ± 2.42 g N m−2 y−1 in the subsurface (20–100 cm). The C and N losses in the subsurface soil were correlated with low deep root biomass; the majority of roots are located in the top 20 cm of soil. Such root distribution may be attributed to the continuing dominance of nonnative and shallow-rooted C3 grasses and the lack of legumes after field abandonment. This study shows that agriculture has a long legacy effect after abandonment on subsurface soil C and N. Some abandoned agricultural fields can continue to lose C and N because surface C and N accumulation does not offset the ongoing deeper soil C and N losses.
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Acknowledgements
The work was accomplished using Cedar Creek LTER funds. Yi Yang was supported by the University of Nebraska-Lincoln, the School of Biological Sciences Special Funds, and Cedar Creek LTER funds. We thank Cathleen McFadden, Troy Mielke, Kally Worm, George Furey, Christine Holman, Abbey Neat, Tanner Hawkins, and Callie Heyes, without whom this study would not have been possible. Dave Wedin, Chad Brassil, Terry Loecke, and Sheri Fritz made helpful comments that improved the manuscript greatly.
Funding
The funding was provided by the Division of Environmental Biology of the National Science Foundation (Grant No. DEB-0080382(2000) and DEB-1234162(2013)).
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Author contributions YY and JK contributed equally on designing the study, performing the research, analyzing the data, and writing the paper.
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Yang, Y., Knops, J.M.H. Subsurface Soil Carbon and Nitrogen Losses Offset Surface Carbon Accumulation in Abandoned Agricultural Fields. Ecosystems 26, 924–935 (2023). https://doi.org/10.1007/s10021-022-00807-z
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DOI: https://doi.org/10.1007/s10021-022-00807-z