Abstract
Background and aims
Dissolved organic matter (DOM) stands out as a highly active component within the organic matter pool. It is hypothesized to play a crucial role by adsorbing onto minerals and serving as a precursor for soil aggregates. However, the impact of DOM substrate types and addition levels on the intricate dynamics of soil aggregates remains elusive.
Methods
A 28-day short-term incubation experiment was conducted to investigate the responses of a Japanese Andisol to different DOM substrates, exploring the influence of three DOM substrates and two concentration levels. REOs concentrations in three aggregate fractions were measured on 0, 7, 14, and 28 days of incubation to calculate the aggregates transformation paths and relative aggregate change.
Results
DOM addition significantly increased aggregate stability in Andisols soil, evident in the elevated mean weight diameter (MWD) compared to the control (CK) treatment. The change of aggregate stability during incubation is determined by both DOM types and addition levels. The N-Acetyl-D( +)-Glucosamine (NADG) treatment, peaking at 14 days, whereas the vanillin (VAN) treatment reaching the highest MWD value before incubation (0 days). The increase in aggregate stability was reflected in the transformation paths of aggregates. NADG treatment, VAN treatment, and the NADG&VAN (MIX) mixture all contributed to reduced macroaggregate breakdown and inhibited the microaggregates breakdown. Furthermore, the relative changes in aggregate turnover exhibited varying trends across treatments. Regarding macroaggregate dynamics, the addition of vanillin, especially in the 100%VAN and 100%MIX treatments, significantly enhanced macroaggregate formation, with an increase of over 30% in the 100%MIX treatment after 28 days. Microaggregate dynamics varied among treatments. In the 100%NADG and 100%VAN treatments, there was an initial increase from 0 to 7 days, succeeded by a decrease from 7 to 28 days. The 50%VAN and 50%MIX treatments exhibited an increasing trend from 0 to 14 days, followed by a decrease from 14 to 28 days.
Conclusion
Overall, these findings highlight the important role of DOM in aggregate dynamics and suggest that the types and addition levels of DOM can significantly impact soil aggregate turnover pathways.
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Data availability
The datasets generated during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
We thank Prof.Wagai Rota for the management and maintenance of long-term field experiments, and our lab colleagues for the assistance of soil sampling and analyses. We would like to thank the China Scholarship Council for support this work through the award of a fellowship to Dr. Wang YK (grant no.202008610192).
Funding
This work was supported by Japan Society for the Promotion of Science, Program for Grant-in-Aid for Scientific Research (B) 21H02086 and Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences (grant no. E3V30020YZ).
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Y.K-W. & A-M. – Conceptualization, Investigation, Formal Analysis, Writing, Funding acquisition, Original Draft, Visualization; Q-J. – Investigation; Y.Y-H – Review & Editing, Supervision, Funding Acquisition, Project Administration; T-G. & W.F.-G– methodology; K-T. – Supervision, Review & Editing.
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Wang, Y., Asano, M., Huang, Y. et al. Effects of dissolved organic matter on soil aggregate dynamics using rare earth oxides as tracers in A Japanese Andisol. Plant Soil (2024). https://doi.org/10.1007/s11104-024-06695-7
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DOI: https://doi.org/10.1007/s11104-024-06695-7