Abstract
Background and aims
The impacts of atmospheric nitrogen (N) deposition on terrestrial ecosystem processes remain controversial, mostly because of the uncertainty regarding the fates of deposited N. We conducted a 16-week simulated deposition study to experimentally trace N in a greenhouse plant-soil system.
Methods
Using a two-way factorial design, we added (15NH4)2SO4 solution twice a week to pots containing different soil organic matter (SOM) content and with or without a live plant (Salix dasyclados). The recoveries of 15N in soil, plant biomass, and leaching solution were quantified.
Results
We found most 15N was retained in soil (18.0–59.2%), with significantly more 15N recovered from high-SOM soils than from low-SOM soils. Plant presence significantly increased 15N retention in soil. Plant biomass accounted for 10–20% of the 15N input, with proportionally more 15N assimilated when plants were grown in low-SOM soils. Leaching loss of 15N was relatively low (10–17%).
Conclusion
Our study suggests that SOM content and plant presence significantly affect the fates of deposited N. Indeed, N would be preferentially retained in soils with high SOM content and live plant, while plants would assimilate more deposited N when grown in low SOM soils. Global biogeochemical models thus need to incorporate such soil-specific N retention and plant N assimilation.
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Acknowledgments
We would like to thank many students from the Dept. of Biological Sciences, Binghamton University for helping collecting and assembling soils for this study. Dr. Kao-Kniffin from Cornell University provided a critical review. We would also like to acknowledge the critical comments from reviewers and editors that have improved the quality of this paper. This work was supported by the USDA National Research Initiative Competitive Grants Program–Soils and Soil Biology.
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Wang, W., Zhu, W. Soil retention of 15N in a simulated N deposition study: effects of live plant and soil organic matter content. Plant Soil 351, 61–72 (2012). https://doi.org/10.1007/s11104-011-0929-1
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DOI: https://doi.org/10.1007/s11104-011-0929-1