Biogeochemistry

, Volume 133, Issue 3, pp 279–294 | Cite as

Distinct fates of atmogenic NH4 + and NO3 in subtropical, N-saturated forest soils

  • Longfei Yu
  • Ronghua Kang
  • Jan Mulder
  • Jing Zhu
  • Peter Dörsch
Article

Abstract

Subtropical forests receive increasing amounts of atmogenic nitrogen (N), both as ammonium (NH4 +) and nitrate (NO3 ). Previous long-term studies indicate efficient turnover of atmogenic NH4 + to NO3 in weathered, acidic soils of the subtropics, leading to excessive NO3 leaching. To clarify the mechanism governing the fate of atmogenic inputs in these soils, we conducted an in situ 15N tracing experiment in the TieShanPing (TSP) forested catchment, SW China. 15NH4NO3, NH 4 15 NO3 and 15N-glutamic acid were applied to an upland hillslope soil and inorganic N, total soil N and nitrous oxide (N2O) were monitored for nine days. Incorporation of 15NO3 into soil organic N was negligible and 80% of the applied label was lost from the top soil (0–15 cm) primarily by leaching within 9 days. In contrast, 15NH4 + was largely retained in soil organic N. However, instant production of 15NO3 in the 15NH4 + treatment suggested active nitrification. In both the 15NH4 + and 15N-glutamic acid treatments, the 15N enrichment in the NO3 pool exceeded that in the NH4 + pool one day after 15N application, suggesting preferential nitrification of added 15NH4 + with subsequent dilution of the NH4 + pool and/or immobilization of 15NH4 + followed by heterotrophic nitrification. The cumulative recovery of 15N in N2O after 9 days ranged from 2.5 to 6.0% in the 15NO3 treatment, confirming the previously reported significant response of N2O emission to N deposition. Source partitioning of 15N2O demonstrated a measurable contribution of nitrification to N2O emissions, particularly at low soil moistures. Our study emphasizes the role of a fast-cycling organic N pool (including microbial N) for retention and transformation of atmogenic NH4 + in subtropical, acid forest soils. Thus, it explains the near-quantitative leaching of deposited N (as NO3 and NH4 +) common to subtropical forest soils with chronic, elevated atmogenic N inputs by (i) negligible retention of NO3 in the soil and (ii) rapid immobilization-mineralization of NH4 + followed by nitrification. Our findings point to a leaky N cycle in N-saturated Chinese subtropical forests with consequences for regional soil acidification, N pollution of fresh waters and N2O emission.

Keywords

N deposition 15N tracer Gross N transformation Nitrification Denitrification Nitrate leaching N2O emission 

Notes

Acknowledgements

LY thanks the China Scholarship Council (CSC) for supporting his Ph.D. study. Support from the Norwegian Research Council to project 209696/E10 ‘Forest in South China: an important sink for reactive nitrogen and a regional hotspot for N2O?’ is gratefully acknowledged. We thank Prof. Duan Lei, Dr. Wang Yihao, Wang Jiaqi, Zhang Ting, Yang Hanyue, Wu Liping, Kai Xuan and Zou Mingquan for their help with the data collection throughout the field experiment.

Supplementary material

10533_2017_332_MOESM1_ESM.docx (4.9 mb)
Supplementary material 1 (DOCX 4984 kb)

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Copyright information

© Springer International Publishing Switzerland 2017

Authors and Affiliations

  • Longfei Yu
    • 1
  • Ronghua Kang
    • 1
  • Jan Mulder
    • 1
  • Jing Zhu
    • 1
    • 2
  • Peter Dörsch
    • 1
  1. 1.Faculty of Environmental Sciences and Natural Resource ManagementNorwegian University of Life SciencesAasNorway
  2. 2.Department of Environment and ResourcesGuangxi Normal UniversityGuilinChina

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