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Annals of Forest Science

, 76:86 | Cite as

Long-term loblolly pine land use reduces methane and net greenhouse gas emissions in a subtropical Cambisol, despite increasing nitrous oxide

  • Murilo G. Veloso
  • Jeferson DieckowEmail author
  • Josiléia Acordi Zanatta
  • Maico Pergher
  • Cimélio Bayer
  • Rosana C. V. Higa
Research Paper
  • 14 Downloads

Abstract

Key message

In loblolly pine land use of 17–32 years following forest clearing, CH 4 consumption and N 2 O emission diminished by 17 years, due to high soil moisture (~ 80% WFPS, N 2 O into N 2 ), but increased by 32 years, where medium moisture favoured methanotrophy and denitrification into N 2 O. Soil greenhouse gases (GHG) emission was positive by 17 years, but negative by 32, when soil sequestered carbon.

Context

Much of the role of planted forests in the gaseous soil-atmosphere exchanges in the subtropics remains to be evaluated.

Aims

To assess the impacts of loblolly pine (Pinus taeda L.) on soil nitrous oxide (N2O) and methane (CH4) fluxes in a subtropical Cambisol.

Methods

Fluxes were monitored over 1 year with static chambers, in forest stands under natural forest (NF) and pine plantation for 17 (P17) and 32 years (P32).

Results

The NF soil showed the lowest N2O emission and the highest CH4 consumption, because of the lowest water-filled pore space (WFPS, < 40%) and highest soil macroporosity. In P17, N2O emission was still low, but CH4 consumption diminished sixfold, possibly because of the predominance of methanotrophy, favoured by the highest WFPS (~ 80%) and lowest macroporosity that together with low mineral N concentration also did not favour the formation of N2O. In P32, the improved soil mineral N, macroporosity and intermediate WFPS (~ 60%) increased CH4 consumption and also N2O emission, in an environment supposedly favourable to methanotrophy and also to N2O production. Considering soil organic carbon (SOC) from a concurrent study, the net GHG emission (Mg Ceq ha−1 year−1) was 2.8 in P17 and − 1.1 in P32.

Conclusion

Soil under pine plantation is the source of GHG in the first rotation (17 years), because of the low CH4 consumption and SOC losses, but soil becomes C sink in the second rotation (32 years), by sequestering SOC and consuming more CH4, despite emitting more N2O.

Keywords

Reforestation GHG intensity Ammonium Nitrate Temperature Southern Brazil 

Notes

Acknowledgements

The authors appreciate the helpful contribution of Modo Battistella Reflorestamento, for granting access to the forest stands, and of the field and laboratory staff of Embrapa and UFPR.

Funding

This study was financially supported by Saltus Project (Macroprograma 1 Grandes Desafios Nacionais - Embrapa) and by CNPq (Brazilian Scientific Council). Scholarships were funded by Capes (Brazilian Ministry of Education) and by CNPq.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© INRA and Springer-Verlag France SAS, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Departamento de Solos e Engenharia Agrícola e Programa de Pós-Graduação em Ciência do SoloUniversidade Federal do ParanáCuritibaBrazil
  2. 2.Embrapa FlorestasColomboBrazil
  3. 3.Departamento de SolosUniversidade Federal do Rio Grande do SulPorto AlegreBrazil

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