Plant and Soil

, Volume 409, Issue 1–2, pp 99–116 | Cite as

Stabilization of new carbon inputs rather than old carbon decomposition determines soil organic carbon shifts following woody or herbaceous vegetation transitions

  • Roxana P. Eclesia
  • Esteban G. Jobbagy
  • Robert B. Jackson
  • Marcos Rizzotto
  • Gervasio Piñeiro
Regular Article


Background and aims

Although numerous studies have quantified the effects of land-use changes on soil organic carbon (SOC) stocks, few have examined simultaneously the weight of carbon (C) inputs vs. outputs in shaping these changes. We quantified the relative importance of soil C inputs and outputs in determining SOC changes following the conversion of natural ecosystems to pastures or tree plantations, and evaluated them in light of variations in biomass production, its quality (C:N) and above/belowground allocation patterns.


We sampled soils up to one-meter depth under native grasslands or forests and compared them to adjacent sites with pastures or plantations to estimate the proportion of new SOC (SOCnew) retained in the soil and the decomposition rates of old SOC (k SOC-old ) based on δ 13C shifts. We also analyzed these changes in the particulate organic matter fraction (POM) and estimated above and belowground net primary production (ANPP and BNPP) from satellite images, as well as changes in vegetation and soil’s C:N ratios.


The conversion of grasslands to tree plantations decreased total SOC contents while the conversion of forests to pastures increased SOC contents in the topsoil but decreased them in deep layers, maintaining similar soil stocks up to 1 m. Changes in POM were less important and occurred only in the topsoil after cultivating pastures, following SOC changes. Surprisingly, both land-use trajectories showed similar decomposition rates in the topsoil and therefore overall SOC changes were not correlated with C outputs (k SOC-old ) but were significantly correlated with C inputs and their stabilization as SOCnew (similar results were obtained for the POM fraction). Pastures although decreased ANPP (as compared to forest) they increased belowground allocation and C:N ratios of their inputs to the soil, probably favoring the retention and stabilization of their new C inputs. In contrast, tree plantations increased ANPP but decreased BNPP (as compared to grasslands) and scarcely accumulated SOCnew probably as a result of the high C retention in standing biomass.


Our results suggest that SOC changes are mainly controlled by the quantity and quality of C inputs and their retention in the soil, rather than by C outputs in these perennial subtropical ecosystems.


Soil organic carbon Decomposition rate Roots Lands use change 



We would like to thank Luís Colconvet, Martín Pinazzo, Norberto Pahr, Santiago Lacorte, Hernan Dieguez, CamiloBagnato, Daniel Castillo, Lucía Romero, Alberto Sosa, Hugo Reis (PINDO S.A.), Ricardo Vilm, Carlos Navajas, Horacio Beltramino, HampelHorman and Carlos Vera (DANZER S.A.) for allowing and collaborating in our field work. We thank to Pablo Baldassini for their support in image processing. This research was partially funded by FONCYT (PICT 2199 and PICT 06-1764), UBACYT (0835 and 20020090200128), CONICET (PIP 555) and by a grant from the Inter-American Institute for Global Change Research (IAI, CRN 3095), which is supported by the US National Science Foundation (Grant GEO-1128040). Roxana Paola Eclesia was supported by a master degree scholarship from INTA.


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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  • Roxana P. Eclesia
    • 1
  • Esteban G. Jobbagy
    • 2
  • Robert B. Jackson
    • 3
  • Marcos Rizzotto
    • 2
  • Gervasio Piñeiro
    • 4
    • 5
  1. 1.Estación Experimental Agropecuaria INTA ParanáParanáArgentina
  2. 2.Grupo de Estudios Ambientales, IMASLUniversidad Nacional de San Luis, CONICETSan LuisArgentina
  3. 3.School of Earth Sciences, Woods Institute for the Environment and Precourt Institute for EnergyStanford UniversityStanfordUSA
  4. 4.IFEVA/Facultad de AgronomíaUniversidad de Buenos Aires/CONICETBuenos AiresArgentina
  5. 5.Departamento de Sistemas Ambientales, Facultad de AgronomíaUniversidad de la RepúblicaMontevideoUruguay

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