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Soil microbial processes in a pine silvopastoral system in NW Patagonia

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Abstract

The conversion of native vegetation to tree plantation (afforestation) implies a drastic change in life forms and as a consequence, changes in the microenvironmental conditions, and the quantity and quality of organic matter entering the soil. This could affect soil microbial communities and the processes catalyzed by them. In Patagonia, afforestation with exotic, fast-growing tree species was a common practice but the consequences on the ecosystem remain poorly quantified. The objective was to study the effects of pine afforestation on litter decomposition, soil organic matter, soil microbial activity and associated biogeochemical functions in a semiarid area of NW Patagonia. We hypothesized that afforestation would decrease litter decomposition rate and soil biological activity including net N mineralization, due to changes of environmental conditions and organic matter quality. We measured in situ and potential soil net N mineralization, soil microbial biomass-C, soil enzyme activities (β-glucosidase, acid phosphatase and leucin-aminopeptidase) and litter decomposition rate. We also characterized soil pH, electrical conductivity, extractable P and total C and N. Pine plantations clearly affected decomposition rates of native grass vegetation, which was 10% lower under pine canopy cover, and decreased soil microbial biomass. Acid phosphatase activity and leucin-aminopeptidase activities were also marginally reduced. On the other hand, we did not find any significant effects of pines on soil chemical properties and N transformations after 13 years of plantation. Because effects depend strongly on time, the decrease of soil microbial biomass, acid phosphatase activity and grass decomposition rate (and the trend to lower enzyme activities related to P and N) under pine cover could be an evidence of possible changes on the long-term.

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Acknowledgements

This work was supported by Proyecto de Manejo Sustentable de Recursos Naturales Componentes II: “Plantaciones forestales Sustentables” BIRF No 7520, Programa Silvopastoril Módulos Experimentales con Fines Demostrativos. We thank the Estancia Los Peucos for study site facilitation.

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Authors and Affiliations

  1. INIBIOMA, CONICET-Universidad Nacional del Comahue, Quintral 1250, CP 8400, Bariloche, Argentina

    Marina Gonzalez-Polo & María Julia Mazzarino

  2. Instituto Nacional de Tecnología Agropecuaria (INTA), cc277, CP 8400, Bariloche, Río Negro, Argentina

    Clara Fariña & Gonzalo Caballé

  3. Instituto Nacional de Tecnología Agropecuaria (INTA), cc 332, CP 9400, Río Gallegos, Santa Cruz, Argentina

    Héctor A. Bahamonde & Pablo L. Peri

  4. Universidad Nacional de la Patagonia Austral (UNPA), Lisandro de la Torre 1070, CP 9400, Río Gallegos, Argentina

    Héctor A. Bahamonde & Pablo L. Peri

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  1. Marina Gonzalez-Polo
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  2. Héctor A. Bahamonde
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  3. Pablo L. Peri
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  4. María Julia Mazzarino
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  5. Clara Fariña
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  6. Gonzalo Caballé
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Correspondence to Marina Gonzalez-Polo.

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Gonzalez-Polo, M., Bahamonde, H.A., Peri, P.L. et al. Soil microbial processes in a pine silvopastoral system in NW Patagonia. Agroforest Syst 93, 255–266 (2019). https://doi.org/10.1007/s10457-018-0210-1

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