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Grazing intensity levels influence C reservoirs of wet and mesic meadows along a precipitation gradient in Northern Patagonia

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Abstract

Wet meadows are important ecosystems for forage production and as carbon reservoirs in semi-arid areas. In Patagonia, Argentina, large areas of wet meadows have been classified as overgrazed by livestock. The objective of this study was to determine whether long-term overgrazing has affected carbon (C) storage in plant and soil pools in wet and mesic meadows. The study occurred in Northern Patagonia, in three study sites located along a precipitation gradient. Our results indicate that long-term overgrazing reduced, on average, 35 % of the total ecosystem C pool. There was significantly lower aboveground and belowground plant production in heavily grazed compared to lightly grazed sites, 419 ± 262 – 128 ± 110 g m2 year−1 and 3796 ± 2622 – 1702 ± 1012 g m2 year−1, respectively. Soil C concentrations were also less in heavily grazed sites (184 ± 98 – 105 ± 58 g kg−1 at 1 m depth, respectively). The response of meadows to long-term heavy grazing also appears to be influenced by different levels of precipitation, with sites in drier areas being apparently more susceptible to overgrazing. Our results indicate that new management and restoration practices are needed to stop and reverse meadow deterioration in degraded meadows of Northern Patagonia.

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Acknowledgments

This research was funded by Consejo Nacional de Investigaciones Científicas y Técnicas (CoNICET), and Instituto Nacional de Tecnología Agropecuaria (INTA, through Grant PATNOR-810342. The Ecosystem Science Center at Michigan Technological University partially supported this study. We would like to thank San Ramón Ranch, El Cóndor Ranch, and La Juanita Ranch for the permission to conduct the study. We also thank Dr. S. Varela, and Ing. A. Lavaggi for discussions and/or comments on an earlier version of the manuscript, and to the unknown reviewers, through their comments we highly improved the quality of this manuscript.

Funding

This research was funded by Consejo Nacional de Investigaciones Científicas y Técnicas (CoNICET), and Instituto Nacional de Tecnología Agropecuaria (INTA, through Grant PATNOR-810342. The Ecosystem Science Center at Michigan Technological University partially supported this study.

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  1. CONICET-Área de Recursos Naturales INTA-EEA Bariloche, S.C. De Bariloche, CP R8403DVZ, Río Negro, Argentina

    Andrea Soledad Enriquez & Paula Diehl

  2. School of Forest Resources and Environmental Science, Michigan Technological University, Houghton, USA

    Rodney A. Chimner

  3. INTA, EEA Bordenave, Bordenave, Argentina

    María Victoria Cremona & Griselda Luz Bonvissuto

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  1. Andrea Soledad Enriquez
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  2. Rodney A. Chimner
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  5. Griselda Luz Bonvissuto
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Correspondence to Andrea Soledad Enriquez.

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Enriquez, A.S., Chimner, R.A., Cremona, M.V. et al. Grazing intensity levels influence C reservoirs of wet and mesic meadows along a precipitation gradient in Northern Patagonia. Wetlands Ecol Manage 23, 439–451 (2015). https://doi.org/10.1007/s11273-014-9393-z

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