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<p>The success of tree regeneration following silvicultural interventions depends on its interaction with landscape-scale disturbances. In the mixed <i>Nothofagus</i> forests of northwestern Patagonia (Argentina), this study evaluates how site conditions modulate the recruitment in response to the combined effects of silvicultural management and the mass die-off of <i>Chusquea culeou</i>. We quantified the density, composition, age, height, and mortality of total tree regeneration (diameter at breast height &lt; 10&#xa0;cm) of <i>Nothofagus dombeyi</i>, <i>N. alpina</i>, and <i>N. obliqua</i> (Nothofagaceae) in managed and unmanaged forests located in West (2200&#xa0;mm yr<sup>− 1</sup> mean precipitation), Middle (1800&#xa0;mm yr<sup>− 1</sup>), and East (1400&#xa0;mm yr<sup>− 1</sup>) sites. In the West and Middle sites, disturbances acted as compound disturbances, showed higher regeneration density and height in managed compared to unmanaged forest. Segmented regression revealed a regeneration pulse occurring between 2001 and 2017, after <i>C. culeou</i> die-off. In the East site, where <i>C. culeou</i> is naturally sparse, regeneration showed delayed establishment and no mortality. Regeneration of the more light-demanding <i>N. dombeyi</i> and <i>N. obliqua</i> was negatively correlated with <i>C. culeou</i> cover, whereas regeneration of the more shade-tolerant <i>N. alpina</i> declined under high canopy openness. Regarding the density of established regeneration (height &gt; 2&#xa0;m), the effect of <i>C. culeou</i> on <i>N. dombeyi</i> became positive when canopy openness &gt; 40%, while the effect on <i>N. alpina</i> was negative when openness &lt; 15%. These results underscore the critical role of disturbance interactions in creating temporal windows of opportunity for <i>Nothofagus</i> regeneration and highlight their implications for ecosystem resilience.</p>

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Silviculture and Chusquea culeou die-off drive Nothofagus regeneration across a precipitation gradient in subantarctic mixed forests

  • 期刊论文

  • 发表日期：

    2026年6月3日

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  • Camila Mateo,
  • Alejandro Dezzotti,
  • Verónica El Mujtar,
  • Paula Marchelli,
  • Fabio Trinco,
  • Franco Floriani,
  • Marcelo González Peñalba,
  • Renato Sbrancia,
  • Georgina Sola

摘要

The success of tree regeneration following silvicultural interventions depends on its interaction with landscape-scale disturbances. In the mixed Nothofagus forests of northwestern Patagonia (Argentina), this study evaluates how site conditions modulate the recruitment in response to the combined effects of silvicultural management and the mass die-off of Chusquea culeou. We quantified the density, composition, age, height, and mortality of total tree regeneration (diameter at breast height < 10 cm) of Nothofagus dombeyi, N. alpina, and N. obliqua (Nothofagaceae) in managed and unmanaged forests located in West (2200 mm yr− 1 mean precipitation), Middle (1800 mm yr− 1), and East (1400 mm yr− 1) sites. In the West and Middle sites, disturbances acted as compound disturbances, showed higher regeneration density and height in managed compared to unmanaged forest. Segmented regression revealed a regeneration pulse occurring between 2001 and 2017, after C. culeou die-off. In the East site, where C. culeou is naturally sparse, regeneration showed delayed establishment and no mortality. Regeneration of the more light-demanding N. dombeyi and N. obliqua was negatively correlated with C. culeou cover, whereas regeneration of the more shade-tolerant N. alpina declined under high canopy openness. Regarding the density of established regeneration (height > 2 m), the effect of C. culeou on N. dombeyi became positive when canopy openness > 40%, while the effect on N. alpina was negative when openness < 15%. These results underscore the critical role of disturbance interactions in creating temporal windows of opportunity for Nothofagus regeneration and highlight their implications for ecosystem resilience.