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<p>Andean cypress <i>(Austrocedrus chilensis)</i> and coihue (<i>Nothofagus dombeyi)</i> grow in potentially wood-productive mixed forests, but the design of forest management schemes is still necessary. These forests have experienced extreme drought, which will be more frequent in the future. This work aimed to evaluate the coihue-Andean cypress mixed forests estimated growth under different forest structures, using LAI (leaf area index) as an occupied growing space indicator, and to evaluate predicted stand growth losses induced by drought events. We fitted LAI-volume periodic annual increment (VPAI) models and applied them to different theoretical LAI arrangements to design target stands. We also simulated 3 drought scenarios and determined the consequences for stand growth for three target stands. If coihue is favored in the upper stratum and Andean cypress in the lower stratum, stand VPAI may be high. Drought losses may result in 40–50% coihue growth reduction. This species could maintain higher production than the Andean cypress even under medium impact. Promoting a balanced species composition, with a slightly greater stocking of coihue in the upper stratum and relegating Andean cypress to the lower stratum, would seem to be a compromise between production and adaptation to extreme drought events.</p>

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Simulations of Growth and Drought-Induced Effects in Andean Cypress-Coihue Mixed Forests

  • 期刊论文

  • 发表日期：

    2025年3月5日

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  • Marina Caselli,
  • María Florencia Urretavizcaya,
  • José Omar Bava,
  • Facundo Heinzle,
  • Helge Walentowski,
  • Gabriel Angel Loguercio

摘要

Andean cypress (Austrocedrus chilensis) and coihue (Nothofagus dombeyi) grow in potentially wood-productive mixed forests, but the design of forest management schemes is still necessary. These forests have experienced extreme drought, which will be more frequent in the future. This work aimed to evaluate the coihue-Andean cypress mixed forests estimated growth under different forest structures, using LAI (leaf area index) as an occupied growing space indicator, and to evaluate predicted stand growth losses induced by drought events. We fitted LAI-volume periodic annual increment (VPAI) models and applied them to different theoretical LAI arrangements to design target stands. We also simulated 3 drought scenarios and determined the consequences for stand growth for three target stands. If coihue is favored in the upper stratum and Andean cypress in the lower stratum, stand VPAI may be high. Drought losses may result in 40–50% coihue growth reduction. This species could maintain higher production than the Andean cypress even under medium impact. Promoting a balanced species composition, with a slightly greater stocking of coihue in the upper stratum and relegating Andean cypress to the lower stratum, would seem to be a compromise between production and adaptation to extreme drought events.