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Subject: SIEMBRA DIRECTA × Author: Quiroz Marchant, Iván ×

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  • Artículo de revista
    The recruitment of the recalcitrant-seeded Cryptocarya alba (Mol.) Looser, established via direct seeding is mainly affected by the seed source and forest cover
    Natural regeneration of recalcitrant-seeded tree species is strongly limited in Mediterraneantype climate zones due to increasing droughts imposed by climate change. Direct seeding can be a low-cost alternative to seedling establishment, but there is still limited information for some species. This study aimed to assess the effects of the seed source and forest cover on the germination and survival of the endemic Cryptocarya alba Mol. established through direct seeding. Three habitat types differing in forest cover were identified within the natural park Reserva Natural Altos de Cantillana, Metropolitan Region, Chile. The forest cover corresponded to open (canopy density <25%), semidense (canopy density around 50%), and dense forest (canopy density >75%). All forest cover had C. alba as one of the dominant species. At each habitat type, 38 families from four seed sources (Cuesta La Dormida (CD), Antumapu (AN), Cantillana (CA, local seed source) and Cayumanque (CY)) were directly seeded. Germination (Germin) and survival (Surv) were evaluated weekly during one growing season. There were significant differences between seed sources in Germin and Surv, with means values varying from 7.8% to 37% for Germin and 0% to 20% for Surv. The local seed source CA had the highest values in both traits. A significant variation was also observed between families within seed sources only for Germin. The dense forest cover had the highest Germin (22%) and Surv (55%) results compared to the other forest cover types, which was partially associated with differences in soil moisture, temperature, and bulk density. Due to the most frequent droughts in these Mediterranean-type climate zones, the use of local seeds on dense forest cover is recommended for the direct seeding of the species in the initial recruitment.
    Magni, Carlos R.-Saavedra, Nicole-Espinoza, Sergio E.-Yañez, Marco A.-Quiroz Marchant, Iván-Faúndez, Angela F.-Grez M., Iván-Martínez, Eduardo E.
    Región Metropolitana de Santiago
    2022
  • Artículo de revista
    Aprovisionamiento y análisis de semillas de Hualo para su uso en proyecto FIBN 002/2018: siembra directa: técnica de recuperación de bosques nativos de Roble y Hualo
    Se evalúa el efecto del remojo por 24 horas en ácido giberélico (0, 50, 100, 200 y 400 ppm) sobre la germinación de semillas de hualo (Nothofagus glauca) de dos localidades de la región del Maule (Quivolgo y Empedrado). En ambos casos la germinación de los tratamientos es significativamente superior a la del testigo, obteniéndose la mejor germinación con la mayor concentración de ácido giberélico. En Empedrado se logra una germinación máxima de 26,7% y en Quivolgo 9,3% atribuyéndose la diferencia a la calidad de cada lote de semillas. En efecto la semilla de Quivolgo es de menor tamaño (3.243 sem/kg contra 1.924 sem/kg de Empedrado) y con mayor incidencia de perforaciones que afectan su viabilidad
    Gutiérrez Caro, Braulio-Quiroz Marchant, Iván-Koch Z., Laura
    2019