Influencia de las características edafoclimáticas en el desarrollo y propiedades del hongo comestible Morchella spp. de la zona centro-sur de Chile
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Date
2026
Journal Title
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Volume Title
Publisher
Universidad de Concepción
Abstract
La fructificación natural de Morchella spp. constituye un fenómeno ecológico altamente variable y aun insuficientemente explicado, particularmente en ecosistemas templados del hemisferio sur. Considerando que la ocurrencia de este hongo comestible responde a la interacción jerárquica entre condiciones edáficas, climáticas, estructurales y de perturbación, en este estudio se planteó como hipótesis que el desarrollo, la calidad nutricional y composición mineral de Morchella spp. son afectados por las características edafoclimáticas de los sitios donde fructifica en forma natural.
En este contexto, el objetivo general fue evaluar la relación existente entre Morchella spp. y las características edafoclimáticas de los hábitats donde fructifica de manera natural, determinando el impacto potencial de estas propiedades en la calidad del recurso fúngico. Para ello, se desarrolló un estudio en cuatro sitios representativos (36°50′–37°50′ S), que incluyeron plantaciones forestales afectadas por disturbios severos (incendio forestal y cosecha mecanizada) y relictos de bosque nativo estructuralmente estables, establecidos sobre suelos de origen granítico y volcánico.
A escala de paisaje y micrositio, se caracterizaron variables climáticas mensuales durante una ventana temporal de 25 meses centrada en el evento de fructificación, junto con propiedades físicas, químicas y biológicas del suelo, y atributos estructurales de la vegetación. Los datos fueron integrados mediante enfoques multivariados, principalmente análisis de componentes principales (PCA), con el fin de identificar gradientes ambientales asociados a la presencia y ausencia de fructificación, así como diferencias entre ambientes y especies.
Los resultados demostraron que la fructificación de Morchella spp. ocurre de manera consistente dentro de una ventana climática acotada, caracterizada por temperaturas moderadas del suelo, incremento de la precipitación acumulada y alta humedad relativa, confirmando el rol de la sincronización climática como gatillante del evento reproductivo. En contraste, las propiedades edáficas presentaron una amplia superposición funcional entre sitios con y sin fructificación, sin una separación multivariada consistente, lo que respalda la hipótesis de que el suelo actúa como un marco ambiental predisponente, pero no como un factor determinante de la ocurrencia anual del evento.
A escala de micrositio, el régimen de perturbación y la estructura de la vegetación emergieron como factores clave en la diferenciación de los ambientes de fructificación, condicionando la ocurrencia y composición específica de Morchella. Los ambientes severamente perturbados se asociaron a especies oportunistas de fructificación temprana (M. eximia y M. importuna), mientras que los bosques nativos estructuralmente estables favorecieron especies de fructificación tardía (M. tridentina y M. andinensis), en concordancia con los objetivos específicos planteados.
Finalmente, el análisis de atributos de calidad de los cuerpos de fructificación, incluyendo composición proximal, contenido mineral, compuestos fenólicos y actividad antioxidante, evidenció diferencias consistentes entre especies y tipos de cobertura forestal, cumpliendo el objetivo de evaluar cómo el ambiente de fructificación influye en la calidad nutricional y funcional del recurso.
Los resultados validan la hipótesis planteada y permiten proponer un modelo conceptual integrado en el que el suelo y el clima definen la idoneidad ambiental de base, el disturbio modula la ocurrencia y diversidad específica, y la sincronización climática desencadena la fructificación de Morchella spp. Esta investigación aporta evidencia relevante sobre la ecología de Morchella spp. en ecosistemas templados de Sudamérica y establece una base científica para su manejo sustentable y conservación como recurso forestal no maderero.
The natural fruiting of Morchella spp. is a highly variable and still insufficiently explained ecological phenomenon, particularly in temperate ecosystems in the southern hemisphere. Considering that the occurrence of this edible fungus responds to the hierarchical interaction between edaphic, climatic, structural, and disturbance conditions, this study hypothesized that the development, nutritional quality, and mineral composition of Morchella spp. are affected by the edaphic and climatic characteristics of the sites where it fruits naturally. In this context, the overall objective was to evaluate the relationship between Morchella spp. and the edaphoclimatic characteristics of the habitats where it naturally fruits, determining the potential impact of these properties on the quality of the fungal resource. To this end, a study was conducted at four representative sites (36°50′–37°50′ S), which included forest plantations affected by severe disturbances (forest fire and mechanized harvesting) and structurally stable remnants of native forest, established on soils of granitic and volcanic origin. At both landscape and microsite scales, monthly climatic variables were characterized over a 25-month temporal window centered on the fructification event, together with the physical, chemical, and biological properties of the soil, as well as structural attributes of the vegetation. The data were integrated using multivariate approaches, primarily principal component analysis (PCA), in order to identify environmental gradients associated with the presence and absence of fructification, as well as differences among environments and species. The results demonstrated that Morchella spp. fructification occurs consistently within a restricted climatic window characterized by moderate soil temperatures, increased cumulative precipitation, and high relative humidity, confirming the role of climatic synchronization as the trigger of the reproductive event. In contrast, edaphic properties exhibited a broad functional overlap between sites with and without fructification, without a consistent multivariate separation, supporting the hypothesis that soil acts as a predisposing environmental framework rather than as a determining factor for the annual occurrence of fructification. At the microsite scale, disturbance regime and vegetation structure emerged as key factors differentiating fruiting environments, conditioning both the occurrence and species composition of Morchella. Severely disturbed environments were associated with early-fruiting opportunistic species (M. eximia and M. importuna), whereas structurally stable native forests favored late-fruiting species (M. tridentina and M. andinensis), in agreement with the specific objectives proposed. Finally, the analysis of ascocarp quality traits, including proximate composition, mineral content, phenolic compounds, and antioxidant activity, revealed consistent differences among species and forest cover types, fulfilling the objective of evaluating how the fruiting environment influences the nutritional and functional quality of the resource. Overall, the results validate the proposed hypothesis and support an integrated conceptual model in which soil and climate define baseline environmental suitability, disturbance modulates species occurrence and diversity, and climatic synchronization triggers the fructification of Morchella spp. This research provides relevant ecological evidence on Morchella spp. in temperate ecosystems of South America and establishes a scientific basis for its sustainable management and conservation as a non-timber forest resource.
The natural fruiting of Morchella spp. is a highly variable and still insufficiently explained ecological phenomenon, particularly in temperate ecosystems in the southern hemisphere. Considering that the occurrence of this edible fungus responds to the hierarchical interaction between edaphic, climatic, structural, and disturbance conditions, this study hypothesized that the development, nutritional quality, and mineral composition of Morchella spp. are affected by the edaphic and climatic characteristics of the sites where it fruits naturally. In this context, the overall objective was to evaluate the relationship between Morchella spp. and the edaphoclimatic characteristics of the habitats where it naturally fruits, determining the potential impact of these properties on the quality of the fungal resource. To this end, a study was conducted at four representative sites (36°50′–37°50′ S), which included forest plantations affected by severe disturbances (forest fire and mechanized harvesting) and structurally stable remnants of native forest, established on soils of granitic and volcanic origin. At both landscape and microsite scales, monthly climatic variables were characterized over a 25-month temporal window centered on the fructification event, together with the physical, chemical, and biological properties of the soil, as well as structural attributes of the vegetation. The data were integrated using multivariate approaches, primarily principal component analysis (PCA), in order to identify environmental gradients associated with the presence and absence of fructification, as well as differences among environments and species. The results demonstrated that Morchella spp. fructification occurs consistently within a restricted climatic window characterized by moderate soil temperatures, increased cumulative precipitation, and high relative humidity, confirming the role of climatic synchronization as the trigger of the reproductive event. In contrast, edaphic properties exhibited a broad functional overlap between sites with and without fructification, without a consistent multivariate separation, supporting the hypothesis that soil acts as a predisposing environmental framework rather than as a determining factor for the annual occurrence of fructification. At the microsite scale, disturbance regime and vegetation structure emerged as key factors differentiating fruiting environments, conditioning both the occurrence and species composition of Morchella. Severely disturbed environments were associated with early-fruiting opportunistic species (M. eximia and M. importuna), whereas structurally stable native forests favored late-fruiting species (M. tridentina and M. andinensis), in agreement with the specific objectives proposed. Finally, the analysis of ascocarp quality traits, including proximate composition, mineral content, phenolic compounds, and antioxidant activity, revealed consistent differences among species and forest cover types, fulfilling the objective of evaluating how the fruiting environment influences the nutritional and functional quality of the resource. Overall, the results validate the proposed hypothesis and support an integrated conceptual model in which soil and climate define baseline environmental suitability, disturbance modulates species occurrence and diversity, and climatic synchronization triggers the fructification of Morchella spp. This research provides relevant ecological evidence on Morchella spp. in temperate ecosystems of South America and establishes a scientific basis for its sustainable management and conservation as a non-timber forest resource.
Description
Tesis presentada para optar al grado de Magíster en Ciencias Agronómicas
Keywords
Hongos comestibles -- Chile, Edafología -- Chile, Hongos -- Cultivos y medios de cultivo