Open Access
Influencia de las claras forestales en los restos leñosos de pino silvestre en un bosque mixto en Aspurz:un enfoque de volumen, biomasa y hábitat de invertebrados
(2015) Herrera Álvarez, Ximena; Blanco Vaca, Juan Antonio; Escuela Técnica Superior de Ingenieros Agrónomos; Nekazaritza Ingeniarien Goi Mailako Eskola Teknikoa
En esta investigación se pretende conocer si la gestión forestal con distintas intensidades de clara (0%, 20% y 40%) influyen en los restos leñosos de un pinar –hayedo de Aspurz (Navarra nor-oriental). Por esta razón se realizaron transectos en línea para conocer el volumen, biomasa y las clases de descomposición presentes de restos leñosos. Adicionalmente, se tomaron muestras de restos leñosos de las clases de descomposición más avanzadas para conocer la comunidad de invertebrados presentes de acuerdo a la intensidad de clara, tipo de dosel (Pinus sylvetris y Fagus sylvatica) y el estadío de descomposición. Los resultados encontrados indicaron que el volumen y biomasa estuvieron influidos significativamente por las claras forestales, así como las clases de descomposición presentes de forma mayoritaria fueron las clases de descomposición intermedias. En los resultados de invertebrados se registraron 19 taxones, siendo los más abundantes los ácaros oribátidos, otros ácaros, ácaros inmaduros y colémbolos. La intensidad de clara no influyó significativamente en todos los taxones, pero el tipo de dosel y la clase de descomposición sí influyeron significativamente en los taxones más abundantes. Estos resultados tuvieron relación con la mayor radiación de luz directa en Pinus sylvestris en comparación a Fagus sylvatica, así como el contenido hídrico de las muestras de restos leñosos. Mis resultados de volumen de restos leñosos indicaron que en las parcelas de 40% de eliminación de área basal de árboles no alcanzan el valor mínimo necesario para la conservación de las especies saproxílicas, lo cual debería ser tomado en cuenta como una recomendación en la gestión forestal.
Open Access
Coarse woody debris' invertebrate community is affected directly by canopy type and indirectly by thinning in mixed scots pine-European beech forests
(MDPI, 2020) Herrera Álvarez, Ximena; Blanco Vaca, Juan Antonio; Imbert Rodríguez, Bosco; Álvarez, Willin; Rivadeneira Barba, Gabriela; Zientziak; Institute for Multidisciplinary Research in Applied Biology - IMAB; Ciencias
Research Highlights: Thinning and tree species alter the forest floor microclimate by modifying canopy cover, radiation, wind, and humidity. Thus, forest management can directly influence the edaphic mesofauna responsible for decomposing coarse woody debris (CWD). Background and Objectives: This research was carried out in the Southwestern Pyrenees Mountains (Northern Spain) and aimed to determine the influence of forest thinning and canopy type (pure Pinus sylvestris L. or a mix of P. sylvestris and Fagus sylvatica L.) on CWD colonization by edaphic fauna. Materials and Methods: CWD samples were collected belonging to intermediate and advanced decomposition stages, approximately 10 cm long and 5 cm in diameter. Using a design of three thinning intensities (0%, 20%, and 40% of basal area removed), with three replications per treatment (nine plots in total), four samples were taken per plot (two per canopy type) to reach 36 samples in total. Meso- and macrofauna were extracted from CWD samples with Berlese-Tullgren funnels, and individuals were counted and identified. Results: 19 taxonomic groups were recorded, the most abundant being the mesofauna (mites and Collembola). Mixed canopy type had a significant positive influence on richness, whereas advanced decay class had a positive significant influence on total abundance and richness. In addition, there were non-significant decreasing trends in richness and abundance with increasing thinning intensity. However, interactions among thinning intensity, canopy type, and decay class significantly affected mesofauna. Furthermore, some taxonomic groups showed differential responses to canopy type. CWD water content was positively correlated with total invertebrate abundance and some taxonomic groups. Our results suggest that stand composition has the potential to directly affect invertebrate communities in CWD, whereas stand density influence is indirect and mostly realized through changes in CWD moisture. As mesofauna is related to CWD decomposition rates, these effects should be accounted for when planning forest management transition from pure to mixed forests.
Open Access
Invertebrate community of Scots pine coarse woody debris in the Southwestern Pyrenees under different thinning intensities and tree species
(MDPI, 2021) Herrera Álvarez, Ximena; Blanco Vaca, Juan Antonio; Imbert Rodríguez, Bosco; Álvarez, Willin; Rivadeneira Barba, Gabriela; Zientziak; Institute for Multidisciplinary Research in Applied Biology - IMAB; Ciencias
Background and Objectives: The forest in the Southwestern Pyrenees Mountains (Northern Spain) is mainly composed of pure Pinus sylvestris L. or a mix of P. sylvestris and Fagus sylvatica L. The most common forest management technique to harvest pine is the application of forest thinning with different intensities. It promotes a change in the forest composition and structure. Taking into consideration this region as a site specific research about this topic, we aimed to understand the CWD invertebrate composition response to different thinning intensities and canopy type of these tree species. Materials and Methods: CWD samples were collected belonging to intermediate and advanced decay classes, approximately 10 cm long and 5 cm in diameter. Using a design of three thinning intensities (0%, 20%, and 40% of basal area removed), with three replications per treatment (nine plots in total), four samples were taken per plot (two per canopy type) to reach 36 samples in total. Meso- and macrofauna were extracted from CWD samples with Berlese– Tullgren funnels, and individuals were counted and identified. Results: Most of the taxonomic groups belonged to mesofauna, mainly to Acari and Collembola orders. On the other hand, the macrofauna represented a minimum percentage of the community composition. Our results indicated that although thinning intensities did not significantly affect the invertebrate community, canopy type and CWD water content influenced significantly. It is imperative to consider in forest management the responses of canopy type and thinning intensities in CWD water content, this disturbance could also slow down the organic matter decomposition process in the soil, thus affecting in the long term the natural cycle of nutrients.

Herrera Álvarez, Ximena

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