Person: Primicia Alvarez, Irantzu
Loading...
Email Address
person.page.identifierURI
Birth Date
Research Projects
Organizational Units
Job Title
Last Name
Primicia Alvarez
First Name
Irantzu
person.page.departamento
Ciencias del Medio Natural
person.page.instituteName
ORCID
0000-0003-2909-5579
person.page.upna
9207
Name
5 results
Search Results
Now showing 1 - 5 of 5
Publication Open Access Linkages between climate, seasonal wood formation and mycorrhizal mushroom yields(Elsevier, 2016) Primicia Alvarez, Irantzu; Camarero, Jesús Julio; Martínez de Aragón, Juan; Miguel, Sergio de; Bonet, José Antonio; Ciencias del Medio Natural; Natura Ingurunearen ZientziakFungi provide important forest ecosystem services worldwide. In Mediterranean pine forests, predicted warmer and drier conditions could lead to a decline in mushroom yields. Climate is a key factor regulating both tree growth and fungal yields, particularly in drought-prone Mediterranean ecosystems. However, the responses of forest growth and mushroom production to climate depend on the differences among tree and fungal species and functional groups (e.g., mycorrhizal vs. saprotrophic), forest types, as well as depending on site conditions. Here we investigate how climatic conditions drive seasonal wood formation (earlywood −EW− and latewood −LW− production) and mycorrhizal mushroom production, to disentangle if growth and fungal yields are related. This assessment was done in Mediterranean forests dominated by four pine species in two areas located in Catalonia (NE Spain) representing mesic and xeric conditions and encompassing wide ecological gradients. The data consisted of 7-year to 13-year long inventories of mushroom production. EW production was favoured by cold and wet climate conditions during the previous fall and winter, and during the current spring and summer. LW production was enhanced by warm and humid conditions from spring to early fall. Mushroom yield was improved by wet late-summer and fall conditions, mainly in the most xeric area. This study confirms the ample differences found in tree growth and fungal production along ecological and climatic gradients. Clear relationships between mycorrhizal fungal yields and tree growth were mostly observed in specific sites characterized by severe summer drought. Specifically, latewood production seems to be the tree-ring variable most tightly linked to mycorrhizal fungal yield in drought-prone areas.Publication Open Access Temporal interactions among throughfall, type of canopy and thinning drive radial growth in an Iberian mixed pine-beech forest(Elsevier, 2018) Cardil Forradellas, Adrián; Imbert Rodríguez, Bosco; Camarero, Jesús Julio; Primicia Alvarez, Irantzu; Castillo Martínez, Federico; Ciencias del Medio Natural; Natura Ingurunearen ZientziakMany factors can influence tree growth over time such as different forest management practices, climate or tree-to-tree interactions, especially in mixed forests. We show in this work how the temporal growth patterns for Scots pine and European beech depend on thinning intensity (0%, 20% and 40% extraction of basal area), canopy type (pine-beech vs. pine patches), throughfall and their interactions. To fulfill this objective we monitored radial growth of both species using band dendrometers during a 6-year long period including two very dry years. Temporal growth patterns differed between both species. Whereas Scots pine showed two main peaks of growth in May-June and October, European beech mainly grew from May to early September even when throughfall was very limited. Effects of thinning on growth generally increased for both species during dry periods both at the seasonal and annual scales. The treatment with 20% of thinning intensity was the most effective at the annual scale for enhancing growth of both species. However, increases in growth due to thinning were much higher in beech than in pine and lasted longer. Thinning effects on pine were higher in mixed canopy than in pure canopy and appeared to be modulated by throughfall. Global differences in pine growth between canopy types as a function of throughfall increased during the main growing season as beech canopy developed. Growth of Scots pine, but not that of European beech, generally increased with throughfall which suggests that pine might be more dependent for its growth on water from the soil surface layer while beech would depend more on water from deeper soil layers. Our findings have implications to select the most convenient thinning treatments and canopy type under a potential climate change scenario characterized by warmer conditions, more severe droughts and less throughfall.Publication Open Access Influencia de la intensidad de clara y tipo de dosel en el ciclo interno de nutrientes y el crecimiento secundario de pino silvestre en un bosque mixto de los Pirineos occidentales: noticia de tesis(Asociación Española de Ecología Terrestre, 2013) Primicia Alvarez, Irantzu; Ciencias del Medio Natural; Natura Ingurunearen ZientziakDebido a sus múltiples beneficios se ha recomendado la conversión de bosques puros de coníferas en bosques mixtos en zonas potencialmente sensibles a cambios climáticos y medioambientales. En este trabajo se analiza la influencia de la intensidad de clara a medio plazo (8-9 años tras la clara) y el tipo de dosel sobre el crecimiento secundario de pino silvestre y el ciclo de nutrientes (cambios químicos en suelo, retranslocación, y trascolación). El estudio forma parte de una investigación a largo plazo sobre el funcionamiento del bosque y la sostenibilidad de las claras forestales desde una perspectiva ecológica. El área de estudio está localizada en Aspurz, Navarra, en los Pirineos occidentales.Publication Open Access Influence of thinning intensity and canopy type on Scots pine stand and growth dynamics in a mixed managed forest(Instituto Nacional de Investigacion y Tecnologia Agraria y Alimentaria (INIA), 2016) Primicia Alvarez, Irantzu; Artázcoz, Rubén; Imbert Rodríguez, Bosco; Puertas, Fernando; Traver, Carmen; Castillo Martínez, Federico; Ciencias del Medio Natural; Natura Ingurunearen ZientziakAim of the study: We analysed the effects of thinning intensity and canopy type on Scots pine growth and stand dynamics in a mixed Scots pine-beech forest. Area of the study: Western Pyrenees. Material and methods: Three thinning intensities were applied in 1999 (0, 20 and 30% basal area removed) and 2009 (0, 20 and 40%) on 9 plots. Within each plot, pure pine and mixed pine-beech patches are distinguished. All pine trees were inventoried in 1999, 2009 and 2014. The effects of treatments on the tree and stand structure variables (density, basal area, stand and tree volume), on the periodic annual increment in basal area and stand and tree volume, and on mortality rates, were analysed using linear mixed effects models. Main Results: The enhancement of tree growth was mainly noticeable after the second thinning. Growth rates following thinning were similar or higher in the moderate than in the severe thinning. Periodic stand volume annual increments were higher in the thinned than in the unthinned plots, but no differences were observed between the thinned treatments. We observed an increase in the differences of the Tree volume annual increment between canopy types (mixed < pure) over time in the unthinned plots, as beech crowns developed. Research highlights: Moderate thinning is suggested as an appropriate forest practice at early pine age in these mixed forests, since it produced higher tree growth rates than the severe thinning and it counteracted the negative effect of beech on pine growth observed in the unthinned plots.Publication Embargo Estudio de los procesos de decaimiento en abies alba mill en los hayedo-abetales navarros mediante técnicas de teledetección(2022) Primicia Alvarez, Irantzu; Álvarez Mozos, Jesús; Escuela Técnica Superior de Ingeniería Agronómica y Biociencias; Nekazaritzako Ingeniaritzako eta Biozientzietako Goi Mailako Eskola TeknikoaExisten evidencias de procesos de decaimiento en numerosos sistemas forestales relacionados con una reducción de la disponibilidad hídrica. Es el caso del abeto en el Pirineo occidental, donde se espera que estos procesos se intensifiquen ante un escenario de cambio climático. El objetivo de este trabajo es analizar el potencial del uso de imágenes satelitales adquiridas por el sensor Sentinel-2 en la detección de abetos afectados por decaimiento en el hayedo-abetal situado en el Monte Irati (Pirineos occidentales). Para ello, se analizó la respuesta de diversos índices de vegetación a nivel intra e inter anual, los cuales permitieron discriminar las zonas con presencia de abetos en declive. Red Edge Normalized Difference Vegetation Index (RENDVI) y Green Normalized Vegetation Index (GNDVI) fueron los índices que proporcionaron mejores resultados. Este estudio pone de manifiesto el potencial del análisis de imágenes satelitales para el estudio de procesos de decaimiento en los ecosistemas forestales.