Recovery of understory assemblage along 50 years after shelterwood cut harvesting in Nothofagus pumilio Southern Patagonian forests

2019 ◽  
Vol 450 ◽  
pp. 117494 ◽  
Author(s):  
Magalí Pérez Flores ◽  
Guillermo Martínez Pastur ◽  
Juan Manuel Cellini ◽  
María Vanessa Lencinas
Keyword(s):  
Nothofagus Pumilio ◽  
Shelterwood Cut

Rehabilitation of Nothofagus pumilio forests in Chilean Patagonia: can fencing and planting season effectively protect against exotic European hare browsing?

New Forests ◽  
2021 ◽  
Author(s):  
Alejandro Huertas Herrera ◽  
Álvaro Promis ◽  
Mónica Toro-Manríquez ◽  
María Vanessa Lencinas ◽  
Guillermo Martínez Pastur ◽  
...  
Keyword(s):  
Nothofagus Pumilio ◽  
European Hare ◽  
Chilean Patagonia ◽  
Planting Season

Richness and Density of Birds in Timber Nothofagus pumilio Forests and their Unproductive Associated Environments

2005 ◽  
Vol 14 (10) ◽  
pp. 2299-2320 ◽  
Author(s):  
María Vanessa Lencinas ◽  
Guillermo Martínez Pastur ◽  
Marlin Medina ◽  
Carlos Busso
Keyword(s):  
Nothofagus Pumilio

The trade-off between cold resistance and growth determines the Nothofagus pumilio treeline

Plant Ecology ◽  
2011 ◽  
Vol 213 (1) ◽  
pp. 133-142 ◽  
Author(s):  
Marco A. Molina-Montenegro ◽  
Jorge Gallardo-Cerda ◽  
T. S. M. Flores ◽  
Cristian Atala
Keyword(s):  
Cold Resistance ◽  
Nothofagus Pumilio ◽  
Trade Off

Changes in nutrient and fibre tissue contents in Nothofagus pumilio trees growing at site quality and crown class gradients

2022 ◽  
Vol 505 ◽  
pp. 119910
Author(s):  
Jimena E. Chaves ◽  
María V. Lencinas ◽  
Juan M. Cellini ◽  
Pablo L. Peri ◽  
Guillermo J. Martínez Pastur
Keyword(s):  
Site Quality ◽  
Nothofagus Pumilio ◽  
Tissue Contents

Four Centuries of Summer Temperature Changes in Tierra Del Fuego: Atmospheric Drivers and Tree-Ring Reconstruction From the Southernmost Forests of the World

2021 ◽  
Author(s):  
Vladimir Matskovsky ◽  
Fidel A. Roig ◽  
Mauricio Fuentes ◽  
Irina Korneva ◽  
Diego Araneo ◽  
...  
Keyword(s):  
Tree Ring ◽  
Ring Width ◽  
Temperature Reconstruction ◽  
Summer Temperature ◽  
Temperature Variability ◽  
Tierra Del Fuego ◽  
Climate Modelling ◽  
Least Squares Regression ◽  
Nothofagus Pumilio ◽  
The World

Abstract Proxy climate records, such as those derived from tree rings, are necessary to extend relatively short instrumental meteorological observations into the past. Tierra del Fuego is the most austral territory with forests in the world, situated close to the Antarctic Peninsula, which makes this region especially interesting for paleoclimatic research. However, high-quality, high-resolution summer temperature reconstruction are lacking in the region. In this study we used 63 tree-ring width chronologies of Nothofagus pumilio and Nothofagus betuloides and partial least squares regression (PLSR) to produce annually resolved December-to-February temperature reconstruction since AD 1600 which explains up to 65% of instrumental temperature variability. We also found that observed summer temperature variability in Tierra del Fuego is primarily driven by the fluctuations of atmospheric pressure systems both in the South Atlantic and South Pacific, while it is insignificantly correlated to major hemispheric modes: ENSO and SAM. This fact makes our reconstruction important for climate modelling experiments, as it represents specific regional variability. Our reconstruction can be used for direct comparison with model outputs to better understand model limitations or to tune a model or contribute to larger scale reconstructions based on paleoclimatic data assimilation. Moreover, we showed that PLSR has improved performance over principal component regression (PCR) in the case of multiple tree-ring predictors. According to these results, PLSR may be a preferable method over PCR for the use in automated tree-ring based reconstruction approaches, akin widely used point-by-point regression.

Ecology of cultivable yeasts in pristine forests in northern Patagonia (Argentina) influenced by different environmental factors

2014 ◽  
Vol 60 (6) ◽  
pp. 371-382 ◽  
Author(s):  
María Cecilia Mestre ◽  
Sonia Fontenla ◽  
Carlos A. Rosa
Keyword(s):  
Environmental Factors ◽  
Volcanic Activity ◽  
Forest Site ◽  
Nothofagus Pumilio ◽  
Species Accumulation Curves ◽  
Environmental Characteristics ◽  
Factors Affecting ◽  
Complex Interactions ◽  
Forest Sites ◽  
Nothofagus Antarctica

Environmental factors influencing the occurrence and community structure of soil yeasts in forests are not well studied. There are few studies dedicated to Southern Hemisphere soil yeasts populations and even fewer focused on temperate forests influenced by volcanic activity. The present work aimed to study the ecology of soil yeast communities from pristine forests influenced by different environmental factors (precipitation, physicochemical properties of soil, tree species, soil region, and season). The survey was performed in 4 northern Patagonian forests: 2 dominated by Nothofagus pumilio and 2 by Nothofagus antarctica. Yeast communities were described with ecological indices and species accumulation curves, and their association with environmental characteristics was assessed using multivariate analysis. Each forest site showed a particular arrangement of species as a result of environmental characteristics, such as dominant plant species, nutrient availability, and climatic characteristics. Cryptococcus podzolicus was most frequently isolated in nutrient-rich soils, Trichosporon porosum dominated cold mountain forests with low nutrient and water availability in soil, and capsulated yeasts such as Cryptococcus phenolicus dominated forest sites with low precipitation. The present work suggests that environmental factors affecting yeast communities may not be the current soil characteristics but the result of complex interactions of factors including natural disturbances like volcanic activity.

scholarly journals Modelling tree ring cellulose <i>δ</i><sup>18</sup>O variations in two temperature-sensitive tree species from North and South America

2017 ◽  
Vol 13 (11) ◽  
pp. 1515-1526 ◽  
Author(s):  
Aliénor Lavergne ◽  
Fabio Gennaretti ◽  
Camille Risi ◽  
Valérie Daux ◽  
Etienne Boucher ◽  
...  
Keyword(s):  
South America ◽  
Isotopic Fractionation ◽  
Circulation Model ◽  
Effect Of Temperature ◽  
Temperature Sensitive ◽  
Nothofagus Pumilio ◽  
Climate Signal ◽  
North And South America ◽  
North And South ◽  
Two Temperature

Abstract. Oxygen isotopes in tree rings (δ18OTR) are widely used to reconstruct past climates. However, the complexity of climatic and biological processes controlling isotopic fractionation is not yet fully understood. Here, we use the MAIDENiso model to decipher the variability in δ18OTR of two temperature-sensitive species of relevant palaeoclimatological interest (Picea mariana and Nothofagus pumilio) and growing at cold high latitudes in North and South America. In this first modelling study on δ18OTR values in both northeastern Canada (53.86° N) and western Argentina (41.10° S), we specifically aim at (1) evaluating the predictive skill of MAIDENiso to simulate δ18OTR values, (2) identifying the physical processes controlling δ18OTR by mechanistic modelling and (3) defining the origin of the temperature signal recorded in the two species. Although the linear regression models used here to predict daily δ18O of precipitation (δ18OP) may need to be improved in the future, the resulting daily δ18OP values adequately reproduce observed (from weather stations) and simulated (by global circulation model) δ18OP series. The δ18OTR values of the two species are correctly simulated using the δ18OP estimation as MAIDENiso input, although some offset in mean δ18OTR levels is observed for the South American site. For both species, the variability in δ18OTR series is primarily linked to the effect of temperature on isotopic enrichment of the leaf water. We show that MAIDENiso is a powerful tool for investigating isotopic fractionation processes but that the lack of a denser isotope-enabled monitoring network recording oxygen fractionation in the soil–vegetation–atmosphere compartments limits our capacity to decipher the processes at play. This study proves that the eco-physiological modelling of δ18OTR values is necessary to interpret the recorded climate signal more reliably.

scholarly journals HISTORIA DEL BOSQUE EN EL CENTRO DE TIERRA DEL FUEGO, ARGENTINA

2019 ◽  
Vol 2 (3) ◽  
pp. 25-36
Author(s):  
Lidia S. Burry ◽  
Matilde E. Trivi de Mandri
Keyword(s):  
Tierra Del Fuego ◽  
Nothofagus Pumilio

Nothofagus pumilio es la especie forestal nativa de mayor importancia en Tierra del Fuego ocupa un área de 214,000 ha, y es la principal fuente de madera. En este trabajo se aportan elementos para la reconstrucción de la historia del bosque de Nothofagus pumilio en el centro de la Isla Grande de Tierra del Fuego, extremo austral del continente americano. La reconstrucción se realizó mediante el análisis polínico de tres segmentos de una columna de sedimentos, proveniente de una turbera de Sphagnum. Los granos de polen se extrajeron con técnicas físicas y químicas; se determinaron, contaron y los datos porcentuales se trataron estadísticamente mediante un análisis de ordenación, para lo cual se usó el análisis de correspondencia (CA programme). Los cambios del contenido polínico a lo largo del perfil muestran variaciones de los parámetros ambientales durante el Holoceno, en relación con el cambio de estepa a bosque. Se demuestra que en el centro de la Isla entre ca 6,800 y 7,775±205 años AP hubo una estepa de gramíneas, que se transformó en un bosque abierto entre 2,340±35 y 2,755±45 años AP, y a partir de 1,725±35 años AP se desarrolló el bosque cerrado, presente en la actualidad. Se supone que estas variaciones se relacionan con el aumento en la precipitación. Las asincronías en el establecimiento del bosque en otros sitios de Tierra del Fuego se deben al gradiente de humedad de los vientos del sureste.

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