Vertical patterns of epiphytic bryophyte diversity in a montane Nothofagus forest in the Chilean Andes

2017 ◽  
Vol 55 (4) ◽  
pp. 514-529 ◽  
Author(s):  
Daniela Mellado-Mansilla ◽  
Carolina A. León ◽  
Gabriel Ortega-Solís ◽  
Javier Godoy-Güinao ◽  
Ricardo Moreno ◽  
...  
Keyword(s):  
Nothofagus Forest ◽  
Chilean Andes

Changes in alveolar and arterial gas tensions as related to altitude and age

1964 ◽  
Vol 19 (1) ◽  
pp. 21-24 ◽  
Author(s):  
James W. Terman ◽  
Jerry L. Newton
Keyword(s):  
High Altitude ◽  
Pulmonary Ventilation ◽  
Research Station ◽  
Age Changes ◽  
Altitude Acclimatization ◽  
Ventilation Perfusion Ratio ◽  
Early Phases ◽  
Chilean Andes

In the summer of 1962 at the White Mountain Research Station the early phases of altitude acclimatization were studied in six of the surviving eight members of the 1935 expedition to the Chilean Andes; they were from 58 to 71 years of age. Alveolar and arterial Po2 and Pco2 were determined for each man a few hours after arrival at 3,093 m and at 3,800 and 4,343 m over the next few days. The effects of age were superimposed on the classical responses to high altitude. The arterial and alveolar Pco2 values showed no significant gradient; the alveolar Pco2 was found to be lower for a given altitude than 27 years before. For example, their average alveolar Pco2 at 4,700 m in 1935 was 27.7 mm Hg as opposed to 25.1 mm Hg at 4,343 m in 1962. The case of Hall was exceptional: his alveolar Pco2 ranged from 21 to 24 mm Hg regardless of altitude for his sojourn of 22 days. In 1935 these six men had a mean A-a Po2 gradient of +3.0 mm Hg at 4,700 m, while in 1962 the gradient over the three altitudes was +12.4 mm Hg. These findings would likely be explained partially by age changes in the pulmonary ventilation-perfusion ratio. acclimatization; pulmonary ventilation-perfusion ratio; alveolar-arterial Po2 and Pco2 gradients; alveolar hyperventilation; aging and altitude Submitted on February 19, 1963

scholarly journals Quaternary Glaciations in the Andes of North-Central Chile

1975 ◽  
Vol 14 (70) ◽  
pp. 155-170 ◽  
Author(s):  
Cesar N. Caviedes ◽  
Roland Paskoff
Keyword(s):  
Polar Front ◽  
Southern Andes ◽  
North Central ◽  
Central Chile ◽  
The Andes ◽  
Semi Arid ◽  
Quaternary Glaciations ◽  
Chilean Andes

The extension of the Quaternary glaciations has been studied in the semi-arid Andes of north-central Chile, where the glacial modelling is striking. In the Elqui valley (lat. 30°S.), two glacial advances were identified reaching down to 3 100 m (Laguna glaciation) and 2 500 m (Tapado glaciation). In the Aconcagua valley (lat. 33°S.), moraines from three major glacial advances were found, at 2 800 m (Portillo glaciation), 1 600 m (Guardia Vieja glaciation) and 1 300 m (Salto del Soldado glaciation).The Quaternary glaciations were linked with a decrease of temperature, but more significantly with a marked increase of precipitation probably related to an equatorward shift of 5–6 degrees of the austral polar front. The results obtained in the semi-arid Chilean Andes are correlated with those recently reported from other sectors of the southern Andes.

Paleozoic terranes of the central Argentine-Chilean Andes

Tectonics ◽  
1986 ◽  
Vol 5 (6) ◽  
pp. 855-880 ◽  
Author(s):  
V. A. Ramos ◽  
T. E. Jordan ◽  
R. W. Allmendinger ◽  
C. Mpodozis ◽  
S. M. Kay ◽  
...  
Keyword(s):  
Chilean Andes

scholarly journals A magnetotelluric study in the southern Chilean Andes

2001 ◽  
Vol 28 (19) ◽  
pp. 3757-3760 ◽  
Author(s):  
Heinrich Brasse ◽  
Wolfgang Soyer
Keyword(s):  
Chilean Andes

Climate-resilient water supply for a mine in the Chilean Andes

2018 ◽  
Vol 171 (4) ◽  
pp. 203-215 ◽  
Author(s):  
Rodrigo Correa-Ibanez ◽  
Greg Keir ◽  
Neil McIntyre
Keyword(s):  
Water Supply ◽  
Chilean Andes

Nitrogen storage and availability during stand development in a New Zealand Nothofagus forest

2002 ◽  
Vol 32 (2) ◽  
pp. 344-352 ◽  
Author(s):  
P W Clinton ◽  
R B Allen ◽  
M R Davis
Keyword(s):  
New Zealand ◽  
Forest Floor ◽  
Woody Debris ◽  
Mineral Soil ◽  
Stand Development ◽  
N Availability ◽  
Net N Mineralization ◽  
Nitrogen Storage ◽  
Nothofagus Forest ◽  
Mature Stands

Stemwood production, N pools, and N availability were determined in even-aged (10, 25, 120, and >150-year-old) stands of a monospecific mountain beech (Nothofagus solandri var. cliffortioides (Hook. f.) Poole) forest in New Zealand recovering from catastrophic canopy disturbance brought about by windthrow. Nitrogen was redistributed among stemwood biomass, coarse woody debris (CWD), the forest floor, and mineral soil following disturbance. The quantity of N in stemwood biomass increased from less than 1 kg/ha in seedling stands (10 years old) to ca. 500 kg/ha in pole stands (120 years old), but decreased in mature stands (>150 years old). In contrast, the quantity of N stored in CWD declined rapidly with stand development. Although the mass of N stored in the forest floor was greatest in the pole stands and least in the mature stands, N availability in the forest floor did not vary greatly with stand development. The mass of N in the mineral soil (0–100 mm depth) was also similar for all stands. Foliar N concentrations, net N mineralization, and mineralizable N in the mineral soil (0–100 mm depth) showed similar patterns with stage of stand development, and indicated that N availability was greater in sapling (25 years old) and mature stands than in seedling and pole stands. We conclude that declining productivity in older stands is associated more with reductions in cation availability, especially calcium, than N availability.

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