Resumen
The alpine páramo of Chingaza National Park, Colombia, has a highly variable cloud regime typical of many tropical alpine areas. Yet, little information is available regarding the effects of such dynamic sunlight regimes on alpine temperatures. A close association between changes in incident sunlight and corresponding air (Ta) and leaf (Tl) temperatures occurred in two dominant species with strongly contrasting leaf form and whole-plant architecture. Spikes in sunlight incidence of >3000 μmol m-2 s-1 occurred during cloud cover and corresponded to increases in Tl of 4-5 °C in a 1-min-interval in both species. Although Tl was predominately above Ta, during the day, depressions below Ta of over 6 °C occurred during cloudy conditions when photosynthetic photon flux density (PFDs) was <400 μmol m-2 s-1. The greatest frequency (69%) of changes in incident sunlight (PFDs; over 2-min intervals) was less than 100 μmol m-2 s-1, although changes >1000 μmol m-2 s-1 occurred for 2.4% of the day, including a maximum change of 1512 μmol m-2 s-1. These data may be valuable for predicting the ecophysiological impact of climate warming and associated changes in future cloud regimes experienced by tropical alpine species.
Idioma original | Inglés estadounidense |
---|---|
Páginas (desde-hasta) | 371-378 |
Número de páginas | 8 |
Publicación | Arctic, Antarctic, and Alpine Research |
Volumen | 46 |
N.º | 2 |
DOI | |
Estado | Publicada - may. 1 2014 |
Áreas temáticas de ASJC Scopus
- Cambio global y planetario
- Ecología, evolución, comportamiento y sistemática
- Procesos de la superficie terrestre