Lake fluctuations, plant productivity, and long-term variability in high-elevation tropical andean ecosystems

CARILLA, J; GRAU, H R; PAOLINI L; MORALES MS

ARCTIC ANTARCTIC AND ALPINE RESEARCH

INST ARCTIC ALPINE RES

Lugar: Boulder, USA; Año: 2013 vol. 45 p. 179 - 189

1523-0430

Environmental trends and ecosystems´ ranges of variability are little known in tropical very high elevation Andean ecosystems (above 4400 masl). We combined satellite image analyses and dendrochronological methods with instrumental records at lower elevation to assess changes in lake size and indices of plant productivity of subtropical high-elevation ecosystems in northern Argentina and southern Bolivia. Between 1985 and 2009, interannual lake fluctuations assessed with Landsat images were positively correlated with inter-annual variations in regional precipitation and de Martonne’s aridity index, showing a decreasing trend in moisture availability during the period. Changes in lake size were positively correlated with radial growth of Polylepis tarapacana, and with MODIS-derived phenological parameters of EVI (an index of vegetation “greenness”) between 2001 – 2010. This indicates that water balance has a significant effect on ecosystem functioning, which is related to regional scale atmospheric circulation. A long term tree ring chronology (starting in 1750) showed that tree growth during recent decades was lower than the last 180 years; and were comparable to growth patterns occurred between 1775 and 1825. These results suggest that if current climatic trends continue, long term ranges of variability in ecosystem functioning could be exceeded.