Ecological traits of the tropical treeline species Polylepis quadrijuga (Rosaceae) in the Andes of Colombia

azote bosques chemical composition composition chimique crecimiento croissance fenologia feuille fisiologia vegetal flavonoide flavonoides flavonoids fleur flores flowers forest litter forests growth hojarasca forestal hojas leaves longevidad longevity nitrogen phenology plant physiology precipitation rosaceae seasonal variation temperatura temperature translocation