Growth, demography and carbon relations of Polylepis trees at the world's highest treeline

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Growth and carbon relations of tree line forming conifers at constant vs. variable low temperatures (2009, background): “…declines drastically over a very short altitudinal distance, tissues generally accumulate increasing concentrations of nonstructural carbon compounds (e.g. starch, low molecular weight sugars and neutral lipids; Hoch et al. 2002; Hoch & Körner 2003, 2005; Piper et al. 2006; Shi et al. 2006, 2008).”
A test of the growth-limitation theory for alpine tree line formation in evergreen and deciduous taxa of the eastern Himalayas (2008, background): “…carbon does not appear to be a limiting resource at tree line in these Himalayan test sites, matching observations from other tree lines (Hoch et al. 2002; Hoch & Körner 2003; Shi et al. 2006; Piper et al. 2006), including the highest elevation Polylepis-trees in the Andes (Hoch & Körner 2005).”
The performance of Polylepis australis trees along their entire altitudinal range: implications of climate change for their conservation (2008, background): “Low temperatures were also found to reduce CO2 assimilation of Polylepis sericea (Arteaga, 2002) and to inhibit tissue growth of Polylepis tarapacana, leading to smaller tree ring widths towards its upper distribution limit (Hoch & Körner, 2005).”