Polylepis Forest Ecosystems and Biodiversity Conservation

Polylepis forests occupy some of the highest treelines on earth, forming patchy woodlands across the high Andes and acting as critical microrefugia for a suite of specialised plants and animals. These ecosystems exhibit remarkable adaptations to cold, wind and poor soils, with many Polylepis species displaying stunted or shrubby life forms at extreme elevations. Their fragmented distribution harbours high levels of endemism and supports unique avifauna and invertebrate assemblages. Beyond biodiversity values, Polylepis woodlands deliver key ecosystem services – including water regulation, soil stabilisation and carbon storage – to downstream communities. Yet they face multiple threats: overgrazing, fire, timber extraction and climate change have reduced their extent to a fraction of historical cover. Conservation efforts now seek to integrate ecological knowledge with land-use planning, restoration practice and community engagement to secure both biodiversity and the vital services these high-elevation forests provide.

Research from Nature Portfolio

Systematic planning approaches have been employed to reconcile biodiversity objectives with ecosystem service delivery in high-Andean protected areas. In one study, zoning models were used to balance conservation of Polylepis woodlands and associated bird species with water-related services, revealing both synergies and unexpected trade-offs such as increased soil erosion under scenarios prioritising forest protection. Another investigation into pristine high-Andean relict ecosystems provided baseline data from formerly undisturbed Polylepis stands, showing up to ten times greater forest biomass than in human-affected sites and altered patterns of soil carbon storage. These findings challenge prevailing notions of naturalness in Andean landscapes and underscore the importance of reference conditions when planning restoration and management strategies.

Polylepis Forest Ecosystems and Biodiversity Conservation publication trend

The graph below shows the total number of articles in polylepis forest ecosystems and biodiversity conservation across all publications each year (not limited to Nature Index journals).

Technical terms

Polylepis forests: High-elevation woodlands dominated by evergreen trees of the genus Polylepis, adapted to cold, windy Andean environments.

Treeline: The upper altitudinal limit at which trees can grow; beyond this line, environmental conditions prevent forest establishment.

Endemic species: Organisms restricted to a particular geographic region, often with limited distributions and specialised habitat requirements.

Ecosystem services: Benefits provided by natural systems to people, including water regulation, carbon storage, soil protection and cultural values.

Systematic conservation planning: A structured approach that identifies priority areas and actions to achieve biodiversity and ecosystem service objectives under resource constraints.

References

1. Characterization of Polylepis tarapacana Life Forms in the Highest-Elevation Altiplano in South America: Influence of the Topography, Climate and Human Uses. Plants (2023).
2. Relict high-Andean ecosystems challenge our concepts of naturalness and human impact. Scientific Reports (2017).
3. Identifying trade-offs between biodiversity conservation and ecosystem services delivery for land-use decisions. Scientific Reports (2020).
4. A monograph of the genus Polylepis (Rosaceae). PhytoKeys (2022).
5. Avian community structure and habitat use of Polylepis forests along an elevation gradient. PeerJ (2017).