INVESTIGADORES
MARTINEZ PASTUR Guillermo Jose
artículos
Título:
Retention forestry in southern Patagonia: Multiple environmental impacts and their temporal trends.
Autor/es:
R SOLER ESTEBAN; S SCHINDLER; MV LENCINAS; PL PERI; G MARTÍNEZ PASTUR
Revista:
INTERNATIONAL FORESTRY REVIEW
Editorial:
COMMONWEALTH FORESTRY ASSOC
Referencias:
Año: 2015 vol. 17 p. 231 - 243
ISSN:
1465-5489
Resumen:
Forests are used for multiple purposes, generating conflicts between harvesting and conservation of natural forests composition. Variable retention harvesting (VR) is a management option aiming to maintainat maintaining the continuity of structural and compositional diversity of managed forests. VR has been applied in Tierra del Fuego since the year 2000, by combining two types of retention: patches of original forest (aggregates), and isolated single homogeneously distributed trees (dispersed retention). In this study, we test the assumption that VR maintain old-growth forests conditions by synthesizing results from long-term field trials in southern Patagonian forests. We assessed (i) forest structure (e.g., debris cover), (ii) microenvironment (e.g., soil temperature at stand level), (iii) biodiversity (e.g., species richness and abundances), and (iv) forest reproduction variables (e.g., number of flowers) in aggregated retention (AR), dispersed retention (DR), and old-growth unmanaged forests (PF). For this purpose, we used 605 individual analysesdifferent results from differentindividual studiescases measured from 1 to 9 years after harvesting, and were contrasting and combining to identifying patterns among the forest treatments. VR has a significant effect (negative trend) on forest structure variables which confirm the structural impact produced by timber extraction. However, neither AR nor DR affected microenvironmental variables compared to PF, although DR showed significantly higher values than AR. On the other hand, VR has a significant effect (positive trend) on biodiversity variables influenced by the increase of understory diversity in harvested stands, while forest reproduction variables were significantly affected (positive trend) by AR compared with PF, but PF did not show differences with DR. We conclude that ecological conditions of N. pumilio forests are influenced by variable retention management. However, the direction and magnitude of the effect depends on the treatment and differs strongly among groups of variable, in example, . At least inside aggregates most of the old-growth components and conditions can partly be maintained along the time.