TY - JOUR

T1 - Forest regrowth in Tierra del Fuego, southern Patagonia

T2 - landscape drivers and effects on forest structure, soil, and understory attributes

AU - Soler, Rosina

AU - Lencinas, María Vanessa

AU - Martínez Pastur, Guillermo

AU - Rosas, Micaela Yamina

AU - Bustamante, Gimena

AU - Espelta, Josep Maria

N1 - Funding Information: This study was supported by the projects PICT-2019–00675 ANPCyT-Argentina and PUE-2016 CONICET-Argentina. RS was supported by CONICET (National Scientific and Technical Research Council—Argentina) through an External Scholarship for Young Researchers. Funding Information: We would like to thank the technicians, students, and rancher owners who collaborated in the data collection in the field. The aerial photographs were provided by the Secretaria de Ambiente , Desarrollo Sustentable y Cambio Clim?tico of the province of Tierra del Fuego and INTA-AER, Ushuaia. RS and JME thank Caterin Sandoval for her assistance in image analysis , and Joan Pino for his recommendations in the GIS-based analysis. Publisher Copyright: © 2022, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.

PY - 2022

Y1 - 2022

N2 - The influence of the ancient landscape configuration and the land use legacies on forest cover change has been thoroughly investigated in temperate and tropical forests while it remains barely explored at high-latitudinal regions. This study explores the landscape drivers leading forest cover changes and their influence on current forest attributes in the world’s southernmost forests (Argentina). Nothofagus antarctica forest cover changes were determined by combining multitemporal photo-interpretation of aerial photographs (1961) and satellite images (2016–2019). We analyzed changes in land covers and landscape diversity indexes. We also explored the potential relationships among descriptors of forest structure, soil or understory characteristics, and the magnitude of forest increase. Forest cover increased in 55 sites (72% of study area), and decreased in 21 sites (28% of study area). Cleared forests and forest edges decreased by half from past to the present, while woody encroachment increased. This resulted in a diversification of the current landscape by an increase in the number of land cover categories and Shannon–Wiener index. The increase in forest cover was positively influenced by land cover diversity and latitude, i.e., major increases at southern latitudes. Forests with greater recovery presented more similar understory attributes than those with lower recovery, while in other forest structures and soil properties, different magnitudes of recovery occurred. Sites with a high proportion of forest recovery evidence a reduction of past land use legacies (e.g., forage plant species introduced for livestock) at a local scale. These results expand our knowledge about the current natural dynamic of high-latitude forests, although the precise anthropic pressure changes (e.g., livestock density) leading to this process are still unclear and should be further investigated. Management practices should consider these spatial differences in the response to recovery of sub-Antarctic forests, such as the management of densely regenerated areas by thinning, or the restoration of degraded forests, as well as the monitoring of woody encroachment in natural grasslands and peatlands. Although we document an overall gain in N. antarctica forests, the results could vary when incorporating other forest types (N. pumilio, N. betuloides) and geographic zones (e.g., Andean mountains), due to the complex dynamics of these coupled human-natural systems.

AB - The influence of the ancient landscape configuration and the land use legacies on forest cover change has been thoroughly investigated in temperate and tropical forests while it remains barely explored at high-latitudinal regions. This study explores the landscape drivers leading forest cover changes and their influence on current forest attributes in the world’s southernmost forests (Argentina). Nothofagus antarctica forest cover changes were determined by combining multitemporal photo-interpretation of aerial photographs (1961) and satellite images (2016–2019). We analyzed changes in land covers and landscape diversity indexes. We also explored the potential relationships among descriptors of forest structure, soil or understory characteristics, and the magnitude of forest increase. Forest cover increased in 55 sites (72% of study area), and decreased in 21 sites (28% of study area). Cleared forests and forest edges decreased by half from past to the present, while woody encroachment increased. This resulted in a diversification of the current landscape by an increase in the number of land cover categories and Shannon–Wiener index. The increase in forest cover was positively influenced by land cover diversity and latitude, i.e., major increases at southern latitudes. Forests with greater recovery presented more similar understory attributes than those with lower recovery, while in other forest structures and soil properties, different magnitudes of recovery occurred. Sites with a high proportion of forest recovery evidence a reduction of past land use legacies (e.g., forage plant species introduced for livestock) at a local scale. These results expand our knowledge about the current natural dynamic of high-latitude forests, although the precise anthropic pressure changes (e.g., livestock density) leading to this process are still unclear and should be further investigated. Management practices should consider these spatial differences in the response to recovery of sub-Antarctic forests, such as the management of densely regenerated areas by thinning, or the restoration of degraded forests, as well as the monitoring of woody encroachment in natural grasslands and peatlands. Although we document an overall gain in N. antarctica forests, the results could vary when incorporating other forest types (N. pumilio, N. betuloides) and geographic zones (e.g., Andean mountains), due to the complex dynamics of these coupled human-natural systems.

KW - Disturbance regimes

KW - Forest expansion

KW - Land use legacies

KW - Nothofagus antarctica

KW - Secondary forests

U2 - 10.1007/s10113-022-01910-6

DO - 10.1007/s10113-022-01910-6

M3 - Journal article

AN - SCOPUS:85126765556

VL - 22

JO - Regional Environmental Change

JF - Regional Environmental Change

SN - 1436-3798

M1 - 46

ER -