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Article

Differential Early Performance of Two Underplanted Hardwood Tree Species Following Restoration Treatments in High-Graded Temperate Rainforests

1
Departamento de Ciencias Naturales y Tecnología, Universidad de Aysén, Coyhaique 5950000, Chile
2
Instituto de Bosques y Sociedad, Universidad Austral de Chile, Valdivia 5090000, Chile
3
Centro de Modelación y Monitoreo de Ecosistemas, Universidad Mayor, Santiago 8320000, Chile
4
Laboratorio de Biometría, Universidad de La Frontera, Temuco 4780000, Chile
*
Author to whom correspondence should be addressed.
Forests 2020, 11(4), 401; https://doi.org/10.3390/f11040401
Received: 27 February 2020 / Revised: 24 March 2020 / Accepted: 30 March 2020 / Published: 3 April 2020
(This article belongs to the Special Issue Silviculture for Restoration and Regeneration)
Raulí (Nothofagus alpina (Poepp. & Endl.)) and Ulmo (Eucryphia cordifolia Cav.) are mid-tolerant tree species in the Coihue-Raulí-Tepa (ca. 0.55 mill ha) and Evergreen (ca. 4.1 mill ha) forest types in south-central Chile, respectively. These species have been selectively logged in old-growth forests especially during the 20th century, Raulí mostly for its highly valuable timber, and Ulmo for its highly demanded firewood and bark for the tannery industry. Natural regeneration of these species occurs mostly through canopy gaps, but it can be retarded, or even inhibited, when the cover of the understory vegetation becomes unusually dense, such as in high-graded forests. Although underplanting is possible for these species, the knowledge about their growth in forest understories is scarce, and necessary to inform restoration programs. Therefore, we evaluated short-term responses (two years) of underplanted containerized seedlings in root-collar diameter, height, stem volume, and in the slenderness index, as a function of canopy openness (%, continuous variable) and three restoration treatments (categorical variables, plus one control treatment) at two different sites with high-graded old-growth forests for each forest type. By using generalized linear mixed-effects models (GLMMs) we determined that Raulí was more sensitive to the influence of both canopy openness and restoration treatments, while Ulmo was mostly influenced by canopy openness. Specifically, Raulí was positively influenced by canopy openness and restoration treatments in all response variables except for the slenderness index. Conversely, Ulmo was influenced by canopy openness in all response variables except the slenderness index, which was influenced by both predictor variables (canopy openness and restoration treatments). Thus, prospects for restoration with these species are discussed, including possible ontogenetic changes in their responses to light that may demand continuous silvicultural operations to recover the productive and functional roles of these species in these forest ecosystems. View Full-Text
Keywords: arrested succession; high-graded forests; Eucryphia cordifolia; forest restoration; Nothofagus alpina; underplanted arrested succession; high-graded forests; Eucryphia cordifolia; forest restoration; Nothofagus alpina; underplanted
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MDPI and ACS Style

Soto, D.P.; Donoso, P.J.; Vásquez-Grandón, A.; González-Chang, M.; Salas-Eljatib, C. Differential Early Performance of Two Underplanted Hardwood Tree Species Following Restoration Treatments in High-Graded Temperate Rainforests. Forests 2020, 11, 401. https://doi.org/10.3390/f11040401

AMA Style

Soto DP, Donoso PJ, Vásquez-Grandón A, González-Chang M, Salas-Eljatib C. Differential Early Performance of Two Underplanted Hardwood Tree Species Following Restoration Treatments in High-Graded Temperate Rainforests. Forests. 2020; 11(4):401. https://doi.org/10.3390/f11040401

Chicago/Turabian Style

Soto, Daniel P., Pablo J. Donoso, Angélica Vásquez-Grandón, Mauricio González-Chang, and Christian Salas-Eljatib. 2020. "Differential Early Performance of Two Underplanted Hardwood Tree Species Following Restoration Treatments in High-Graded Temperate Rainforests" Forests 11, no. 4: 401. https://doi.org/10.3390/f11040401

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