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Open AccessArticle

Simulating Araucaria angustifolia (Bertol.) Kuntze Timber Stocks With Liocourt’s Law in a Natural Forest in Southern Brazil

Graduate Program in Forest Engineering, Santa Catarina State University (UDESC), Lages, Santa Catarina 88520-000, Brazil
Department of Forest Engineering, Federal University of Uberlândia (UFU), Monte Carmelo, Minas Gerais 38500-000, Brazil
Graduate Program in Forest Engineering, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul 97105-900, Brazil
Graduate Program in Agroecosystems, Federal University of Technology of Paraná (UTFPR), Dois Vizinhos, Paraná 85660-000, Brazil
Department of Forest Sciences, Federal University of Alagoas (UFAL), Maceió, Alagoas 57072-900, Brazil
Author to whom correspondence should be addressed.
Forests 2020, 11(3), 339;
Received: 28 January 2020 / Revised: 13 March 2020 / Accepted: 15 March 2020 / Published: 18 March 2020
(This article belongs to the Special Issue Silviculture and Management of Mixed-Species Forests)
This paper presents a simulation of the regulation of Araucaria angustifolia (Bertol.) Kuntze timber stocks using Liocourt’s law. Although this species is currently protected by law, recent government initiatives are being considered to propose sustainable forest management practices by selecting small rural properties in Southern Brazil. Here, we simulate the applicability of Liocourt’s law in a typical rural property, the size of which is approximately 85 ha. Forest inventory measurements were conducted by estimating the diameter at the breast height (d), total height (h), and annual diameter increments of 308 trees that fit the criteria of d ≥ 10 cm, distributed on 35 permanent plots of 400 m2 each. As a result, a reverse J-shaped d distribution was found. On average, 303 trees can be found per hectare (ha). Local allometric equations showed their basal area (G) to be 21.9 m2∙ha−1, and their commercial volume (V) to be 172 m3∙ha−1, whereas Liocourt’s quotient (q) was 1.31. Based on these attributes, nine different forest management scenarios were proposed by simulating a remaining basal area (Grem) of 10.0, 14.0, and 18.0 m2∙ha−1, and Liocourt’s quotient was changed to 1.1, 1.3, and 1.5. All scenarios consider a d of 62.5 cm. In the less intensive scenario (i.e., q value = 1.5 and larger basal area of 18.0 m2·ha−1) there is greater optimization of space, and higher economic return is ensured to rural producers due to the definition of shorter cutting cycles. This also allows a faster growth rate in both d and h for smaller trees, due to the higher incidence of light onto the lower canopy layer, increasing the natural regeneration implementation of other native species. Forest management should thus be considered a goal in addition to consumer market characteristics for defining the ideal timber stock scenario. View Full-Text
Keywords: Brazilian pine tree; mixed forest management; forest planning; production Brazilian pine tree; mixed forest management; forest planning; production
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Arnoni Costa, E.; Liesenberg, V.; Felipe Hess, A.; Guimarães Finger, C.A.; Renato Schneider, P.; Villanova Longhi, R.; Schons, C.T.; Adriano Borsoi, G. Simulating Araucaria angustifolia (Bertol.) Kuntze Timber Stocks With Liocourt’s Law in a Natural Forest in Southern Brazil. Forests 2020, 11, 339.

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