Seleção de procedências e progênies de Araucaria angustifolia (Bert.) O. Kuntze para produção de madeira e pinhão

Silva, Janaína Rodrigues da; Santos, Wanderley dos; Moraes, Mário Luiz Teixeira de; Shimizu, J. Y.; Sousa, V. A. de; Aguiar, A. V. de

doi:10.18671/scifor.v46n120.01

Cited by 7 publications

(8 citation statements)

References 10 publications

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“…years beyond the values given bySchneider et al (1992), indicating that this site delivered an impressive production even beyond those authors' best stands. Recent results of A. angustifolia genetic breeding started in the 1970s by EMBRAPA are now delivering promising perspectives(Silva et al 2018; Sousa and Aguiar 2012), which will probably be the genetic base of a new plantation wave. Nevertheless, this new enhanced genetic material will only deliver its maximum potential if accompanied by a deeper understanding of site quality.…”

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Soil biotic and abiotic traits as driven factors for site quality of Araucaria angustifolia plantations

et al. 2022

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Purpose: The role of soil biotic and abiotic factors in crucial ecosystem services such as primary production, organic matter dynamics, nutrient cycling, and soil biota community structure in the Araucaria ecosystem remains poorly quanti ed. We aimed to understand how the site quality affects the development of organic horizons, root growth, soil chemical properties, and the entire soil biota community in even aged and monospeci c Araucaria angustifolia plantations.Methods: We collected soil monoliths to describe layers of organic matter and the complex soil food web into these layers. We determined soil pH, soil moisture, total nitrogen, available P, and total organic carbon into each layer (litter, F-layer, H-layer, and A horizon), the biomass of ne roots, the community structure of soil biota, arbuscular mycorrhizal fungi, and nematodes, as well as the microbial biomass carbon.Results: In the high-quality site, there was signi cantly higher organic matter formation, nutrient cycling (N and P), root growth, soil moisture, soil biota diversity, arbuscular mycorrhizal fungi, nematodes, and microbial activity evaluated by the microbial biomass carbon compared to the low-quality site.Conclusions: High-quality sites promote the development of organic horizons, root growth on super cial layers that provide plant nutrient release, the A horizon nutrient contents, and the entire soil biota community in monospeci c Araucaria angustifolia plantations located on humid subtropical Cambisols. This creates a positive plant-soil feedback that maintains soil quality and increases primary production, nutrient cycling, and habitat and food for the soil food web.

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confidence: 99%

Soil biotic and abiotic traits as driven factors for site quality of Araucaria angustifolia plantations

et al. 2022

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“…On the other hand, the studied highproductivity site had a dominant height at age of 30 years beyond the values given by Schneider et al (1992), indicating that this site delivered an impressive production even beyond those authors' best stands. Recent results of A. angustifolia genetic breeding started in the 1970s by EMBRAPA are now delivering promising perspectives (Silva et al 2018;Sousa and Aguiar 2012), which will probably be the genetic base of a new plantation wave. Nevertheless, this new enhanced genetic material will only deliver its maximum potential if accompanied by a deeper understanding of site quality.…”

Section: Discussionmentioning

confidence: 99%

Soil biotic and abiotic characteristics as driven factors for site quality of Araucaria angustifolia plantations

Souza

Dobner

Schmitt

et al. 2021

Preprint

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Purpose The role of soil biotic and abiotic factors in crucial ecosystem services such as primary production, organic matter dynamics, nutrient cycling, and soil biota community structure in the Araucaria ecosystem remains poorly quantified. We aimed to quantify the role of site quality on the development of organic horizons, root growth, soil chemical properties, and the entire soil biota community in even-aged and monospecific Araucaria angustifolia plantations. Methods We collected and dissected soil monoliths to describe layers of organic matter and the complex soil food web into these layers. We determined soil pH, soil moisture, total nitrogen, available P, and total organic carbon into each layer (litter, F-layer, H-layer, and A horizon), the biomass of fine roots, the community structure of soil biota, arbuscular mycorrhizal fungi, and nematodes, as well as the microbial biomass carbon. Results In the high-productivity site, there was significantly higher organic matter formation, nutrient cycling (N and P), root growth, soil moisture, soil biota diversity, arbuscular mycorrhizal fungi, nematodes, and microbial activity evaluated by the microbial biomass carbon compared to the low-productivity site. Conclusions High-productivity sites promote the development of organic horizons, root growth on superficial layers that provide plant nutrient release, the A horizon nutrient contents, and the entire soil biota community in monospecific Araucaria angustifolia plantations located on humid subtropical Cambisols. This creates a positive plant-soil feedback that maintains soil quality and increases primary production, nutrient cycling, and habitat and food for the soil food web.

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“…Nevertheless, following a worldwide trend of conservation through the sustainable use of natural resources, several efforts are in progress. Regulations are under intense discussion, and the results of genetic breeding started in the 1970s by EMBRAPA are now delivering promising perspectives AGUIAR, 2012;SILVA et al, 2018), which will probably be the genetic base of a new plantation wave.…”

Section: Introductionmentioning

confidence: 99%

PRUNING Araucaria angustifolia FOR KNOT-FREE TIMBER PRODUCTION

Dobner

2022

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Although A. angustifolia is currently economically unimportant, the worldwide trend of conservation through the sustainable use of natural resources together with an intense discussion of governmental regulations and the recent results of genetic breeding started in the 1970s are delivering promising perspectives for a new wave of plantations. This study aimed to determine optimal pruning strategies by evaluating the diameter and height growth of young A. angustifolia trees as affected by different pruning intensities. Pruning quality in terms of occlusion and defect-core size were also investigated. At the age of 6 years, the pruning experiment was started by conducting six different pruning intensities, named after the number of whorls left after pruning (0, 2, 4, 6, and 8), as well as unpruned (U) trees as a control. From the results obtained in the present study, it was concluded that pruning intensity had a significant negative effect on the growth of young A. angustifolia trees. Diameter was more affected than height growth. Pruning young A. angustifolia trees for knotty-free timber production must be conducted keeping 8 whorls after the intervention if no negative effect in current annual increment in diameter is to be observed when compared to unpruned trees. A defect core of 15 cm seems to be a feasible target for the species regarding optimal pruning intensity to avoid losses in diameter growth. This is strongly dependent on a fast occlusion process, which, in turn, is a result of a careful pruning technique.

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Seleção de procedências e progênies de Araucaria angustifolia (Bert.) O. Kuntze para produção de madeira e pinhão

Cited by 7 publications

References 10 publications

Soil biotic and abiotic traits as driven factors for site quality of Araucaria angustifolia plantations

Soil biotic and abiotic traits as driven factors for site quality of Araucaria angustifolia plantations

Soil biotic and abiotic characteristics as driven factors for site quality of Araucaria angustifolia plantations

PRUNING Araucaria angustifolia FOR KNOT-FREE TIMBER PRODUCTION

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