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Recycled alkaline paper waste influenced growth and structure of Pinus taeda L. forest

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Abstract

Alkaline residues of recycled paper production (ARRP) can be an alternative for correcting soil acidity and adding bases to Pinus taeda L. systems. Our aim was to investigate the effect of increasing doses of ARRP on tree, forest floor (litter and root), and soil composition in a 3-year-old Brazilian pine forest plantation. In 2007, ARRP treatments of 0, 10, 20, 30 and 40 T ha−1 were imposed. Tree growth and needle elemental composition were evaluated in 2008 and 2018; elemental composition of the trunk was evaluated in 2018. In 2017, accumulation and composition of litter layers were assessed: new litter, old litter, first and second sublayers of fragmented litter (Fr and Fm), and the humified layer (H); roots present in F and H layers were quantified (amount and elemental composition). In addition, soil chemical properties at different depths were evaluated in 2008, 2012, and 2017. The application of ARRP improved growth by ~ 16% up to 20 T ha−1 after 10 years. Also, ARRP increased Ca concentration in needles, trunks, roots, and all litter fractions since Ca was a major component of ARRP. There was no change in total litter accumulation with ARRP application, but an increase in the humidified fraction was observed. Root growth was enhanced by ARRP, leading to great changes in root composition in Fr and H fractions. Changes in soil pH, Ca2+, and Al3+ were observed in the 0–10 cm soil layer. Findings suggest that application of ARRP to established pine forests has the potential for improving productivity.

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Acknowledgements

The authors thank the Cahdan Volta Grande Brazilian paper companies and staff (Forest Eng. Daniel Maros) and Embrapa Floresta for field work support. Antônio Carlos Vargas Motta is grateful to the National Council for Scientific and Technological Development (CNPq) for financial support (project n° 306908/2016-6) and to the Coordination for the Improvement of Higher Education Personnel (CAPES) for scholarship support.

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Correspondence to Ederlan Magri.

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Rabel, D.d., Maeda, S., Araujo, E.M. et al. Recycled alkaline paper waste influenced growth and structure of Pinus taeda L. forest. New Forests 52, 249–270 (2021). https://doi.org/10.1007/s11056-020-09791-5

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  • DOI: https://doi.org/10.1007/s11056-020-09791-5

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