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Abstract
Abstract The management of eucalyptus harvest residues can affect the initial growth and nutrient content of new eucalyptus plantations. We investigated the initial growth and nutritional status of Eucalyptus saligna plantation according to five alternative strategies for management of harvest residues on sandy soil, in the municipality of Barra do Ribeiro, RS. The total height, diameter at breast height (DBH), individual volume and nutrient content in the leaves were evaluated after twelve months. We observed that the maintenance of harvest residues increased growth in height, DBH and individual volume. The levels of calcium in leaves of eucalyptus were higher in the treatments in which harvest residues were removed, whereas the opposite was confirmed for sulfur. The differences found in our study point that the maintenance of harvest residues increase the eucalyptus growth, especially in sandy soils.
Highlights
AND OBJECTIVESForest plantations occupy an area of about 200 million ha in the world, in order to attend the increased demand for wood and to sequester carbon dioxide from the atmosphere (Zhang et al, 2012)
We investigated the initial growth and nutritional status of Eucalyptus saligna plantation according to five alternative strategies for management of harvest residues on sandy soil, in the municipality of Barra do Ribeiro, RS
In Brazil, these eucalyptus plantations have been established in areas with predominantly low-fertility soils that are highly dependent upon nutrient cycling through plant litter and the decomposition of harvest residues (HR)
Summary
AND OBJECTIVESForest plantations occupy an area of about 200 million ha in the world, in order to attend the increased demand for wood and to sequester carbon dioxide from the atmosphere (Zhang et al, 2012). In Brazil, the area with planted forests occupies approximately 7.74 million ha, comprising species of the genera Eucalyptus, Pinus, Acacia and Tectona (Iba, 2017). This area is expected to grow by 3.0 million ha by 2020 due to the goal of the National Plan for Low Carbon Agriculture (MAPA, 2010). In Brazil, these eucalyptus plantations have been established in areas with predominantly low-fertility soils that are highly dependent upon nutrient cycling through plant litter and the decomposition of harvest residues (HR). The maintenance of forest harvests residues brings advantages by promoting the initial growing of trees (Laclau et al, 2010) due to the improvement of soil characteristics such as the availability of soil nutrients (Hernández et al, 2016; Menegale et al, 2016; Mendham et al, 2014) and soil organic matter (Achat, Fortin et al, 2015; Epron et al, 2015), as well as the soil microbial activity (Nambiar & Harwood, 2014; Wu et al, 2011)
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