Abstract
The objective of this study was to evaluate biomass allocation and nutrient pools in aboveground biomass components in 18-month-old plantations of Eucalyptus saligna and E. urophylla × E. grandis (i.e. E. urograndis) in Brazil. The plantations were established by pulp companies in a large area comprising three soil types (Acrisols, Vertisols and Leptosols) in the grassland biome in southern Brazil, and an operational regime of planting and maintenance fertilization was used to ensure full availability of nutrients. Vertisols showed the highest availability of soil nutrients, and the P and Ca concentrations in aboveground biomass were also highest in this type of soil. The nutritional status of both species indicates great consumption of nutrients, particularly of P, K and Ca. At this early age, canopy biomass components still made the largest relative contribution, although debarked stem biomass already accounted for 41.5% and 37.4 of total aboveground biomass in E. saligna, and E. urograndis, respectively. Nutrient concentrations in biomass components were similar across species. For all macronutrients, except Ca and Mg, the concentration gradient followed the order wood < bark < branches < leaves. For all micronutrients, except Cu, the concentration gradient followed the order wood < branches ≈ bark < leaves. At the plantation stage studied, i.e. before canopy closure, the importance of the components as nutrient pools followed the order leaves > branches > wood > bark. The branches hold the majority of Ca reserves in biomass and are a very important pool of Mg, K, P and B. The bark makes a small contribution to total biomass, but stores a similar amount of Ca as leaves, being the second major pool after the branches. Comparison of the nutrients supplied by fertilization and the amounts stored in soil and aboveground indicates that the operational dose should be adjusted to each type of soil after further experimental fertilizer trials, as the supply of N and P appears to be too high, particularly for Vertisols. This is leading to the immobilization of P in biomass components that are not of importance in the biological or biochemical nutrient cycles, thus increasing the risk of larger exports of P during biomass removal.



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Acknowledgements
We thank the National Council of Technological and Scientific Development (CNPq—Brazil), for a research grant awarded to the first author (Award Number 200589/2014-8) for a stay at the USC in Spain, and the Fibria pulp and paper company for making the study area available and also for financial and logistical support. We also thank Irineu Medeiros for help with biomass sampling.
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Viera, M., Schumacher, M.V., Bonacina, D.M. et al. Biomass and nutrient allocation to aboveground components in fertilized Eucalyptus saligna and E. urograndis plantations. New Forests 48, 445–462 (2017). https://doi.org/10.1007/s11056-017-9572-x
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DOI: https://doi.org/10.1007/s11056-017-9572-x


