03223naa a2200277 a 450000100080000000500110000800800410001902200140006002400400007410000170011424501560013126000090028750006150029652017230091165000150263465300120264965300080266165300140266965300210268365300280270470000280273270000260276070000150278670000180280177301260281910608872020-09-29       2020    bl uuuu     u00u1 u    #d  a0961-95347 a10.1016/j.biombioe.2020.1055022DOI1 aRESQUÍN, F.  aEvaluation of the nutrient content in biomass of Eucalyptus species from short rotation plantations in Uruguay. (Research paper)h[electronic resource]  c2020  aArticle history: Received 1 August 2019 / Revised 27 December 2019 / Accepted 31 January 2020 / Available online 10 February 2020. Corresponding author: Fernando Resquín - emai: nando@inia.org.uy. Funding text: This study was funded by the National Institute of Agricultural Research (INIA) and the National Agency of Research and Innovation (ANII) through the grant FSE 1 2011 15615 (Evaluación productiva y ambiental de plantaciones forestales para la generación de Bioenergía). The authors thank the Forestal Oriental company for providing the logistical support for the installation of the experiments.  aABSTRACT. Forest biomass is an interesting option for bioenergy generation, however sustainability aspects should be carefully considered. In this context, the nutrient exportation is a key factor for reach a sustainable biomass production by an adequate harvest decision about what tree's fractions will export less nutrients of farms. In this work biomass production per fraction and nutrient export for three eucalypt species (Eucalyptus benthamii, E.dunnii and E.grandis) planted at four planting densities: 2220, 3330, 4440 and 6660 trees per hectare, in two different sites, were evaluated at the age of 76 months. The assessed nutrients were: P, Ca, Mg, K and N in bark, branches, leaves, and stemwood fractions. Nutrients use efficiency and the balance between available cations in the soil (Ca, Mg and K) vs their export in the different tree components were assessed. The effect of the interaction (species x planting density) for almost all the variables evaluated was not significant in both sites. The nutrients concentration is slightly affected by the planting density while the nutrient export is significantly related to this parameter in both sites. Bark is the fraction with the higher Ca and Mg concentration values, whereas the higher concentrations of N and K were found on the leaves, meanwhile debarked stemwood is the fraction with the lower nutrient concentration. In the short term, K would be the nutrient that will exhaust first, although the use of stemwood allows an important reduction in the use of cations. Even with low planting densities it is possible to obtain high biomass yields and similar to those achieved with the lowest spacing in particular at the Paysandú site.  © 2020  aEUCALYPTUS  aBiomass  aNUE  aNutrients  aPlanting density  aShort rotation forestry1 aNAVARRO-CERRILLO, R. M.1 aCARRASCO-LETELIER, L.1 aRACHID, C.1 aBENTANCOR, L.  tBiomass and Bioenergy, March 2020, Volume 134, Article number 105502. Doi: https://doi.org/10.1016/j.biombioe.2020.105502