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| 1 | Exploring the factors affecting carbon and nutrient concentrations in tree biomass components in natural forests,forest plantations and short rotation forestry显示文摘Background: Coupling biomass models with nutrient concentrations can provide sound estimations of carbon and nutrient contents, enabling the improvement of carbon and nutrient balance in forest ecosystems. Although nutrient concentrations are often assumed to be constant for some species and specific tree components, at least in mature stands,the concentrations usually vary with age, site index and even with tree density. The main objective of this study was to evaluate the sources of variation in nutrient concentrations in biomass compartments usually removed during harvesting operations, covering a range of species and management conditions: semi-natural forest, conventional forest plantations and short rotation forestry(SRF). Five species(Betula pubescens, Quercus robur, Eucalyptus globulus, Eucalyptus nitens and Populus spp.) and 14 genotypes were considered. A total of 430 trees were sampled in 61 plots to obtain 6 biomass components:leaves, twigs, thin branches, thick branches, bark and wood Aboveground leatos biomass was pooled togetto The concentrations of C, N, K P, Ca, Mg, S; Fe, Mn, Cu, Zn and B were measured and the total biomass of each sampled tree and plot were determined. The data were analysed using boosted regression trees and conventional techniques.Results: The main sources of variation in nutrient concentrations were biomass component > > genotype(species)-age >tree diameter. The concentrations of Ca, Mg and K were most strongly affeaed by genotype and age. The concentrations of P, K Ca, Mg; S and Cu in the wood component decreased with age, whereas C concentrations increased, with a trend to reach 50% in the older trees. In the SRF, interamerican poplar and P. trichocorpa genotypes were comparatively more efficient in terms of Ca and K nutrient assimilation index(NAI)(+65-85%) than eucalypts, mainly because leafless biomass can be removed. In the conventional eucalypt plantations(rotation 15 years), debarking the wood at logging(savings of225% of Ca and 254% of Mg for ￡ globulus) or the use of selected genotypes(savings of 45% of P and 35% of Ca) will provide wood at a relatively lower nutrient cost. Considering all the E globulus genotypes together, the management for pulp with removal of debarked wood shows NAI values well above(x 1.7-x 3.9) the ones found for poplar or eucalypt SRF and also higher(x 1.6-X4.0) than the ones found for oak and birch managed in medium or long rotations.The annual rates of nutrient removal were low in the native broadleaved species but the rates of available soil nutrients removed were high as compared to poplar or eucalypts. Management of native broadleaved species should consider nutrient stability through selection of the biomass compartments removed.(Continued on next page)(Continued from previous page)Conclusions: The nutrient assimilation index is higher in poplar grown under short rotation forestry management than in the other systems considered. Nutrient management of fast growing eucalyptus plantations could be improved by selecting efficient genotypes and limiting removal of wood. The values of the nutrient assimilation index are lower in the natural stands of native broadleaved species than in the other systems considered. | Roque Rodriguez-Soalleiro Cristina Eimil-Fraga Esteban Gomez-Garda Juan Daniel Garcia-Villabrille Alberto Rojo-Alboreca Fernando Munoz Nerea Oliveira Hortensia Sixto Cesar Perez-Cruzado | 2018 | Forest Ecosystems2018，5，4： | 3 |
| 2 | The role of cytokines and pathogen recognition molecules in fungal keratitis – Insights from human disease and animal models显示文摘 | Sixto M. Leal Eric Pearlman | 2012 | Cytokine2012，，1： | 2 |
| 3 | Fungal antioxidant pathways promote survival against neutrophils during infection显示文摘 | Leal Sixto M Vareechon Chairut Cowden Susan Cobb Brian A Latgé Jean-Paul Momany Michelle Pearlman Eric | 2012 | EN2012，，7： | 2 |
| 4 | Risk ofplacental abruption in relati on to migraines and headaches显示文摘 | Sixto ES Michelle AW Percy NP | 2010 | BMCWomen''s Health2010，10，30： | 1 |
| 5 | Genital Tract Infections, Bacterial Vaginosis, HIV, and Reproductive Health Issues among Lima-Based Clandestine Female Sex Workers显示文摘 | M. E. Perla Annette E. Ghee Sixto Sánchez R. Scott McClelland Annette L. Fitzpatrick Luis Suárez-Ognio Javier R. Lama Jorge Sánchez Gregory T. Spear | 2012 | Infectious Diseases in Obstetrics and Gynecology2012，，： | 1 |
| 6 | Photo-catalysis with solar energy at a pilot-plant scale:an overview显示文摘 | MALATO SIXTO BLANC JULIAN ALFONSO VIDAL | 2002 | Applied Catalysis B:Encironmental2002，37，1： | 1 |
| 7 | Degradation of some biorecalcitrant pesticides by homogeneous and heterogeneous photocatalytic ozonation 显示文摘 | Maria J F Maria I F Sixto M | 2005 | Chemosphere2005，58，8： | 1 |
| 8 | A study of the role of ion–molecule chemistry in the formation of sporadic sodium layers显示文摘 | Stephen C. Collins John M.C. Plane Michael C. Kelley Timothy G. Wright Pavel Soldán Timothy J. Kane Andrew J. Gerrard Brent W. Grime Rosie J. Rollason Jonathan S. Friedman Sixto A. González Qihou Zhou Michael P. Sulzer Craig A. Tepley | 2002 | Journal of Atmospheric and Solar-Terrestrial Physics2002，，7： | 1 |
| 9 | Assessment of salt tolerance in Populus alba clones using chlorophyll fluorescence显示文摘 | Sixto H Aranda I Grau JM | 2006 | Photosynthetica2006，44，2： | 1 |
| 10 | Photocatalysis with solar energy at a pilot-plant scale: an overview显示文摘 | Malato Sixto Blanco Julián Vidal Alfonso | 2002 | Applied Catalysis B: Environmental2002，37，： | 1 |
| 11 | Improving the performance of colloidal quantum-dot-sensitized solar cells显示文摘 | Sixto Giménez Iván Mora-Seró Lorena Macor Nestor Guijarro Teresa Lana-Villarreal Roberto Gómez Lina J Diguna Qing Shen Taro Toyoda Juan Bisquert | 2009 | Nanotechnology2009，，： | 1 |
| 12 | Improving the performance of colloidal quantum-dot-sensitized solar cells 显示文摘 | Sixto G Iv'an M S Lorena M | 2009 | Nanotechnology2009，20，29： | 1 |
| 13 | Recombination in quantum dot sensitized solar cells 显示文摘 | Ivan M S Sixto G Francisco F S | 2009 | Acc Chem Res2009，42，11： | 1 |
| 14 | 显示文摘 | Ivan M S Sixto G Francisco F S | 2009 | Acc Chem Res2009，42，11： | 1 |
| 15 | Assessment of salt tolerance in Populus alba clones using chlorophyll fluorescence显示文摘 | H Sixto I Aranda J M Grau | 2006 | Photosynthetica2006，44，2： | 1 |
| 16 | Is 3D Finally Ready for the Web?显示文摘 | Sixto Ortiz Jr | 2010 | Computer2010，43，： | 1 |
| 17 | The Behaviour of Myo-inositol Hexakisphosphate in the Presence of Magnesium(II) and Calcium(II) : Protein-free Soluble InsP(6) is Limited to 49 mu M under Cytosolic/ Nuclear Conditions显示文摘 | VEIGA N TORRES Julia DOMINGUEZ Sixto | 2006 | Journal of Inorganic Biochemistry2006，100，： | 1 |
| 18 | Paracetamol degradation intermediates and toxicity during photo-Fenton treatment using different iron species显示文摘 | Alam G. Trovó Raquel F. Pupo Nogueira Ana Agüera Amadeo R. Fernandez-Alba Sixto Malato | 2012 | Water Research2012，，16： | 1 |
| 19 | Solar photocatalysis: a clean process for water detoxification显示文摘 | Didier Robert Sixto Malato | 2002 | The Science of the Total Environment2002，，291： | 1 |
| 20 | Getting on Board the Enterprise Service Bus显示文摘 | Sixto O J | 2007 | Communications of the ACM2007，40，4： | 1 |
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