RT info:eu-repo/semantics/contributionToPeriodical T1 Plasticity in Pinus pinaster populations of diverse origins: Comparative seedling responses to light and Nitrogen availability A1 Rodríguez García, Encarna A1 Bravo Oviedo, Felipe K1 Pinos-Crecimiento AB The effects of light and N availability, and population on seedling morphology and biomassallocation were assessed in eleven months seedlings from ten Pinus pinaster populations. Weconducted a garden experiment using a light gradient (full sunlight, HL= 337.1 μmol m2 s-1;medium light, ML= 120.6 μmol m2 s-1; and low light, LL= 30 μmol m2 s-1) and twocontrasting soil fertility regimes: low-N and high-N availability. Light availability was animportant factor controlling phenotypic plasticity. However, differences between productivityenvironments were observed, especially in full sunlight and medium light conditions, whichsuggest that soil fertility may be very important at early successional stages at open andmedium shaded microsites, but would exert low influence in deep shade conditions.Population-specific responses were observed for many traits, which suggest a genetic controlof morphological plasticity. All populations produced more total dry weight with HL andhigh-N. When light and/or N richness varied, growth depended upon which resource wasmore limiting. Results indicated ontogenetic drift but when seedlings were compared at thesame size, results fitted with optimal partitioning theory. Allocation to needles was higher inHL and ML/ high-N conditions, while allocation to root was higher in low-N seedlings in HLand ML conditions. With shade (ML and LL) all populations allocated more dry weight tostem, regardless N availability. A significant increment in stem height was observed withshade increase. PB Elsevier SN 0378-1127 YR 2013 FD 2013 LK http://uvadoc.uva.es/handle/10324/7661 UL http://uvadoc.uva.es/handle/10324/7661 LA eng NO Forest Ecology and Management, Volumen 307, pp 196-205 NO Instituto Universitario de Gestión Forestal Sostenible DS UVaDOC RD 29-mar-2024