Madrigal J.,CIFOR INIA |
Hernando C.,CIFOR INIA |
Guijarro M.,CIFOR INIA |
Vega J.A.,CINAM Lourizan |
And 2 more authors.
Plant Ecology | Year: 2010
In the present study, a smouldering fire was reproduced in a substrate from a Pinus pinaster forest in the southeastern Iberian Peninsula. Experiments were carried out, in laboratory, using soil monoliths to assess the short-term fire-induced effects on germination, survival and morphological traits in young (3-year-old) specimens of Pinus pinaster Ait. The fire caused a severe reduction in the litter and humus layer relative to a control (unburnt) soil. A lower percentage of accumulated germination (29% in the burnt soil compared with 71% in the control soil) reduced final seedling density, and a lower seedling height was observed in burnt soil. Furthermore, the amount of biomass fixed per unit of leaf area and the concentration of foliar nutrients were lower in the seedlings grown in the burnt soil. However, the amount of biomass fixed per individual seedling was significantly higher in the burnt soil than in the control soil. The results confirm the observed lesser P. pinaster recruitment in burnt stands in southeastern Spain. © 2009 Springer Science+Business Media B.V.
Codesido V.,CINAM Lourizan |
Codesido V.,Campus Universitario Sur |
Zas R.,CINAM Lourizan |
Fernandez-Lopez J.,CINAM Lourizan
European Journal of Forest Research | Year: 2012
Individual and family heritabilities and juvenile-mature genetic correlations were estimated for growth and biomass traits recorded in treatment with optimal and limiting water and/or nutrient availability to study how the different growth environments affected genetic parameter estimates. Thirty open-pollinated families, randomly selected among the 58 families used in field progeny tests in Galicia, were cultivated for 30 weeks in a climatic chamber under controlled conditions. Two water regimes (high and low water supply) combined with two nutrient regimes (high and low nutrient supply) were applied by subirrigation. Several growth, branching and dry mass traits were assessed 30 weeks after sowing and compared with field performance (height, diameter and volume) of 4-year-old progeny tests established at three different sites in Galicia (NW Spain). Both the irrigation and the fertilization treatments had a strong effect in all the assessed traits except irrigation for the number of branches. Heritabilities for growth and biomass traits were moderate to high (0.13-0.77) in individual treatments. However, when analyzing all treatments together, the impact of the family × treatment interactions led to a reduction (0.20-0.35) in the heritability estimates. The results indicated that the genotype × water and genotype × nutrient interactions may be important and could not be ignored in the Galician radiata pine breeding program. Climatic chamber-field correlations were different between different traits measured at climatic chamber experiments and the three field tests. The correlations were larger with the well-watered treatments, suggesting that further development of early testing methods for radiata pine in Galicia should include treatments with no limiting water availability. © 2011 Springer-Verlag.