Pinsapo forests: past, present and future. Bois et Forêt des Tropiques. 292: 39-47.


Abstract: In view of the unique nature of the discovery, this article is an account of the three botanical expeditions made to the natural enclaves of Abies pinsapo Boiss., firstly by the Swiss botanist Edmond Boissier in 1837, then by the Spanish forestry engineers Luis Ceballos Fernández de Córdoba and Manuel Martín Bolaños in 1928, and later by another Spanish forestry engineer, Santiago Sánchez Cózar, in 1946. The two later expeditions were to the Moroccan Rif, to Mount Mago and Mount Tazaout respectively, and it was these expeditions which enabled the Rifian firs to be identified as varieties of the Andalusian pinsapo fir. The Iberian and Rifian pinsapo forests are stabilised at present, due to the work of the respective conservation organisations for protected natural areas and the abandonment of the area by the rural inhabitants, which has ended the stockraising and logging to which these forests were subjected for many years. However, fire and climate change represent a threat to their continued survival.

 

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Comparison of the hygroscopic behaviour of 205-year-old and recently cut juvenile wood from Pinus sylvestris L. Annals of Forest Science. 63: 309-317.



The hygroscopic response of the juvenile wood of Pinus sylvestris L. from recently cut trees from the Valsain Forest in Segovia, Spain (new wood) was compared to that of the juvenile wood of the same species used in roof rafters installed at the end of the eighteenth century (old wood), which came from the same forest. The 35 degrees C isotherms were plotted using the saturated salts method, and the mathematical fit used was the GAB model. The infrared spectrums and the X-ray diffractograms were used in order to study the possible chemical variations and crystallinity indices of the cell wall. The adsorption-desorption loop of the old wood is above the loop of the new wood, although the hysteresis coefficient is higher in the old wood. The peaks corresponding to the-OH groups are similar, although the degree of crystallinity is significantly lower in the old wood. While cellulose crystallinity differs between the old and new wood, and has a major influence on wood hygroscopicity, other modifications in the amorphous components of the cell wall may have contributed to the changes in hygroscopicity between the old and new wood.

 

The wood of Pinus canariensis C. Smith and its resinous heartwood. IAWA Journal. 26(1): 69-77.



Pinus canariensis (Canary Island Pine or Pitch Pine) forms natural forests on the islands of Tenerife and La Palma. The heartwood has an extraordinarily high resin content, and this paper provides an anatomical description of the wood as well as an interpretation of the factors relating to this resinification. Pinus canariensis possesses many subsidiary parenchyma cells surrounding the axial resin canals. Similarly, the percentage of rays is high, which means there are many parenchyma cells capable of accumulating large amounts of starch, which in turn can be used for the synthesis of the pitch extractives, primarily terpenoids and polyphenols. The presence of subsidiary parenchyma cells and the high percentage of rays are a major contributor to the heartwood of Pinus canariensis being rich in extractives.

 

Oriented stranboard panels made from quebracho blanco (Aspidosperma quebracho-blanco Schlecht.) and Pinus taeda L. Forest Product Journal. 56(5): 37-42.



Through this work, the technical and industrial viability of the use of the wood of quebracho blanco (Aspidosperma quebracho-blanco Schlecht.) in the making of oriented strandboard (OSB) panels was studied. Due to the high density of this wood, a mixture was made using strands of loblolly pine (Pinus taeda L.), whose low density allows panels with technological features in line with the requirements of market standards to be obtained. Thirty-six boards with a strand geometry of 59 mm (length) and 0.50 mm (thickness) were made using quebracho and loblolly pine. The percentage of quebracho in the core layer and the surface layers was varied. Three percentages of quebracho were used: 20, 40, and 60 percent. Finally, 24 panels with 3 different dosages of binder were tested: 7, 10, and 13 percent in relation to the dry wood weight. The bonding was done on the quebracho and pine strands both mixed together and separately. Tests were done on parallel and perpendicular bending, perpendicular tension, and swelling. The statistical analyses concluded that OSB can be made using quebracho and loblolly pine using a maximum of 40 percent quebracho strands in the surface layers and 60 percent in the core layer, with separate bonding of the strands recommended.

 

New xylological data and the biogeography of the Iberian Peninsula during the Early Cretaceous. Geobios. 39: 805-816.



The position of the Iberian Peninsula during the Early Cretaceous, sandwiched between Laurasia and Gondwana, makes it an important area for the biogeography study of terrestrial ecosystems. Relevant data are, however, scarce. The discovery of silicified wood in the west of the Cameros Basin, in the village Hacinas (Spain), is the first record of the genus Protopodocarpoxylon in Spain and the seventh of Agathoxylon. A new species, Protopodocarpoxylon haciniensis sp. nov., is described. The anatomy of the samples studied shows that paleoclimatic conditions during the Early Cretaceous in the western part of the Cameros Basin were favorable to tree growth, with good water supply during the growth season. Although much impoverished in comparison with Western Europe, the Iberian Early Cretaceous wood floras are clearly Laurasian in affinity.

 

Esteban, L.G.

de Palacios, P.


2007

10

Esteban, L.G.

de Palacios, P.

Philippe, M.

Guindeo, A.

García Fernández, F.


2006

Esteban, L.G.

Medina, J.C.

de Palacios, P.

Guindeo, A.

García Fernández, F.


2006

Esteban, L.G.

García Fernández, F.

Guindeo, A.

de Palacios, P.

Gril, J.


2006

Esteban, L.G.

Gasson, P.

Climent, J.M.

de Palacios, P.

Guindeo, A.


2005

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