Pinus durangensis pdf

See also Thompson et al. This is one of Mexico's more important timber trees, and logging is a widespread and commercially important activity in its range. Perry reports that logging has greatly reduced its range. It is also locally used for firewood and carpentry. This species is a host to the dwarf mistletoes Arceuthobium abietinum f. See the "Remarks" in Abies durangensis for a relevant story. Anales Inst. Back Site map Contact us. Edited by Christopher J. Earle Back to top. The Gymnosperm Database.

When they fall, the peduncle and some few scales remain on the tree. Cone scales are stiff and hard. Apophyses are raised, subpyramidal, transversely keeled, and slightly reflexed. Umbos are dorsal, gray, and raised, bearing a sharp, often recurved, persistent prickle. Seeds are gray, measuring 0. Pinus durangensis — a large tree in habitat in Durango, Mexico. Photo by Jeff Bisbee. Pinus durangensis — bark detail. Pinus durangensis — seed cone detail.

Pinus durangensis — foliage and immature seed cones. The percentage of filled seeds Accumulated germination curves of Pinus durangensis Fig. Seed production efficiency of Pinus durangensis Mart. Florida from Durango, Mexico. Accumulated germination curves analyzed by the seed area According to continue studying cone and seed production efficiency at the germination results The results for seed production between production cycles, so that in a future we could efficiency showed statistically significant differences have greater knowledge about this phenomenon.

The Pericos seed stand had the studies will provide the basis for decision-making in highest seed production efficiency, with According to Bramlett et al.

Additionally, low germination The Pericos seed stand showed the highest values of values indicate low seed vigor, which is presumably due productive potential, developed seed, percentage of filled to insect damage and improper site management. However, the seed vigour was low, seed stand of Pinus engelmannii Carr. La of germination with It is necessary to promote better management and found a low seed production efficiency In addition, it to southern pines in USA. The authors indicated that probably, these results are due to Acknowledgements the low pollen production per area, which is associated to the low Pinus leiophylla tree density and the presence of We would like to acknowledge the financial support endogamic processes.

On the other hand, Alba et al. Analyzing cones and of the seed production in three forest management units in seeds in seed areas and seed stands of P. Alejandre and J. Estudio de conos de Pinus pseudostrobus Lindl. Aparicio and R. Fox, G. Failure-time analysis: Emergence, flowering, Ver. Factores de Ecological Experiments.

Eds : S. Scheiner and J. Chapman and Hall, New York, pp. Entomological Society. Jasso and U. Compilado Rev. Roma, Italia, pp. Vargas, S. Trinidad, M. Proceedings of the International Seed Testing Association. Seed Science and Technology Romero and A. SAS Institute Inc.

Chapingo Ser. Cary, NC. Hart, D. Principles of population Besnier, R. Sinauer Associates Inc, Publishers. Sunderland, Massachusetts, USA. Blake, A. Wagner and W. Relative Kruskal, W. Bonner, F. Traducido al Lv, C. Zhang, G. Liu and C. Vargas and L. Bramlett, D. Belcher, G. DeBarr, G. Helteer, R.