Journal
FOREST ECOLOGY AND MANAGEMENT
Volume 165, Issue 1-3, Pages 193-203Publisher
ELSEVIER
DOI: 10.1016/S0378-1127(01)00617-X
Keywords
allometry; demography; Pinus cembroides; Pinus nelsonii; pinyon pines; population growth
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Pinus nelsoni Shaw and Pinus cembroides Zucc. are the most important pinyon pine species in the northern region of the Sierra Madre Oriental in Mexico. A demographic study of these two species was conducted between 1996 and 1998. The two species differed in their size structure: P cembroides had a higher proportion of large individuals and seedlings that P nelsoni. The growth rate of the P. nelsoni population projected with the 1996 data indicated moderate positive growth (lambda = 1.083), but the drought of 1997 predicted a long-run annual population decrease of 1% (lambda = 0.990). The forest fires of 1998, which occurred in 30% of the distribution area of these two species, will have long-term population consequences. The importance of this particular event in the development of a management strategy for these species is discussed in light of the results obtained from the previous 2 years. (C) 2002 Elsevier Science B.V. All rights reserved.
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