Abstract

GARCIA-AREVALO, Abel. Vegetation and flora of woods relictual Picea Chihuahuana Martinez from northern Mexico. Polibotánica [online]. 2008, n.25, pp.45-68. ISSN 1405-2768.

Forty eight 20 x 20 m sites were randomly established within the area of distribution of Picea chihuahuana, the objective being to elucidate the structure and composition of the forest. Dasonomic variables, including species frequency, height, DAP (diameter at breast height), overstory cover in m2, as well as such ecological variables as altitude, slope, exposure, depth of organic material, and soil pH, were recorded. Additionally, 10 1 m2 plots of were established within each 400 m2 site, in which the herbaceous plant cover in the understory was recorded in both dry and wet seasons. The vegetation of the study area is composed primarily of units of conifer forests and mixed conifer-oak forests. The associations of widest distribution are those consisting of combinations of conifers. In lower proportions are combinations with oaks. In total, 14 vegetative associations were defined. Floristically, 53 families, 141 genera, and 199 species of vascular plants were recorded; and phytogeo-graphically, it was concluded that the local lora is geographically related to the lora of western North America. With respect to conservation needs, Picea chihuahuana is an endangered species; Mammillopsis senilis is a threatened species; and Arbutus occidentalis, Peduncularis glabra, and Pseudotsuga menziesii are special-protection species.

Keywords : vegetation; flora; Picea chihuahuana; conservation; Durango.

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