RESUMENSe estudió la vegetación en diez municipios del extremo meridional de la Mixteca poblana con una superficie aproximada de 1,668.74 km 2 . Se efectuaron colectas botánicas y un muestreo ecológico cuantitativo para estimar los valores de importancia y área basal para las especies arbóreas en las áreas mejor conservadas, con el objetivo de determinar los tipos de vegetación existentes y las asociaciones vegetales aún presentes. Los resultados indican la existencia de cinco tipos de vegetación correspondientes a bosque tropical bajo caducifolio, bosque bajo palmatifoliado, bosque tropical bajo de durifolios, bosque mediano perennifolio ripario y bosque templado bajo de escuamifolios. Se identificaron 13 asociaciones vegetales, siete de las cuales pertenecen al bosque tropical bajo caducifolio, que es el tipo de vegetación más representativo. La lista florística preliminar incluye 360 especies, 225 géneros y 77 familias de plantas vasculares. Se discuten de manera general los patrones de la vegetación, sus posibles causas, la importancia de la flora a nivel regional y el estado actual de conservación de la cubierta vegetal. ABSTRACTA vegetation sampling was carried out in ten municipalities of the southern Mixteca region of Puebla, with an area of approximately 1,668.74 km 2 . Botanical samplings were made along with a quantitative ecological sampling to estimate the values of importance and basal area for the tree species of the most conserved areas. The objective was to determine the existing types of vegetation and the plant associations still present. Results indicate the existence of five vegetation types corresponding to deciduous tropical forest, palm land, tropical oak forest, gallery forest and Juniperus forest. Thirteen plant associations were identified, including seven that belong to the tropical oak forest, the most representative vegetation type. The preliminary floristic list includes 360 species, 225 genera and 77 families of vascular plants. A general discussion is made of vegetation patterns, their possible causes, the importance of the flora at the regional level and the present conservation status of the vegetation.
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