BackgroundThe composition, structure and biological diversity of two regenerated areas after livestock activities in a Tamaulipan thornscrub vegetation from Northeast Mexico were evaluated. The regeneration of each area was evaluated with the establishment of 12 sampling sites of 50m2. From the data obtained ecological indexes such as: Importance Value Index and Diversity (alpha and beta) were evaluated.ResultsA total of 17 families, 40 genera and 42 species were registered, the most representative family was Fabaceae with 11 spp. The intensive livestock area had 36 species; a Margalef index of 4.44 and a 1.24 Shannon index, while the extensive livestock area had 32 species, a Margalef index of 4.24 and a 2.16 Shannon index. The communities evaluated have a (48%) mean similarity.Conclusions1) Regenerated communities after livestock use showed higher richness of species and alpha diversity.2) Evaluated communities have a mean similarity of (48%). 3) Even after 25 years of regeneration the most dominant species was Cenchrus ciliaris that is used for cattle forage.

中文翻译：

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墨西哥塔毛利班荆棘的两个后畜牧区的植物组成和结构

背景评估了墨西哥东北部塔毛利班荆棘植被中两个经过牲畜活动后再生区域的组成、结构和生物多样性。通过建立12个50平方米的采样点来评估每个区域的更新。从数据获得的生态指标如：重要性价值指数和多样性（α和β）进行评价。结果共登记17科40属42种，最具代表性的科为豆科植物11种。集约化畜牧区有36种；Margalef 指数为 4.44，香农指数为 1.24，而粗放畜牧区有 32 种，Margalef 指数为 4.24，香农指数为 2.16。评估的社区具有 (48%) 平均相似度。结论1) 牲畜使用后的再生群落显示出更高的物种丰富度和α多样性。2) 评估群落的平均相似度为(48%)。3) 即使经过 25 年的再生，最主要的物种还是用于牛饲料的 Cenchrus ciliaris。