The research was conducted between March 2013 and July 2014 in preservation areas that protect water resources in the Andreas Stream Basin, RS, and aimed to evaluate the phytosociological structure of these areas, which were established through the Payment for Environmental Services (PES). A total of 83 species, distributed in 72 genera and 34 families were recorded in twenty sampling points. The results of the cluster analysis indicate the occurrence of five groups based on the averages of the Importance Value Index (IVI), highlighting Group 1 that showed the highest average and significant differences (p < 0.05) compared to the other groups, being them: Allophylus edulis (A. St.-Hill., Cambess. & A. J.) R, Casearia silvestres SW, Cupania vernalis Cambess, Inga marginata Willd, Matayba elaeagnoides Radlk. and Nectandra megapotamica (Spreng.) Mez. These species are recommended for restoration in preservation areas that were degraded, highlighting that PES is highly efficient in terms of sustainability.

中文翻译：

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巴西南部水源保护区的植物社会学调查

该研究于 2013 年 3 月至 2014 年 7 月在 RS 安德烈亚斯河流域的水资源保护区进行，旨在评估这些地区的植物社会学结构，这些结构是通过环境服务支付 (PES) 建立的。在20个采样点共记录了83种，分布在72属34科。聚类分析的结果表明，基于重要性价值指数 (IVI) 的平均值出现了五个组，突出显示了与其他组相比平均差异和显着差异 (p < 0.05) 最高的组 1，它们是： Allophylus edulis (A. St.-Hill., Cambess. & AJ) R, Casearia silvestres SW, Cupania vernalis Cambess, Inga marginata Willd, Matayba elaeagnoides Radlk。和 Nectandra megapotamica (Spreng. ) 梅兹。建议在退化的保护区恢复这些物种，突出 PES 在可持续性方面非常有效。