Riparian vegetation affected by bank erosion in the Lower São Francisco River, Northeastern Brazil

Revista Árvore

Francisco Sandro Rodrigues Holanda¹  Laura Galvão Da Cunha Santos¹  Cícero Marques Dos Santos¹  Ana Patrícia Barreto Casado¹  Alceu Pedrotti¹  Genésio Tâmara Ribeiro¹ 

[1] ,Universidade Federal de SergipeSão Cristovão SE ,Brazil

关键词: Floristic survey;    riparian vegetation;    riverbank destabilization;    São Francisco River;    Levantamento florístico;    vegetação ciliar;    desestabilização de taludes;    rio São Francisco;   

DOI  :  10.1590/S0100-67622005000200016

来源: SciELO

【 摘 要 】

Changes in the hydrological regime of the Lower São Francisco River, located in Northeastern Brazil have brought negative environmental impacts, jeopardizing the flora and fauna of a global biodiversity hotspot, due to implementation of hydroelectric power dams and surface water withdrawal for irrigation in public and private perimeters. Remnants of the riparian stratum associated to the riverbank destabilization in six fragments were studied by surveying trees, shrubs, herbs, and aquatic species. The calculation of the Factor of Safety (FS) was performed in order to understand the riverbank's stability related to soil texture and vegetation cover. An overall number of 51 botanic families distributed in 71 genera and 79 species were recorded, predominantly from the families Mimosaceae, Myrtaceae, and Fabaceae. The fragmented riparian vegetation is mostly covered by secondary species under a strong anthropogenic impact such as deforestation, mining and irrigation, with an advanced erosion process in the river margins. Strong species that withstand the waves present in the river flow are needed to reduce the constant landslides that are mainly responsible for the river sedimentation and loss of productive lands. A lack of preservation attitude among the local landholders was identified, and constitutes a continuing threat to the riparian ecosystem biodiversity.

【 授权许可】

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