Contribution of the root system of vetiver grass towards slope stabilization of the São Francisco River

Autores

  • Lorena Machado Universidade Federal de Sergipe
  • Francisco Sandro Rodrigues Holanda Universidade Federal de Sergipe
  • Vanessa Sousa da Silva Universidade Federal de Sergipe
  • Antonio Iury Alves Maranduba Universidade Federal de Sergipe
  • Janisson Bispo Lino Universidade Federal de Sergipe

DOI:

https://doi.org/10.5433/1679-0359.2015v36n4p2453

Palavras-chave:

Chrysopogon zizanioides, Soil reinforcement, Bank erosion.

Resumo

The control of soil erosion along the banks of the São Francisco River requires the use of efficient and economically viable strategies. Soil bioengineering techniques may be an alternative to the conventional methods as they provide good soil stabilization by mechanical reinforcement promoted by the roots. The objective of this study was to evaluate the contribution of the root cohesion of vetiver grass (Chrysopogon zizanioides (L.) Roberty) on slope stabilization in erosion control along the right margin of the São Francisco river. Seedlings of vetiver grass were planted in the riverbank of the Lower São Francisco located in Sergipe State, northeast Brazil, and plants were sampled after two years of growth to evaluate the effect of grass on the shear strength of the soil. The monolith and cylinder method was used to collect roots for the evaluation of Root Density (RL), Root Length Density (RLD), Root Area Ratio (RAR), Root Tensile Strength (TR), and Root Cohesion (CR). Data were submitted to analysis of variance (p < 0.05), with polynomial regression analysis. The results show that for RL, RLD, and RAR, the layers of soil at depths of 0-0.10 m had the highest values of 4.84 kg m-3, 12.45 km m-3, 1.66%, respectively. The mean TR was 83 MPa and CR was 528 kPa. Vetiver increases shear strength of the soil and slope stabilization.

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Biografia do Autor

Lorena Machado, Universidade Federal de Sergipe

Engª Agrª, M.e em Agroecossistemas, Deptº de Engenharia Agronômica, Universidade Federal de Sergipe, UFS, São Cristóvão, SE, Brasil.

Francisco Sandro Rodrigues Holanda, Universidade Federal de Sergipe

Engº Agrº, Prof. Dr., Deptº de Engenharia Agronômica, UFS, São Cristóvão, SE, Brasil.

Vanessa Sousa da Silva, Universidade Federal de Sergipe

Discente do Curso de Graduação em Engenharia Florestal, Deptº de Engenharia Florestal, UFS, São Cristóvão, SE, Brasil.

Antonio Iury Alves Maranduba, Universidade Federal de Sergipe

Discente do Curso de Graduação em Engenharia Agronômica, Deptº de Engenharia Agronômica, UFS, São Cristóvão, SE, Brasil.

Janisson Bispo Lino, Universidade Federal de Sergipe

Discente do Curso de Graduação em Engenharia Agronômica, Deptº de Engenharia Agronômica, UFS, São Cristóvão, SE, Brasil.

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Publicado

2015-08-13

Como Citar

Machado, L., Holanda, F. S. R., Silva, V. S. da, Maranduba, A. I. A., & Lino, J. B. (2015). Contribution of the root system of vetiver grass towards slope stabilization of the São Francisco River. Semina: Ciências Agrárias, 36(4), 2453–2464. https://doi.org/10.5433/1679-0359.2015v36n4p2453

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