African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6578

Full Length Research Paper

Impacts of wetland cultivation on plant diversity and soil fertility in South-Bench District, Southwest Ethiopia

Kassahun Mulatu
  • Kassahun Mulatu
  • Department of Natural Resource Management, College of Agriculture and Natural Resource, Mizan-Tepi University P. O. Box 260, Mizan Teferi, Ethiopia
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Debela Hunde
  • Debela Hunde
  • Department of Natural Resource Management, College of Agriculture and Veterinary Medicine, Jimma University P. O. Box 307, Jimma, Ethiopia.
  • Google Scholar
Endalkachew Kissi
  • Endalkachew Kissi
  • Department of Natural Resource Management, College of Agriculture and Veterinary Medicine, Jimma University P. O. Box 307, Jimma, Ethiopia.
  • Google Scholar


  •  Received: 27 January 2013
  •  Accepted: 10 September 2014
  •  Published: 23 September 2014

Abstract

Wetlands provide enormous socioeconomic and environmental values. However, wetlands are threatened by conversion for agricultural land in southwestern Ethiopia. The study aims to assess the impact of wetland cultivation on plant species richness, composition and soil fertility. Plant species richness and composition was investigated for 30 plots in each site of adjacent uncultivated and cultivated wetlands sites and total of 60 sampling plots were used. Soil samples were collected from 18 sample plots (9 in each site) selected using simple random method from plots used for plant survey. The results showed that cultivated sites have significantly higher (P<0.05) species richness, diversity and evenness indices than uncultivated wetlands. Though, this seems positive biological integrity in cultivated site, some ecologically and socioeconomically valuable wetland plant species were lost. Similarity of species (index 30.51%) between two sites was low. Moisture content, clay, organic carbon, total nitrogen, available phosphorous, cation exchange capacity (CEC), exchangeable K+ and Na+ were significantly (P<0.05) lower while silt, pH and electric conductivity (EC) were significantly (P<0.05) higher for cultivated site respect to uncultivated site. However, bulk density, sand, exchangeable Mg2+ and Ca2+ were not significantly (P>0.05) affected. Hence, planning wise use strategy for sustainable management of wetlands is essential.

 

Key words: Wetland cultivation, species composition, soil physico-chemical properties, South-Bench District.