Water quality modification by land use types in watershed ecosystems of Southwestern Nigeria
  • Article Type: Research Article
  • Eurasian Journal of Biosciences, 2019 - Volume 13 Issue 2, pp. 1343-1351
  • Published Online: 30 Sep 2019
  • Article Views: 191 | Article Download: 96
  • Open Access Full Text (PDF)
AMA 10th edition
In-text citation: (1), (2), (3), etc.
Reference: Asinwa IO, Olajuyigbe SO. Water quality modification by land use types in watershed ecosystems of Southwestern Nigeria. Eurasia J Biosci. 2019;13(2), 1343-1351.

APA 6th edition
In-text citation: (Asinwa & Olajuyigbe, 2019)
Reference: Asinwa, I. O., & Olajuyigbe, S. O. (2019). Water quality modification by land use types in watershed ecosystems of Southwestern Nigeria. Eurasian Journal of Biosciences, 13(2), 1343-1351.

Chicago
In-text citation: (Asinwa and Olajuyigbe, 2019)
Reference: Asinwa, I. O., and S. O. Olajuyigbe. "Water quality modification by land use types in watershed ecosystems of Southwestern Nigeria". Eurasian Journal of Biosciences 2019 13 no. 2 (2019): 1343-1351.

Harvard
In-text citation: (Asinwa and Olajuyigbe, 2019)
Reference: Asinwa, I. O., and Olajuyigbe, S. O. (2019). Water quality modification by land use types in watershed ecosystems of Southwestern Nigeria. Eurasian Journal of Biosciences, 13(2), pp. 1343-1351.

MLA
In-text citation: (Asinwa and Olajuyigbe, 2019)
Reference: Asinwa, I. O. et al. "Water quality modification by land use types in watershed ecosystems of Southwestern Nigeria". Eurasian Journal of Biosciences, vol. 13, no. 2, 2019, pp. 1343-1351.

Vancouver
In-text citation: (1), (2), (3), etc.
Reference: Asinwa IO, Olajuyigbe SO. Water quality modification by land use types in watershed ecosystems of Southwestern Nigeria. Eurasia J Biosci. 2019;13(2):1343-51.

Abstract

The availability of quality water from natural sources such as rivers, largely depend on the land use systems around the watershed ecosystem of the water body. Ogun River watershed has experienced serious anthropogenic activities in which have influenced the Land Use Types (LUTs) and as had implications on habitat structure and water quality. This study evaluated the effect of different land use types on the status of the water from Ogun River.
The stretch of Ogun River was stratified into three ecological zones (guinea savannah, rain forest and swamp forests). Within in zone, three land use types were identified along the river course: Natural Forest (NF), Disturbed Forest (DF) and Farm land (FL).Water samples were collected at upper, middle and lower sections of the river course adjoining each land use type once in two months for 24 months. The Turbidity, Acidity, Electrical conductivity (EC), Biological Oxygen Demand (BOD), Dissolved Oxygen (DO), Total Dissolved Solid (TDS), Total Hardness, Calcium, Magnesium, Iron, Chloride, Nitrate, Phosphate, Total Coliform and Faecal Coliform of the water samples were determined using standard procedures. The seasonal variations in the water quality variables were assessed. Data were analysed using descriptive and inferential statistics.
Physico-chemical parameters and microbial constituents were significantly different (P>0.05) among land use types, ecological zones and between dry and rainy seasons. The Turbidity, Acidity, EC, BOD and TDS ranged from 0.69±0.07 NTU to 2.33±0.17 NTU, 0.14±0.08 mg/l to 0.44±0.04 mg/l. 135.33±0.35µs/cm to 120.15±0.12 µs/cm, 56.36±0.023 mg/ to 47.96±0.08 mg/l and 142.00±0.71 mg/l to 118.00±0.44 mg/l respectively with highest in the FL during rainy season and the lowest values during dry season in NF.
The significant differences between dry and rainy seasons show that runoff water contributes significantly to the contamination of water bodies with various sediments and higher proportion of chemical constituents. Generally, quality of water samples collected from NF was higher than those from DF and FL This inferred that vegetation plays a vital role in management of water qualities.

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