Assessing the influence of horticultural farming on selected water quality parameters in Maumau stream, a tributary of Nairobi River, Kenya

被引:2
|
作者
Wilson, Murithi M. [1 ]
Michieka, R. W. [1 ]
Mwendwa, S. M. [2 ]
机构
[1] Univ Nairobi, Coll Agr & Vet Sci, Dept Plant Sci & Crop Protect, POB 29053-00625, Nairobi, Kenya
[2] Univ Nairobi, Coll Agr & Vet Sci, Dept Land Resource Management & Agr Technol, POB 29053-00625, Nairobi, Kenya
关键词
Contamination; Water analysis; Horticultural activities; Land use; Water quality; LAND-USE; IMPACTS; BASIN; MIDDLE;
D O I
10.1016/j.heliyon.2021.e08593
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
This study aimed to determine the levels of contamination in Maumau stream as a result of horticultural activities in its vicinity. The stream was purposefully delineated into three blocks including upstream, midstream and downstream, where water samples were collected and analyzed for physicochemical attributes. Standard analytical procedures for water analysis were followed in laboratory analysis and the collected data was analyzed using Genstat software. Analyzed parameters include total dissolved solids (TDS), salinity, total suspended solids (TSS), sulphates (SO3-3), phosphates (PO3-3), nitrates (NO3-), fluoride (Fl(-)), turbidity, chloride (Cl-), magnesium (Mg+2), sodium (Na+), potassium (K+) and zinc (Zn+2). The results were presented in tables and a graph against WHO standards. All measured parameters showed significant differences (p=<0.001) among their means across the sampling sites and control. The pH did not show a clear trend from upstream through midstream to downstream. The concentrations of chloride decreased down the stream with control, midstream and downstream showing no statistical significance. Means of fluoride, magnesium, phosphates, sulphates, total soluble solids and zinc increased down the course of the stream. Increasing concentrations of the physicochemical parameters down the stream was attributed majorly to release and addition of agrochemicals to the stream from the nearby farms. A lucid knowledge of the nexus between land use and water quality was recommended as a prime management implication. In conclusion, the water quality of Maumau stream is being degraded by horticultural activities along the stream. Key policy actions including river pegging should be adopted to protect the water quality.
引用
收藏
页数:6
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