Unveiling the determinants of the spatial variability of nitrogen sources use in the Lake Victoria basin, East Africa

IF 5.4 Q1 ENVIRONMENTAL SCIENCES Environmental and Sustainability Indicators Pub Date : 2024-09-19 DOI:10.1016/j.indic.2024.100484
Catherine Mathenge , Stephen Mureithi , Soul-Kifouly Midingoyi , Benjamin Nyilitya , Geoffrey Kironchi , Cargele Masso
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Abstract

As nitrogen pollution increasingly threatens water quality in the Lake Victoria Basin, it is essential to investigate the spatial factors influencing nitrogen source use. Understanding these determinants is crucial to inform effective strategies to combat eutrophication, enhance nutrient management, ensure food security and promote sustainable ecological development. This study investigated spatial variation of N sources, the farmers' socio-demographic and farm characteristics factors influencing farmers' choice of nitrogen sources. Data was collected from 1500 farmers between October and December 2020. The farmers were randomly selected in Kenya, Rwanda, Uganda, Burundi and Tanzania country sub-basins within the Lake Victoria basin (LVB). Spatial autocorrelation was used to evaluate the spatial variation of the nitrogen sources while the Optimized Parameter Geographical Detector (OPGD) model was used to identify the factors influencing the choice or use of N sources. The OPDG results indicate that the country of residence and livestock ownership are the primary factors accounting for 31.9% and 22.1% of the variation in nitrogen sources across the entire Lake Victoria Basin, respectively. The major sub-basin factors influencing the use of N sources were both farm characteristics (types of crops grown and farm size) and social socio-demographic factors of the farmer (education). These findings highlight the need for tailored strategies, accounting for geographical variations, farm characteristics and socio-demographic factors are essential when formulating nitrogen management strategies and policies at local and regional scales within the LVB.
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揭示东非维多利亚湖流域氮源利用空间变化的决定因素
随着氮污染日益威胁维多利亚湖盆地的水质,研究影响氮源利用的空间因素至关重要。了解这些决定因素对于制定有效的策略以应对富营养化、加强养分管理、确保粮食安全和促进可持续生态发展至关重要。本研究调查了氮源的空间变化、影响农民选择氮源的农民社会人口和农场特征因素。研究在 2020 年 10 月至 12 月期间收集了 1500 名农民的数据。这些农民是在维多利亚湖流域(LVB)内的肯尼亚、卢旺达、乌干达、布隆迪和坦桑尼亚国家分流域随机选取的。利用空间自相关性评估氮源的空间变化,同时利用优化参数地理检测器(OPGD)模型确定影响氮源选择或使用的因素。OPDG 结果表明,居住国和牲畜拥有量是主要因素,分别占整个维多利亚湖流域氮源变化的 31.9% 和 22.1%。影响氮源使用的主要次流域因素是农场特征(种植作物类型和农场规模)和农民的社会人口因素(教育程度)。这些研究结果突出表明,在制定维多利亚湖流域地方和区域范围的氮管理战略和政策时,必须考虑地理差异、农场特征和社会人口因素,制定有针对性的战略。
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来源期刊
Environmental and Sustainability Indicators
Environmental and Sustainability Indicators Environmental Science-Environmental Science (miscellaneous)
CiteScore
7.80
自引率
2.30%
发文量
49
审稿时长
57 days
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