School of Geo and Spatial Sciences, Department of Geography and Environmental Sciences, North West University, Private Bag X2046, Mmabatho 2735, South Africa.
Int J Environ Res Public Health. 2018 Jun 5;15(6):1175. doi: 10.3390/ijerph15061175.
In the semi-arid environments of the North West province of South Africa the amount, timing, and distribution of rainfall is irregular, while water accessibility is a key factor in production. In line with this, a study was conducted to assess the impact of land use change on water quality and water depth within the sub-catchment areas of ephemeral ponds. To determine land use dynamics, 2004 and 2013 Landsat images were classified using maximum likelihood algorithm. Pond water quality was analysed for physical, chemical, and microbiological parameters using standard the American Public Health Association (APHA) methods. Multiple linear regression models were computed to determine relationships between land use changes and water quality parameters. Results revealed a reduction in grass cover, whereas built-up areas increased at the expense of bare land. All the values for the physical characteristics were higher than the recommended Department of Water Affairs (DWAF) and Food and Agriculture Organisation (FAO) limits, but chemical parameters, except cadmium, were within limits. Regression showed that bare areas have a positive effect on () in ephemeral pond water. The study highlights the suitability of pond water for irrigation to increase crop production and the effects of land use changes on ecosystems as critical for proper catchment planning, water resource management, and food security.
在南非西北部的半干旱环境中，降雨量的多少、时间和分布都不规则，而水资源的可获得性是生产的关键因素。因此，进行了一项研究，以评估土地利用变化对短暂性池塘汇水区内水质和水深的影响。为了确定土地利用动态，使用最大似然算法对 2004 年和 2013 年的 Landsat 图像进行了分类。使用美国公共卫生协会（APHA）标准方法分析了池塘水的物理、化学和微生物参数。计算了多元线性回归模型，以确定土地利用变化与水质参数之间的关系。结果表明，草地覆盖减少，而建设用地增加，取代了裸地。所有物理特性的值都高于建议的水务部（DWAF）和粮农组织（FAO）限值，但除镉外，化学参数都在限值内。回归表明，裸地对短暂性池塘水中的（）有积极影响。该研究强调了池塘水对灌溉的适宜性，以提高作物产量，以及土地利用变化对生态系统的影响，这对于适当的集水区规划、水资源管理和粮食安全至关重要。
