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广西高山河谷区乡(镇)饮用水水源地农业非点源特征研究
作者: 李相林1  谢 华1 *  杨瑞刚2  余孟好2  
单位: (1 广西环境保护科学研究院  南宁 530022;2 广西高校西江流域生态环境与一体化发展协同创新中心  
关键词: 高山河谷区  饮用水水源地  农业非点源  等标污染负荷  广西田林县  
分类号:X820.2
出版年,卷(期):页码:2016 ,47 ( 1 ): 页码:48-54
摘要:

【目的】开展广西高山河谷区乡(镇)饮用水水源地农业非点源特征研究,为今后广西乡镇饮用水水源地的规范化、常态化管理提供参考依据及数据支撑。【方法】以广西田林县为例,根据田林县乡(镇)地形地貌特点,选取位于同一流域的6个饮用水水源地,采样分析水源地取水口处水质,调查水源地环境现状及污染源分布情况;采用等标污染负荷法估算不同农业非点源类型的比重,分析影响水源地水质的主要污染源和污染物。【结果】6个水源地中,取水口沿岸农业植被分布较多的3个水源地水质出现轻微超标现象,粪大肠菌群超标0.20~0.25倍、总磷超标0.20倍、总氮超标2.00倍;其余3个水源地取水口位于流域山腰上,无农业非点源分布,其水质达到Ⅱ类和Ⅲ类标准,水质达标。田林县乡(镇)饮用水水源地农业非点源主要集中分布在地势较低的河谷地带,其中农田径流污染源等标污染负荷比最高,其次是分散式畜禽养殖污染源和农村生活污染源;污染中总磷的等标污染负荷比最高,其次是总氮。【结论】广西高山河谷区乡(镇)饮用水水源地水质与其所在区域的农业非点源特征有一定关联,因此应重点加强对乡(镇)农田径流污染源的防控,以确保水源地水质安全。

【Objective】The agricultural non-point pollution feature of drinking water source in alpine valley region of Guangxi was studied, in order to provide data and scientific references for standardization and normalization management of drinking water source in villages and towns of Guangxi in future. 【Method】Taking Tianlin county, Guangxi as example, 6 drinking water sources in same river basin were selected according to Tianlin county township topographical features. Then the water quality of water point were analysed, and the water environment status and pollution source distribution were investigated. The proportions of different types of agricultural non-point sources were estimated by equal standard pollution load method, so as to analyze main pollution sources and pollutants affecting water quality of water source. 【Result】The results showed that, among 6 drinking water sources,there were 3 drinking water sources whose water quality had exceeded standard slightly to be found, which had more agricultural vegetation distributed along water point. The fecal coliforms , total phosphorus(TP) and total nitrogen(TN) were 0.20-0.25,  0.20 and 2.00 times more than national standard, respectively. However, as for other 3 drinking water sources located in the mountainside without agricultural non-point source distribution, the water quality reached class II and class III of national standard, which met safety standards for drinking. The agricultural non-point drinking water sources of villages and towns was distributed in the low-lying valley region of Tianlin county. Moreover, the ratio of equal standard pollution load in farmland runoff pollution sources was the highest, followed by those in scattered livestock and poultry breeding pollution sources and rural life pollution sources. And the ratio of equal standard pollution load in TP was the highest, followed by that in TN. 【Conclusion】In order to ensure water safety, the prevention and control of farmland runoff pollution sources should be strengthed.

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