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南方库区生态农业小流域面源污染特征

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  • 国家科技期刊平台
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为研究生态农业小流域的氮、磷减排效果,以广东省英德市大站镇长湖水库粉洞生态小流域为研究对象,通过野外监测和实验室分析等方法研究小流域面源氮、磷污染物含量和污染负荷输出特征,确定关键源区,评价生态农业的减排效果.结果表明,流域内水体受污染程度低,大部分都在Ⅲ类水质范围内;总氮、总磷是流域内主要污染负荷;流域地表水氮素组成主要以溶解态氮为主(＞50％),溶解态氮以硝态氮为主;关键源区有水土流失、养鹅场、居民点、养猪场、耕地.研究期间流域总氮负荷为345.22 kg,总磷负荷为69.47 kg,入河污染负荷强度低,总氮和总磷的入河系数分别为0.16和0.63.以上结果表明,生态农业小流域氮、磷减排效果显著,且流域氮、磷消纳能力强,使得流域内氮、磷污染负荷较低,水质较好,生态农业具有推广价值.
Characteristics of Non-point Source Pollution in Ecological Agriculture Watershed of South Reservoir
In order to investigate the characteristics of nitrogen and phosphorus emission in a small ecological agriculture watershed,the small eco-agricultural Fendong watershed of Changhu Reservoir in Dazhan town,Yingde City,Guangdong province,was chosen as the research region,the content and diffuse pollution characteristics of nitrogen and phosphorus,the identification of the critical source area,and the effects of eco-agriculture on reduction of nitrogen and phosphorus emission were studied by means of field observations and laboratory measurements.The results showed that the water pollution was low at the watershed scale,most of the water quality were not worse than level Ⅲ.Total nitrogen(TN)and total phosphorus(TP)were the main pollution loads in the watershed,and the dissolved nitrogen was the main nitrogen composition(＞50％).The critical source areas included soil erosion,goose farms,residential areas,and pig farms.The total loads of TN and TP were 345.22 and 69.47 kg during the study period,respectively.The pollution load intensity into the river was low,and the inflow coefficients of TN and TP were 0.16 and 0.63,respectively.Above results indicated the effect of nitrogen and phosphorus emission reduction in the small ecological agriculture watershed was remarkable,and the absorption capacity of nitrogen and phosphorus was strong,which made the nitrogen and phosphorus pollution load low and the water quality good,so ecological agriculture should be worth popularized and widely applied.

non-point source pollutionpollution fluxpollution loadeco-agriculturesmall watershed

张思毅、李晓涛、贺斌、郝贝贝、吕德鹏、梁鑫根

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广东省科学院生态环境与土壤研究所,华南土壤污染控制与修复国家地方联合工程研究中心,广东省农业环境综合治理重点实验室,广州 510650

河南农业大学林学院,郑州 450002

面源污染 污染通量 污染负荷 生态农业 小流域

国家自然科学基金国家自然科学基金国家自然科学基金广东省重点领域研发计划项目广东省科技计划项目广东省基础与应用基础研究基金广东省科学院建设国内一流研究机构行动专项资金项目

4217706541930865419770102020B11115300012019B1212010042019A15150106282020GDASYL-20200301003

2024

10.13304/j.nykjdb.2022.0707

中国农业科技导报
中国农村技术开发中心

中国农业科技导报

CSTPCD北大核心
影响因子：1.252
ISSN：1008-0864
年,卷(期)：2024.26(3)
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