摘要
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。
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 levelⅢ.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.
作者
张思毅
李晓涛
贺斌
郝贝贝
吕德鹏
梁鑫根
ZHANG Siyi;LI Xiaotao;HE Bin;HAO Beibei;LYU Depeng;LIANG Xingen(National-regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China,Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management,Institute of Eco-environmental and Soil Sciences,Guangdong Academy of Sciences,Guangzhou 510650,China;Forestry College of Henan Agriculture University,Zhengzhou 450002,China)
出处
《中国农业科技导报》
CAS
CSCD
北大核心
2024年第3期134-145,共12页
Journal of Agricultural Science and Technology
基金
国家自然科学基金项目(42177065,41930865,41977010)
广东省重点领域研发计划项目(2020B1111530001)
广东省科技计划项目(2019B121201004)
广东省基础与应用基础研究基金项目(2019A1515010628)
广东省科学院建设国内一流研究机构行动专项资金项目(2020GDASYL-20200301003)。
关键词
面源污染
污染通量
污染负荷
生态农业
小流域
non-point source pollution
pollution flux
pollution load
eco-agriculture
small watershed
作者简介
张思毅,E-mail:syzhang@soil.gd.cn;通信作者:贺斌,E-mail:bhe@soil.gd.cn。
