摘要
为探究广西地区不同观测期生态沟对农业面源氮磷的削减效果,明确关键削减时段,根据2019年5月-2021年4月研究区实测资料,分析研究区干季、雨季、春季、夏季、秋季和冬季不同观测期氮磷浓度变化、氮素组成及削减效果。结果表明:整个监测期,研究区氨氮、硝态氮、总氮、总磷的平均浓度分别在5.62~19.84、2.38~4.00、15.30~28.18、0.50~1.26 mg/L之间;生态沟沿程监测点氨氮、硝态氮浓度占总氮浓度平均比例分别在0.04~0.90、0.02~0.66之间,且秋季、冬季、干季氨氮平均占比在0.41~0.90之间,显著大于其他季节;生态沟沿程各点对进水口的削减效率明显,氨氮、硝态氮、总氮、总磷平均单位去除率分别在0.31%~1.10%、0.07%~1.69%、0.31%~1.07%、0.30%~0.91%之间。秋冬季生态沟对氨氮、总氮、总磷削减效果显著,而在夏秋季对硝态氮削减效果最好。
In order to explore the effects of ecological ditch on reducing agricultural non-point source nitrogen and phosphorus in different observation periods and identify the key reduction period in Guangxi,nitrogen and phosphorus concentration was monitored at Dongcun Village in Xing’an County from May 2019 to April 2021.Based on the monitored data,the variations of nitrogen and phosphorus concentration,nitrogen composition and reduction efficiency were analyzed in different observation periods of dry seasons,rainy seasons,spring,summer,autumn and winter.The results showed that the average concentrations of ammonium nitrogen(NH_(4)^(+)-N),nitrate nitrogen(NO_(3)^(-)-N),total nitrogen(TN)and total phosphorus(TP)during the whole monitoring period were 5.62~19.84,2.38~4.00,15.30~28.18 and 0.50~1.26 mg/L,respectively.The average ratios of NH_(4)^(+)-N and NO_(3)^(-)-N concentration to TN concentration at the monitoring points along the ecological ditch were 0.04~0.90 and 0.02~0.66,respectively,and the average ratios of NH_(4)^(+)-N in autumn,winter and dry season was 0.41~0.90,which were significantly higher than those in other seasons.The reduction efficiency relative to the water inlet of each monitoring point along the ecological ditch was obvious,and the reduction efficiency of NH_(4)^(+)-N,NO_(3)^(-)-N,TN and TP were 0.31%~1.10%,0.07%~1.69%,0.31%~1.07%and 0.30%~0.91%,respectively.Autumn and winter were the key periods for the reduction of NH_(4)^(+)-N,TN and TP,while the reductions of NO_(3)^(-)-N were the highest in summer and autumn.
作者
方荣杰
邹传林
徐保利
代俊峰
张帅普
白凯华
FANG Rong-jie;ZOU Chuan-lin;XU Bao-li;DAI Jun-feng;ZHANG Shuai-pu;BAI Kai-hua(College of Environmental Science and Engineering,Guilin University of Technology,Guilin 541004,Guangxi,China;Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology,Guilin University of technology,Guilin 541004,Guangxi,China;Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area,Guilin University of technology,Guilin 541004,Guangxi,China)
出处
《中国农村水利水电》
北大核心
2022年第8期199-205,共7页
China Rural Water and Hydropower
基金
桂林市科学研究与技术开发计划重大专项(20180101-1)
广西科技计划项目(桂科AD19245056)
桂林理工大学博士科研启动基金(GUTQDJJ2019026)
国家重点研发计划(2019YFC0507502)。
关键词
面源污染
生态沟
氮磷排放
削减效应
non-point source pollution
ecological ditch
nitrogen and phosphorus export
reduction efficiency
