文献类型：期刊文献

中文题名：平原河网地区典型旱地面源污染排放系数时间变化特征及影响因素研究

英文题名：Temporal variation in discharge coefficients of non-point source pollution and its determinants in river-network areas in a plain

作者：端木家耀[1,2];陈诚[2];陈小华[2];沈根祥[1,2];张敏[2];郭春霞[2];王振旗[2];白玉杰[2];凌志雄[1,2];曹国民[1]

机构：[1]华东理工大学资源与环境工程学院,上海200237;[2]上海市环境科学研究院国家环境保护新型污染物环境健康影响评价重点实验室,上海200233

年份：2024

卷号：43

期号：3

起止页码：71

中文期刊名：灌溉排水学报

外文期刊名：Journal of Irrigation and Drainage

收录：CSTPCD;;Scopus;CSCD:【CSCD_E2023_2024】；

基金：上海市2021年度“科技创新行动计划”社会发展科技攻关项目(21DZ1202400);上海市生态环境局工作专项(H2023090168);上海市农业面源污染试点监测项目(SHZC20222679)。

语种：中文

中文关键词：平原河网;旱地;面源污染;协同监测;排放系数

外文关键词：plain river-network;dryland;non-point source pollution;collaborative monitoring;discharge coefficient

摘要：【目的】探明平原河网地区典型旱地离田排放系数的变化特征,为农业面源污染监测管理提供参考。【方法】以上海市崇明岛某典型旱地为研究对象,通过构建水文-水质协同监测系统,对旱地面源污染排放系数进行测算,明确排放系数的时间变化特征,分析排放系数的影响因素。【结果】日尺度下,氮、磷的离田排放系数变化范围分别为2.2~9843.9、0.08~667.0 g/(hm^(2)·d);月尺度下,氮、磷离田排放系数变化范围分别为0.02~17.2、0.001~1.04kg/(hm^(2)·m)。在降水产流事件中,氮离田排放系数与降水历时呈极显著正相关,磷离田排放系数与产流事件的总降水量、平均降水强度、最大小时降水强度极显著正相关。施肥后,氮日排放系数迅速增大,磷日排放系数无明显变化。各时间尺度下,氮排放系数与地表径流不存在显著相关性,磷排放系数与地表径流极显著正相关。【结论】氮、磷离田排放系数的日、月际变化幅度较大,氮离田排放系数易受施肥措施影响,磷离田排放系数则更易受降水和地表径流的影响。
【Objective】Discharge coefficient is a coefficient describing the discharge of non-point source pollution to water bodies.It is affected by many biotic and abiotic factors.In this paper,we analyze its variation in typical drylands in river network areas in a plain.【Method】The studied area is located at the Chongming Island,Shanghai.A hydrology-water quality collaborative monitoring system was constructed in the island,which can accurately calculate the discharge coefficient of non-point source pollution,identify its temporal variation,and analyze the underlying influencing factors.【Result】①Daily discharge coefficient of total nitrogen(TN)and total phosphorus(TP)is 2.2-9843.9 and 0.08-667.0 g/(hm^(2)·d),respectively;monthly discharge coefficients of TN and TP is 0.02-17.2 and 0.001-1.04 kg/(hm^(2)·m)respectively.②The total nitrogen discharge coefficient during precipitation runoff period is significantly positively correlated with duration of the precipitation,while the TP discharge coefficient is significantly positively correlated with the total precipitation,average precipitation intensity,and maximum hourly precipitation intensity.③Following fertilization,the daily discharge coefficient of TN increases rapidly,while the daily discharge coefficient of TP remains almost unchanged.④At different time scales,there is no notable correlation between TN discharge coefficient and surface runoff,whereas the TP discharge coefficient exhibits a significant positive correlation with surface runoff.【Conclusion】The discharge coefficients of nitrogen and phosphorus vary with time scales,with significant differences observed between daily and monthly discharge coefficients.TN discharge coefficient is primarily influenced by fertilization,whereas TP discharge coefficient is more sensitive to precipitation and surface runoff.