摘要
选择太滆运河流域水稻田开展非点源类型源试验,监测水稻生长期田间水深和水质,以及降雨-径流-产污过程,并调查水田灌溉及施肥等农田管理措施.基于观测的降雨量、水田出流流量及水质数据,计算次降雨平均质量浓度(EMCs),并结合田间水深和水质变化规律及农田管理措施,分析水稻田径流污染特征及其影响因素.结果表明,降雨量、降雨强度与EMCs之间没有明显的相关关系,EMCs与稻田中污染物质的质量存在正相关关系.在水稻生长期,水稻田水质变化较大的时间点主要发生在施肥后.水稻田田埂最低出口高度在水稻生长期存在变化,增加了水稻田非点源污染流失的复杂性,模拟水稻田的产流和非点源流出过程不能忽略这一重要因素.
A series of rainfall-runoff experiments were conducted in paddy field in the Taige Canal watershed in the Tai Lake basin.Variation of water depth and water quality in the paddy fields during growing seasons,rainfall-runoff pollutant loss and farmland management such as irrigation and fertilization were monitored and investigated.Event mean mass concentrations（EMCs） were estimated based on observed rainfall,runoff and water quality data,and characteristics and effect factors on paddy field runoff pollution were analyzed.No obvious correlation among rainfall depth,rainfall intensity and EMCs was found,but EMCs was positively correlated to pollutants in paddy fields.During the growing seasons,pollutant concentrations in paddy field varied greatly especially after fertilization.Variation of minimum height of field ridge during whole growing seasons increased the complexity of non-point source pollution,indicating that influences of minimum field ridge variation on runoff generation and pollutant losses could not be neglected when hydrological and nonpoint source processes in paddy fields were simulated.
出处
《北京师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2012年第5期453-457,共5页
Journal of Beijing Normal University(Natural Science)
基金
国家水体污染控制与治理科技重大专项资金资助项目(2009ZX07526-005)
中央高校基本科研业务费专项资金资助项目
