摘要
降雨径流过程是导致农田氮素流失的重要驱动力。在降水产流过程中,农田表层土壤的溶解态氮素会出现溶出现象,是农田溶解态氮素输出的重要途径。有效估算地表溶出量,有助于改进和完善非点源氮污染负荷估算方法。该研究根据大尺度模型溶解态污染负荷计算方法中冲刷渗出的概念,建立了适用于平原河网地区的旱田表土氮素溶出量估算方法;将该方法应用于江苏省大丰市典型平原河网区旱作农田,通过实时观测和模型估算,确定完整降水过程中表土氮素的冲刷渗出系数,并将估算结果与已有研究进行对比验证。该方法可为平原河网地区旱作农田表土氮素溶出量的估算模型和实验研究提供有益补充。
Rainfall-runoff processes are important driving factors of nitrogen loss in cropland.During the processes,dissolvable nitrogen in the topsoil of cropland gets dissolved and migrates into surface runoff.As a main way of dissolved nitrogen exporting from cropland,nitrogen dissolution from topsoil needs to be precisely estimated,which may help improve and perfect the estimation of non-point source nitrogen pollution load.Based on the concept of scouring and oozing coefficient in the calculation method of dissolved pollutant loads in the large scaled models,an approach to estimating nitrogen dissolution in plain river network areas was developed.A plot of dryland field typical of the plain river network area of Dafeng City in the north of Jiangsu Province was selected for test run of the proposed approach.The scouring and oozing coefficient with respect to topsoil nitrogen dissolution during a complete rainfall event was determined through real-time observation and modeling,and comparison was done with previous studies.The proposed approach is found to be a useful supplement for modeling and experimental studies on estimation of nitrogen release from topsoil of the dryland fields in the plain river network areas.
作者
蒲晓
刘训良
程红光
路路
程千钉
张瑞宁
李萌
PU Xiao;LIU Xun-liang;CHENG Hong-guang;LU Lu;CHENG Qian-ding;ZHANG Rui-ning;LI Meng(College of Resource Environment and Tourism,Capital Normal University,Beijing 100048,China;School of Environment,Beijing Normal University,Beijing 100875,China;Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China)
出处
《生态与农村环境学报》
CAS
CSCD
北大核心
2018年第3期276-281,共6页
Journal of Ecology and Rural Environment
基金
国家自然科学基金(41471396
41601581
41301529)
中国博士后科学基金(2016LH0002)
北京市自然科学基金(8172015)
关键词
非点源氮素
旱作土壤
地表溶出
冲刷渗出系数
平原河网区
non-point source nitrogen
dryland soil
N dissolution in topsoil
scouring and oozing coefficient
plain river network area
