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提高模拟酸盐出口的时空变化和流量贡献的模型能力,以模拟干排水区的酸盐出口

Peiyu Cao¹, Chaoqun Lu¹, William Crumpton¹

¹Department of Ecology, Evolution, and Organismal Biology, Iowa State University, 251 Bessey Hall, 2200 Osborn Dr., Ames, IA 50011, USA.

|August 31, 2023

概括

确定农业流域中酸盐- (NO3-N) 损失途径是减少负荷的关键. 地下流,特别是排水,主导NO3-N出口,受管理和景观特征的影响.

科学领域:

环境科学环境科学
水文学的水文学
农业科学农业科学

背景情况:

来自农业流域的酸 (NO3-N) 损失是一个主要的环境问题,影响水质和生态系统健康.
有效的降低负荷的策略需要了解NO3-N出口的复杂的时空动态,受生物地化学过程和水文连接的影响.
现有的模型往往过于简化了自然和人类管理的过程,限制了对水和NO3-N动态的准确预测.

研究的目的:

改进一个空间分布的水生态模型 (DLEM-捕获) 以更好地模拟农业流域的水文和生物地球化学循环.
将改进的模型应用于美国爱荷华州的排水流域,以确定占主导地位的NO3-N损失途径,热点和热期.
评估采水区特征和农业管理实践对NO3-N浸和装载的影响.

主要方法:

增强DLEM捕获模型,以更好地表示水留 (雪,土壤粗,耕种坑) 和排水.
将改进的模型应用于爱荷华州的四个多样化,排水的农业水域,模拟每日和每月的水排放,NO3-N度和从2015年到2019年的负载.
量化统计分析,以对测量数据验证模型性能.

主要成果:

改进的DLEM-采集模型准确地复制了所有四个采集区的观察到的每日/每月排水量和NO3-N动态.
地下流 (流+侧流) 被确定为排放 (70-75%) 和NO3-N负载 (77-82%) 的主要途径.
排水和横流的捕捞区特定贡献是显著的,受排水面积百分比和养殖坑的存在的影响. 农业管理和景观特征极大地影响了NO3-N空间分布.

结论:

模型对水和排水的改进改善了每日排放和NO3-N出口模拟,而农业管理的改进主要影响了NO3-N出口预测.
精确的水质动态模拟和有效的营养减少策略需要描述流域特性,管理实践,流量特定的NO3-N运动和空间异质性.
该研究强调了地下流动和景观特征的关键作用,例如农业流域中养的坑,NO3-N出口,为有针对性的保护工作提供信息.

关键词:

农业管理农业管理亚酸盐负载的使用量路径-来源归属的归因草原的坑洞都是草原的坑洞.带有瓦排水的水库.水质建模水质建模

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