Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2021WR030507 |
Antecedent conditions control thresholds of tile-runoff generation and nitrogen export in intensively managed landscapes Submitted for publication in Water Resources Research | |
Molly R. Cain; Dong Kook Woo; Praveen Kumar; Laura Keefer; Adam S. Ward | |
2022-01-27 | |
发表期刊 | Water Resources Research
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出版年 | 2022 |
英文摘要 | Threshold changes in rainfall-runoff generation commonly represent shifts in runoff mechanisms and hydrologic connectivity controlling water and solute transport and transformation. In watersheds with limited human influence, threshold runoff responses reflect interaction between precipitation event and antecedent soil moisture. Similar analyses are lacking in intensively managed landscapes where installation of subsurface drainage tiles has altered connectivity between the land surface, groundwater, and streams, and where application of fertilizer has created significant stores of subsurface nitrogen. In this study, we identify threshold patterns of tile-runoff generation for a drained agricultural field in Illinois and evaluate how antecedent conditions—including shallow soil moisture, groundwater table depth, and the presence or absence of crops—control tile response. We relate tile-runoff thresholds to patterns of event nitrate load observed across multiple storm events and evaluate how antecedent conditions control within-event nitrate concentration-discharge relationships. Our results demonstrate that an event tile-runoff threshold emerges relative to the sum of gross precipitation and indices of antecedent shallow soil moisture and antecedent below-tile groundwater moisture deficit, indicating that both shallow soil and below-tile storages must be filled to generate significant runoff. In turn, event nitrate load shows a linear dependence on runoff for most time periods, suggesting that subsurface nitrate export and storage can be estimated using runoff threshold relationships and long-term average nitrate concentrations. Finally, within-event nitrate concentration-discharge relationships are controlled by event size and the antecedent tile flow state because these factors dictate the sequence of flow path activation and tile connectivity over a storm event. |
领域 | 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/345993 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Molly R. Cain,Dong Kook Woo,Praveen Kumar,et al. Antecedent conditions control thresholds of tile-runoff generation and nitrogen export in intensively managed landscapes Submitted for publication in Water Resources Research[J]. Water Resources Research,2022. |
APA | Molly R. Cain,Dong Kook Woo,Praveen Kumar,Laura Keefer,&Adam S. Ward.(2022).Antecedent conditions control thresholds of tile-runoff generation and nitrogen export in intensively managed landscapes Submitted for publication in Water Resources Research.Water Resources Research. |
MLA | Molly R. Cain,et al."Antecedent conditions control thresholds of tile-runoff generation and nitrogen export in intensively managed landscapes Submitted for publication in Water Resources Research".Water Resources Research (2022). |
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