Modeling water and nitrogen dynamics from processing tomatoes under different management scenarios in the San Joaquin Valley of California

The Southern San Joaquin Valley (SSJV), California. Four representative soil types were evaluated. Evaluation of regional scale hydrology and nitrogen (N) fate and transport requires a robust modeling framework that considers critical local scale environmental conditions and crop root zone physical...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Journal of hydrology. Regional studies 2022-10, Vol.43, p.101195, Article 101195
Hauptverfasser: Raij-Hoffman, Iael, Miller, Kenneth, Paul, George, Yimam, Yohannes, Mehan, Sushant, Dickey, John, Harter, Thomas, Kisekka, Isaya
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:The Southern San Joaquin Valley (SSJV), California. Four representative soil types were evaluated. Evaluation of regional scale hydrology and nitrogen (N) fate and transport requires a robust modeling framework that considers critical local scale environmental conditions and crop root zone physical processes. Two widely used yet conceptually and mechanistically different models, HYDRUS(2D/3D) and SWAT (Soil and Water Assessment Tool), were used to investigate water and N dynamics in processing tomato fields across a range of soil types and management scenarios over a 30-year period in the SSJV. This study implements a framework to evaluate a regional scale model against a field scale model and provides a framework for assessing percolation and N transport results from regional scale simulations in the absence of extensive field observations. Field scale models developed in HYDRUS (2D/3D) produced similar results to a regional-scale SWAT model in four specific soils in terms of responses to percolation and N losses as a function of varying N fertilizer and irrigation management practices. This model-to-model agreement at the local scale provides confidence in region-scale hydrological and N fate and transport findings, particularly in the absence of extensive field observations. Both models suggest that promoting conservation practices targeting the optimization of irrigation and fertilizer-N management would have a large impact in protecting regional groundwater quality. [Display omitted] •SWAT and HYDRUS hydrological models were compared in the San Joaquin Valley, CA.•Optimum management of both nitrogen and water was necessary to minimize N losses.•Models successfully assessed impacts of changes in management practices on N losses.•At the annual time scale both SWAT and HYDRUS (2D/3D) give comparable results.
ISSN:2214-5818
2214-5818
DOI:10.1016/j.ejrh.2022.101195