Evaluating topsoil salinity via geophysical methods in rice production systems in the Vietnam Mekong Delta

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dc.contributor.authorNguyen, Van Hong
dc.contributor.authorGermer, Jörn
dc.contributor.authorAsch, Folkard
dc.date.accessioned2024-08-19T12:58:41Z
dc.date.available2024-08-19T12:58:41Z
dc.date.issued2023de
dc.description.abstractThe Vietnam Mekong Delta (VMD) is threatened by increasing saltwater intrusion due to diminishing freshwater availability, land subsidence, and climate change induced sea level rise. Through irrigation, saltwater can accumulate in the rice fields and decrease rice production. The study aims at evaluating topsoil salinity and examining a potential link between topsoil salinity and rice production systems in a case study in the Tra Vinh province of the VMD. For this, we applied two geophysical methods, namely, 3D electrical resistivity tomography (ARES II) and electromagnetic induction (EM38‐MK2). 3D ARES II measurements with different electrode spacings were compared with EM38‐MK2 topsoil measurements to evaluate their respective potential for monitoring topsoil salinity on an agricultural scale and the relationship between land‐use types and topsoil salinity. Results show that EM38‐MK2 is a rapid and powerful tool for obtaining high‐resolution topsoil salinity maps for rice fields. With ARES II data, 3D maps up to 40 m depth can be created, but compared with EM38‐MK2 topsoil maps, topsoil salinity was underestimated due to limitations in resolution. Salt contamination of above 300 mS m−1 was found in some double‐cropped rice fields, whereas in triple‐cropped rice fields salinity was below 200 mS m−1. Results clearly show a relation between topsoil salinity and proximity to the saline water sources; however, a clear link between rice production and topsoil salinity could not be established. The study proved that geophysical methods are useful tools for assessing and monitoring topsoil salinity at agricultural fields scale in the VMD.en
dc.identifier.urihttps://hohpublica.uni-hohenheim.de/handle/123456789/16133
dc.identifier.urihttps://doi.org/10.1111/jac.12676
dc.language.isoengde
dc.rights.licensecc_by-nc-ndde
dc.source1439-037Xde
dc.sourceJournal of Agronomy and Crop Science; Vol. 210, No. 1 (2023) e12676de
dc.subjectElectrical conductivityen
dc.subjectElectrical resistivityen
dc.subjectEMIen
dc.subjectERTen
dc.subjectSalinity stressen
dc.subject.ddc550
dc.titleEvaluating topsoil salinity via geophysical methods in rice production systems in the Vietnam Mekong Deltaen
dc.type.diniArticle
dcterms.bibliographicCitationJournal of agronomy and crop science, 210 (2023), 1, e12676. https://doi.org/10.1111/jac.12676 ISSN: 1439-037X
dcterms.bibliographicCitation.issue1
dcterms.bibliographicCitation.journaltitleJournal of agronomy and crop science
dcterms.bibliographicCitation.volume210
local.export.bibtex@article{Nguyen2023, url = {https://hohpublica.uni-hohenheim.de/handle/123456789/16133}, doi = {10.1111/jac.12676}, author = {Nguyen, Van Hong and Germer, Jörn and Asch, Folkard et al.}, title = {Evaluating topsoil salinity via geophysical methods in rice production systems in the Vietnam Mekong Delta}, journal = {Journal of agronomy and crop science}, year = {2023}, volume = {210}, number = {1}, }
local.export.bibtexAuthorNguyen, Van Hong and Germer, Jörn and Asch, Folkard et al.
local.export.bibtexKeyNguyen2023
local.export.bibtexType@article

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Institut für Tropische Agrarwissenschaften (Hans-Ruthenberg-Institut)