干旱区生态环境知识资源中心(Arid): Landscape-scale mapping of soil salinity with multi-height electromagnetic induction and quasi-3d inversion in Saharan Oasis, Tunisia

Arid

DOI	10.1016/j.agwat.2023.108330
	Landscape-scale mapping of soil salinity with multi-height electromagnetic induction and quasi-3d inversion in Saharan Oasis, Tunisia
	Farzamian, Mohammad; Bouksila, Fethi; Paz, Ana Marta; Santos, Fernando Monteiro; Zemni, Nessrine; Slama, Fairouz; Ben Slimane, Abir; Selim, Tarek; Triantafilis, John
通讯作者	Farzamian, M
来源期刊	AGRICULTURAL WATER MANAGEMENT
ISSN	0378-3774
EISSN	1873-2283
出版年	2023
卷号	284
英文摘要	Approximately half of Tunisia's irrigated area suffers from soil salinization due to arid and semi-arid conditions, irrigation with low-quality water, shallow and saline groundwater, and poor drainage. To manage salt-affected soils, efficient assessment methods are needed to map soil salinity in irrigated lands and to evaluate the performance of crop, water, and soil management strategies. In this study, apparent soil electrical conductivity (ECa) data were collected using a non-invasive electromagnetic induction (EMI) instrument, EM38, at different dipole orientations and heights from the soil surface, across the large agricultural area of Fatnassa Saharan (an oasis in southern Tunisia). Using a quasi-3d (q-3d) inversion algorithm, the spatial distribution of true soil electrical conductivity (sigma) was estimated and the potential for prediction of the electrical conductivity of the saturated soil paste extract (ECe) from inverted ECa data was evaluated, by establishing a linear regression (LR) between sigma and ECe collected at 51 reference points. The results indicate that the q-3d inversion of ECa measured at 0 and 0.2 m heights gives the best coefficient of determination (R2) between sigma and ECe (R2 = 0.61). Calibration procedure was performed afterward to develop a single calibration equation and an independent validation dataset to evaluate the robustness of the obtained calibration model. The calibration-validation procedure shows moderate strength (R2 = 0.56), good accuracy with the root mean square error (RMSE) of 2.94 dS/m, small bias with mean error (ME) of - 0.56 dS/m, and an acceptable Lin's concordance correlation coefficient (LCCC) of 0.80. Our study reveals the applicability of using the proposed methodology, based on inversion of ECa data collected at multiple heights and orientations to develop a single regional calibration and to efficiently estimate ECe at any depth across the irrigation district. Also, in the absence of recent devolved multicoil EMI instruments, ECa data measured using a single coil instrument but at different heights can provide sufficient data, required for inversion modelling and quantitative investigation of soil properties. The prediction results reveal that the soil of the oasis is moderately to severely saline which may adversely affect agricultural productivity and the sustainability of crop production.
英文关键词	Electromagnetic induction Tunisian Oasis Multi-heightsECa measurements Quasi-3d inversion 3d soil salinity mapping
类型	Article
语种	英语
开放获取类型	hybrid
收录类别	SCI-E
WOS记录号	WOS:001003601500001
WOS关键词	LATERALLY CONSTRAINED INVERSION ; JOINT-INVERSION ; WATER CONTENT ; IRRIGATION ; CONDUCTIVITY ; DUALEM-421 ; SALINIZATION ; DYNAMICS ; SOUTH
WOS类目	Agronomy ; Water Resources
WOS研究方向	Agriculture ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/395069
推荐引用方式 GB/T 7714	Farzamian, Mohammad,Bouksila, Fethi,Paz, Ana Marta,et al. Landscape-scale mapping of soil salinity with multi-height electromagnetic induction and quasi-3d inversion in Saharan Oasis, Tunisia[J],2023,284.
APA	Farzamian, Mohammad.,Bouksila, Fethi.,Paz, Ana Marta.,Santos, Fernando Monteiro.,Zemni, Nessrine.,...&Triantafilis, John.(2023).Landscape-scale mapping of soil salinity with multi-height electromagnetic induction and quasi-3d inversion in Saharan Oasis, Tunisia.AGRICULTURAL WATER MANAGEMENT,284.
MLA	Farzamian, Mohammad,et al."Landscape-scale mapping of soil salinity with multi-height electromagnetic induction and quasi-3d inversion in Saharan Oasis, Tunisia".AGRICULTURAL WATER MANAGEMENT 284(2023).