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DOI	10.1002/ldr.3317
	Mapping soil salinity using electromagnetic conductivity imaging-A comparison of regional and location-specific calibrations
	Farzamian, Mohammad 1; Paz, Maria Catarina 1; Paz, Ana Marta 2; Castanheira, Nadia Luisa 2; Goncalves, Maria Conceicao 2; Monteiro Santos, Fernando A.1; Triantafilis, John 3
通讯作者	Paz, Maria Catarina
来源期刊	LAND DEGRADATION & DEVELOPMENT
ISSN	1085-3278
EISSN	1099-145X
出版年	2019
卷号	30 期号:12 页码:1393-1406
英文摘要	Soil salinization limits agricultural productivity and can ultimately cause desertification and land abandonment. One approach to assess soil salinity over large areas efficiently is to use electromagnetic instruments to measure the soil apparent electrical conductivity (ECa, mS m(-1)). ECa data can be then inverted to generate electromagnetic conductivity images (EMCIs), which provide the vertical distribution of the soil electrical conductivity (sigma, mS m(-1)). In this study, we collected ECa data using an EM38 instrument across four locations with different levels of salinity in an important agricultural area of alluvial origin in Portugal. Using an inversion algorithm, we generated EMCIs and evaluated the potential for prediction of the electrical conductivity of the saturated soil paste extract (ECe). The main aim of our study is to compare regional and location-specific calibrations in terms of ability to predict ECe from EMCIs. The results showed that the regional calibration predicted ECe unbiased, precisely (root mean square error [RMSE] = 2.54 dS m(-1)), and with strong concordance (0.93). The location-specific calibration also predicted ECe unbiased, precisely (RMSE = 1.67 dS m(-1)), and with strong concordance (0.97). We conclude that the location-specific calibration has slightly better prediction results, but the regional calibration is more practical for mapping soil salinity in the study area because it can be used at any new location without the need for new calibration. The prediction results at locations 3 and 4 show high to severely high soil salinity, which can compromise agricultural productivity. Therefore, monitoring soil salinity is required to conserve and improve agricultural productivity in the south of the study area.
英文关键词	electromagnetic method inversion regional and location-specific calibrations soil electrical conductivity imaging soil salinity mapping
类型	Article
语种	英语
国家	Portugal ; Australia
收录类别	SCI-E
WOS记录号	WOS:000475471300001
WOS关键词	LATERALLY CONSTRAINED INVERSION ; DRIP IRRIGATION SYSTEM ; JOINT-INVERSION ; INDUCTION DATA ; RAPID METHOD ; INSTRUMENT ; DUALEM-421 ; MODELS ; EM38
WOS类目	Environmental Sciences ; Soil Science
WOS研究方向	Environmental Sciences & Ecology ; Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/217471
作者单位	1.Univ Lisbon, Inst Dom Luiz, Fac Ciencias, Ed C1,Piso 1, P-1749016 Lisbon, Portugal; 2.Inst Nacl Invest Agr & Vet, Sistemas Agr Florestais & Sanidade Vegetal, Ave Republ, P-2780157 Oeiras, Portugal; 3.UNSW Sydney, Sch Biol Earth & Environm Sci, Sydney, NSW 2052, Australia
推荐引用方式 GB/T 7714	Farzamian, Mohammad,Paz, Maria Catarina,Paz, Ana Marta,et al. Mapping soil salinity using electromagnetic conductivity imaging-A comparison of regional and location-specific calibrations[J],2019,30(12):1393-1406.
APA	Farzamian, Mohammad.,Paz, Maria Catarina.,Paz, Ana Marta.,Castanheira, Nadia Luisa.,Goncalves, Maria Conceicao.,...&Triantafilis, John.(2019).Mapping soil salinity using electromagnetic conductivity imaging-A comparison of regional and location-specific calibrations.LAND DEGRADATION & DEVELOPMENT,30(12),1393-1406.
MLA	Farzamian, Mohammad,et al."Mapping soil salinity using electromagnetic conductivity imaging-A comparison of regional and location-specific calibrations".LAND DEGRADATION & DEVELOPMENT 30.12(2019):1393-1406.