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Using visible and near infrared spectroscopy to estimate carbonates and gypsum in soils in arid and subhumid regions of Isfahan, Iran

Khayamim, Fatemeh and Wetterlind, Johanna and Khademi, Hossein and Robertson, Jean and Faz Cano, Angel and Stenberg, Bo (2015). Using visible and near infrared spectroscopy to estimate carbonates and gypsum in soils in arid and subhumid regions of Isfahan, Iran. Journal of near infrared spectroscopy. 23:3, 155-165
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Official URL: http://doi.org/10.1255/jnirs.1157

Abstract

Soils in arid and semi-arid regions are strongly affected by the accumulation of carbonates, gypsum and other, more soluble, salts. Carbonates and gypsum both have a considerable influence on soil properties, especially the chemical properties of the soil solution. The development of reliable, fast and inexpensive methods to quantify the amounts of carbonates and gypsum in soil is therefore
important. Visible and near infrared (vis-NIR) spectroscopy is a non-destructive, rapid and cheap method for measuring several soil properties simultaneously. However, research on vis-NIR spectroscopy in quantifying carbonates and gypsum is limited. Therefore, this study evaluated the efficiency of vis-NIR spectroscopy in quantifying carbonates and gypsum in surface soils using partial least-squares regression (PLSR) compared with standard laboratory methods and compared PLSR with a feature-specific method using continuum removal (CR). Carbonates and gypsum in a total of 251 sieved and air-dried topsoil samples from Isfahan Province in central Iran were measured by standard laboratory methods and vis-NIR spectroscopy (350–2500 nm wavelength range). In parallel, PLSR and the feature-specific method based on CR spectra were used to predict carbonates and gypsum. The PLSR model efficiency (E) for carbonates and gypsum in the validation set was 0.52 and 0.80, respectively. The PLSR model resulted in better predictions than the feature-specific method for both soil properties. Because of the unique absorption features of gypsum, which did not overlap with other soil properties, predictions of gypsum resulted in higher E values and lower errors than predictions of carbonates.

Authors/Creators:Khayamim, Fatemeh and Wetterlind, Johanna and Khademi, Hossein and Robertson, Jean and Faz Cano, Angel and Stenberg, Bo
Title:Using visible and near infrared spectroscopy to estimate carbonates and gypsum in soils in arid and subhumid regions of Isfahan, Iran
Series/Journal:Journal of near infrared spectroscopy (0967-0335)
Year of publishing :2015
Depositing date:24 March 2016
Volume:23
Number:3
Page range:155-165
Publisher:IM Publications
Associated Programs and Other Stakeholders:SLU - Research Areas for the Future > Future Agriculture
ISSN:0967-0335
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Published version
Full Text Status:Public
Agris subject categories.:P Natural resources > P31 Soil surveys and mapping
P Natural resources > P33 Soil chemistry and physics
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
Keywords:gypsum, carbonates, vis-NIR spectroscopy, continuum removal, partial least-squares regression (PLSR), soil, diffuse reflectance spectroscopy
URN:NBN:urn:nbn:se:slu:epsilon-e-3361
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-3361
Additional ID:
Type of IDID
DOI10.1255/jnirs.1157
ID Code:13228
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
External funders:FORMAS
Deposited By: Dr Bo Stenberg
Deposited On:05 Apr 2016 09:40
Metadata Last Modified:26 Jun 2017 06:29

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