The Effects of Moisture Conditions-From Wet to Hyper dry-On Visible Near-Infrared Spectra of Danish Reference Soils
2014; Wiley; Volume: 78; Issue: 2 Linguagem: Inglês
10.2136/sssaj2012.0401
ISSN1435-0661
AutoresMaria Knadel, Fan Deng, Afsaneh Alinejadian, Lis Wollesen de Jonge, Per Møldrup, Mogens H. Greve,
Tópico(s)Soil and Unsaturated Flow
ResumoSoil Science Society of America JournalVolume 78, Issue 2 p. 422-433 Soil Physics The Effects of Moisture Conditions—From Wet to Hyper dry—On Visible Near-Infrared Spectra of Danish Reference Soils Maria Knadel, Corresponding Author Maria Knadel [email protected] Dep. of Agroecology Faculty of Science and Technology, Aarhus Univ., Blichers Allé 20 PO Box 50, DK-8830 Tjele, DenmarkCorresponding author ([email protected])Search for more papers by this authorFan Deng, Fan Deng Dep. of Agroecology Faculty of Science and Technology, Aarhus Univ., Blichers Allé 20 PO Box 50, DK-8830 Tjele, DenmarkSearch for more papers by this authorAfsaneh Alinejadian, Afsaneh Alinejadian Dep. of Soil Science Faculty of Agriculture, Shahr-e-Kord Univ, Shahr-e-Kord, IranSearch for more papers by this authorLis Wollesen de Jonge, Lis Wollesen de Jonge Dep. of Agroecology Faculty of Science and Technology, Aarhus Univ., Blichers Allé 20 PO Box 50, DK-8830 Tjele, DenmarkSearch for more papers by this authorPer Moldrup, Per Moldrup Dep. of Civil Engineering, Sohngårdsholmsvej 57 Aalborg Univ., DK-9000 Aalborg, DenmarkSearch for more papers by this authorMogens Humlekrog Greve, Mogens Humlekrog Greve Dep. of Agroecology Faculty of Science and Technology, Aarhus Univ., Blichers Allé 20 PO Box 50, DK-8830 Tjele, DenmarkSearch for more papers by this author Maria Knadel, Corresponding Author Maria Knadel [email protected] Dep. of Agroecology Faculty of Science and Technology, Aarhus Univ., Blichers Allé 20 PO Box 50, DK-8830 Tjele, DenmarkCorresponding author ([email protected])Search for more papers by this authorFan Deng, Fan Deng Dep. of Agroecology Faculty of Science and Technology, Aarhus Univ., Blichers Allé 20 PO Box 50, DK-8830 Tjele, DenmarkSearch for more papers by this authorAfsaneh Alinejadian, Afsaneh Alinejadian Dep. of Soil Science Faculty of Agriculture, Shahr-e-Kord Univ, Shahr-e-Kord, IranSearch for more papers by this authorLis Wollesen de Jonge, Lis Wollesen de Jonge Dep. of Agroecology Faculty of Science and Technology, Aarhus Univ., Blichers Allé 20 PO Box 50, DK-8830 Tjele, DenmarkSearch for more papers by this authorPer Moldrup, Per Moldrup Dep. of Civil Engineering, Sohngårdsholmsvej 57 Aalborg Univ., DK-9000 Aalborg, DenmarkSearch for more papers by this authorMogens Humlekrog Greve, Mogens Humlekrog Greve Dep. of Agroecology Faculty of Science and Technology, Aarhus Univ., Blichers Allé 20 PO Box 50, DK-8830 Tjele, DenmarkSearch for more papers by this author First published: 03 February 2014 https://doi.org/10.2136/sssaj2012.0401Citations: 35 All rights reserved. No part of this periodical may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or any information storage and retrieval system, without permission in writing from the publisher. Permission for printing and for reprinting the material contained herein has been obtained by the publisher. Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Abstract Changes in soil water content are known to affect soil reflectance. Even though it was suggested some time ago that the phenomenon of increased forward scattering due to the presence of water in the soil is related to water film thickness and matric potential, there has been no detailed investigation of this in any studies. The effects of moisture conditions on visible near-infrared (vis-NIR) spectra of four representative soils in Denmark have been assessed as a function of both water film thickness (expressed as the number of molecular layers) and matric potential. Complete water retention curves, from wet (pF 0.3, pF = log(|j|), where φ is the matric potential in cm) to hyper dry end (oven-dried and freeze-dried soil), were obtained by initial wetting followed by successive draining and drying of soil samples, performing NIR measurements at each step. Soil reflectance was found to decrease systematically, yet not proportionally, with decreasing matric potential and increasing molecular layers. The changes in molecular layers were best captured by the soil reflectance of clay-rich soils. Here the largest increase in reflectance occurred between pF 3 and 4, caused by the shift from capillary to adsorptive surface forces. In support of this, the smallest changes in reflectance were seen in the sandiest soil. Freeze drying the soil highest in organic C increased reflectance, possibly due to an alteration in organic matter during freezing. The different reflectance behavior of soil with a higher organic C content may be linked to differences in the amount, but also the quality (higher hydrophobicity) of the organic matter. However, this needs to be confirmed in further studies. Citing Literature Volume78, Issue2March-April 2014Pages 422-433 RelatedInformation
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