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Approaches to delineate aggregates in intact soil using X-ray imaging

Koestel, John and Fukumasu, Jumpei and Garland, Gina and Larsbo, Mats and Nimblad Svensson, David (2021). Approaches to delineate aggregates in intact soil using X-ray imaging. Geoderma. 402 , 115360
[Research article]

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Abstract

Soil structure refers to the spatial arrangement of primary soil particles and pores, and is known to influence a variety of soil functions including carbon sequestration and water holding capacity. At present, research in this field is often divided, focusing either on pores where pore networks are investigated in undisturbed soil or on solids where isolated soil aggregates are commonly studied. The choice of approach depends on the needs and traditions in different disciplines of soil science. While there is much debate regarding how well these viewpoints relate to each other, there have been only marginal research efforts undertaken to compare them quantitatively. In this study, we presented and evaluated methods to identify 3-D subunits in X-ray images of eight undisturbed soil samples that we interpreted as macroaggregates, and compared these to to results from drop-shatter tests. Here, we exploited the cohesive forces of water that induces shrinkage cracks under drying. Despite promising trends, comparisons between image and drop-shatter test derived aggregate properties remained inconclusive. Nevertheless, our results encourage further investigations on larger sample sets and different observation scales. The here presented and discussed aggregate delineation methods illustrate an approach to harmonize soil structure characterization in terms of both pore-networks and soil aggregation. For example, respective extended approaches may be developed to evaluate the locations of microaggregates within macroaggregates.

Authors/Creators:Koestel, John and Fukumasu, Jumpei and Garland, Gina and Larsbo, Mats and Nimblad Svensson, David
Title:Approaches to delineate aggregates in intact soil using X-ray imaging
Series Name/Journal:Geoderma
Year of publishing :2021
Volume:402
Article number:115360
Number of Pages:11
Publisher:ELSEVIER
ISSN:0016-7061
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
Keywords:Soil structure, Soil aggregate, X-ray imaging, Pore network, Morphology, Dropshatter test
URN:NBN:urn:nbn:se:slu:epsilon-p-113475
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-113475
Additional ID:
Type of IDID
DOI10.1016/j.geoderma.2021.115360
Web of Science (WoS)000688581600017
ID Code:25283
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
Deposited By: SLUpub Connector
Deposited On:09 Sep 2021 10:26
Metadata Last Modified:09 Sep 2021 10:31

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