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Changes in pore networks and readily dispersible soil following structure liming of clay soils

Bölscher, Tobias and Koestel, John and Etana, Ararso and Ulen, Barbro and Berglund, Kerstin and Larsbo, Mats (2021). Changes in pore networks and readily dispersible soil following structure liming of clay soils. Geoderma. 390 , 114948
[Research article]

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Abstract

Structure liming aims to improve soil structure (i.e., the spatial arrangement of particles and pores) and its stability against external and internal forces. Effects of lime application on soil structure have received considerable interest, but only a few studies have investigated effects on macro- and mesopore networks. We used X-ray computed tomography to image macropore networks (phi >= 0.3 mm) in soil columns and mesopores (phi > 0.01 mm) in soil aggregates from three field sites with (silty) clay soils after the application of structure lime (3.1 t ha(-1) or 5 t ha(-1)- of CaO equivalent). Segmented X-ray images were used to quantify soil porosity and pore size distributions as well as to analyse pore architecture and connectivity metrics. In addition, we investigated the amount of readily dispersible soil particles. Our results demonstrate that structure liming affected both, macropore networks and amounts of readily dispersible soil to different degrees, depending on the field site. Significant changes in macropore networks and amounts of readily dispersible soil after lime application were found for one of the three field sites, while only some indications for similar changes were observed at the other two sites. Overall, structure liming tended to decrease soil macroporosity and shift pore size distribution from larger (epsilon( >100 mm) ) and medium sized macropores (epsilon( 0.3-1.0) (mm)) towards smaller macropores (epsilon( 0.1-0.3) (mm)). Furthermore, liming tended to decrease the critical and average pore diameters, while increasing the surface fractal dimension and specific surface area of macropore network. Structure liming also reduced the amounts of readily dispersible soil particles. We did not find any changes in mesopore network properties within soil aggregates or biopore networks in columns and aggregates. The effects of lime on macropore networks remain elusive, but may be caused by the formation of hydrate phases and carbonates which occupy pore space.

Authors/Creators:Bölscher, Tobias and Koestel, John and Etana, Ararso and Ulen, Barbro and Berglund, Kerstin and Larsbo, Mats
Title:Changes in pore networks and readily dispersible soil following structure liming of clay soils
Series Name/Journal:Geoderma
Year of publishing :2021
Volume:390
Article number:114948
Number of Pages:12
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, Structure liming, Pore space, Dispersible clay, X-ray computed tomography
URN:NBN:urn:nbn:se:slu:epsilon-p-111452
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-111452
Additional ID:
Type of IDID
DOI10.1016/j.geoderma.2021.114948
Web of Science (WoS)000625877000002
ID Code:23281
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:16 Apr 2021 08:44
Metadata Last Modified:16 Apr 2021 08:51

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