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RESEARCH ARTICLE

Effect of long-term irrigation and tillage practices on X-ray CT and gas transport derived pore-network characteristics

Karin Müller https://orcid.org/0000-0002-5224-0984 A , Nicola Dal Ferro https://orcid.org/0000-0001-7957-3212 B G , Sheela Katuwal C , Craig Tregurtha D , Filippo Zanini E , Simone Carmignato E , Lis Wollesen de Jonge C , Per Moldrup F and Francesco Morari B
+ Author Affiliations
- Author Affiliations

A Plant & Food Research, Production Footprints, Bisley Road, Hamilton 3214, New Zealand.

B Department of Agronomy, Food, Natural Resources, Animals and Environment, Agripolis, University of Padova, Viale Dell’Università 16, 35020 Legnaro, Italy.

C Department of Agroecology Aarhus University, Blichers Allé 20, PO Box 50, DK-8830 Tjele, Denmark.

D Plant & Food Research, Soil Water and Environment, Gerald Street, Lincoln 7608, New Zealand.

E Department of Management and Engineering, University of Padova, Stradella San Nicola 3, 36100 Vicenza, Italy.

F Department of Civil Engineering, Aalborg University, Thomas Manns Vej 23, Aalborg Ø, 9200-Denmark.

G Corresponding author. Email: nicola.dalferro@unipd.it

Soil Research 57(6) 657-669 https://doi.org/10.1071/SR18210
Submitted: 22 July 2018  Accepted: 19 September 2018   Published: 16 November 2018

Abstract

The gas transport parameters, diffusivity and air-filled porosity are crucial for soil aeration, microbial activity and greenhouse gas emission, and directly depend on soil structure. In this study, we analysed the effect of long-term tillage and irrigation practices on the surface structure of an arable soil in New Zealand. Our hypothesis was that topsoil structure would change under intensification of arable production, affecting gas exchange. Intact soil cores were collected from plots under intensive tillage (IT) and direct drill (DD), irrigated or rainfed. In total, 32 cores were scanned by X-ray computed tomography (CT) to derive the pore network >30 µm. The cores were then used to measure soil-gas diffusivity, air-permeability and air-filled porosity of pores close to the resolution of the X-ray CT scans, namely ≥30 µm. The gas measurements allow the calculation of pore-network connectivity and tortuosity parameters, which were compared with the CT-derived structural characteristics. Long-term irrigation had little effect on any of the parameters analysed. Total porosity tended to be lower under IT than DD, whereas the CT-derived porosity was comparable. Both the CT-derived mean pore diameter (MPD) and other morphological parameters, as well as gas measurement-derived parameters, highlighted a less developed structure under IT. The differences in the functional pore-network structure were attributed to SOC depletion and the mechanical disturbance through IT. Significant correlations between CT-derived parameters and functional gas transport parameters such as tortuosity and MPD were found, which suggest that X-ray CT could be useful in the prediction of gas transport.

Additional keywords: carbon depletion, Dexter index, intensive tillage, P-parameter, soil organic carbon, soil structure.


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