2.2.1 Root channels
The area of root channels was characterized using a 64-row multi-slice
spiral computed tomography CT scanner (Light Speed VCT, Jiangsu
Provincial Hospital of Integrated Traditional Chinese and Western
Medicine) (San, Caniego & García, 2017). The images (Figure A.1) were
processed by running the ”Intelligent Identification System for Pores in
Saline Soil” V1.0 (2018SR074781). The minimum pixel area was set as 1,
ie. the minimum identified root channel diameter was 0.298 mm.