These are few published works on this technique. I am also working on it.
Divakara, B.N., Kumar, B.M., Balachandran, P.V. and Kamalam, N.V., 2001. Bamboo hedgerow systems in Kerala, India: Root distribution and competition with trees for phosphorus. Agroforestry systems, 51(3), pp.189-200.
I am sorry, I can not comment this method as I have never used it. I usually use the Voronoi trench. See for instance
Levillain, J., Thongo M’Bou, A., Deleporte, P., Saint-André, L., & Jourdan, C. 2011. Is the simple auger coring method reliable for below-ground standing biomass estimation in Eucalyptus forest plantations? Annals of botany 108, 221–230
I found this for the method:
'Spiral trenches can be simplified by radial trenches taken under crown at 1, 2 and 3 m from trunk if soil horizon is homogeneous. Then you can evaluate root density by separating excavated roots from soil and obtaining root ditribution profile with depth and radial distance. Steps are graded every 20cm'.
I hope this helps :)
Hello Andrew,
Can you share some papers on this regard?
Good day!
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