I'm looking for good examples for the creation of artificial nesting sites for ground-nesting bees, in nature reserves, gardens, agricultural strips or green roofs. Which soil type was used, what was the thickness, how about inclination, ...
You might find this of interest:
http://www.urbanbees.eu/en/content/actions
Also, Jim Cane's (1991) study on soil types from native bee nests might be of use.
You might find something in the following work on the nesting biology of a groung-nesting oil-collecting bee.
Martins, C.F., Peixoto, M.P. & Aguiar, C.M.L. Apidologie (2014) 45: 156. https://doi.org/10.1007/s13592-013-0235-4
There is a german article but I don't find on the web
Thank you Gregoire! In the meantime, I found this article on Researchgate: Article Künstliche Nistgelegenheiten für erdnistende Bienen und Wesp...
Another technique:
Article A new technique in the excavation of ground-nest bee burrows...
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