Thanks for your interest for my XyloDensMap project. We have finished the sampling of one hundred thousand of increment cores, the wood density measurement are finished as well and o awe are now in the process of cross validation of this huge new data base covering all the Frech forests, about one hundred and sixty forest tree species
Therefore there is a lot of work to do including several research topics for PhD thesis. However to answer your question, I cannot offer a PhD grant, nor accept a PhD candidate that has not a salary.
Sorry for this negative outcome
Nevertheless, feel free to ask any question on this project