Christian Körner and Günter Hoch published an article in the Journal of Biogeography that synthesizes the current concept of treeline theory. The authors promote the strict application of a dual niche concept to explain the treeline phenomenon on a global scale, which is especially crucial to correctly identify climate warming effects on alpine and arctic treeline.

Reference:

Körner C, Hoch G (2023) Not every high-latitude or high-elevation forest edge is a treeline. Journal of Biogeography. doi: 10.1111/jbi.14593

https://onlinelibrary.wiley.com/doi/full/10.1111/jbi.14593