In Tamid 2:3, the Mishna tells us that the kohanim would bring גִזְרִין - logs - every morning to serve as the fuel for the fire on the Altar. It goes on to report that most types of wood are eligible, but that
בְּאֵלּוּ רְגִילִין, בְּמֻרְבִּיּוֹת שֶׁל תְּאֵנָה וְשֶׁל אֱגוֹז וְשֶׁל עֵץ שָׁמֶן
It was [the wood] of these [trees] they commonly used, branches of a fig tree, walnut [tree] or an oil [tree].
What does the word מֻרְבִּיּוֹת, "branches" at least according to R' Ovadia Mibartenura, tell us here? Was the common practice to use branches specifically, as opposed to trunks of these trees? If so, why? Was it that the branches tended to more closely match the necessary dimensions of the logs that were required? Was it because branches were more of a renewable resource, not requiring the destruction of a whole tree to harvest?