Hi all, I was driving along the highway the other day and noticed that some tall pine trees have lower branches and others don't. I would suggest the reason for this is that in some groves of trees the sun manages to reach the lower branches either because the grove has a plain on one of its edges or because the upper branches are sparse enough to allow a sufficient amount of sunlight through to allow the lower branches to photosynthesize.
One other explanation would be that there are foresters who intentionally go through and remove the lower growth from the trees so that the trees don't waste undue energy on maintaining the lower branches which aren't as capable of producing energy. Would another possible explanation be simply a difference in the species of the tree? For instance some trees are just better at maintaining lower branches with minimal exposure to sunlight.
Thanks for any suggestions for why this phenomenon occurs, Novice