the planting of lines of trees to stop desertification problems in the plains is pretty widespread. A lot of it was done in America and Russia in the past, now China seems to be doing it, e.g. “Green Wall of China” en.wikipedia.org/wiki/Green_Wall_of_China
Well, can somebody explain to me, how does it work? What is so special about the trees? E.g. suppose we use a bulldozer to make a big dirt wall of the same height as a tree, would that work the same way?
Or, suppose the tree fence has to be wide to work. (BTW, how wide is it supposed to be? How many rows of trees?) Well, so let’s make two or three parallel dirt walls whose combined air-dynamic properties will be similar to the requisite tree fence.
Incidentally, yes, I do know about how the trees’ roots are holding the soil or something like that. But, the tree roots from a tree fence are only taking up so much space - basically the space under the fence. Meanwhile, the declared purpose of the fence (AFAIK, at least) is to deal with the problem of the wind destroying the soil far away from the fence and its roots. In fact, maybe that’s why it is even called “windbreak” http://en.wikipedia.org/wiki/Windbreak
Ok, so what’s wrong with my reasoning? Why do they plan tree fences that will grow up maybe in 10 years if they could just go run a bulldozer and build an equivalent wall right now?