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Originally Posted by CandyApple  RodFarlee, looking at your precipitation map combined with the info on the "dry line", it seems that the areas of "green" or higher levels of rain have the forests. I'm wondering, does that also work for this precipitation map of the United States? Is it basically, "green" and above have trees, but areas less than that don't, or are there places on the map where precipitation levels don't necessarily correlate with tree quantity? |
Here's a
U.S. forest density map and an interactive
forest type map, in which you can scroll over the table of tree species to see where they are in the U.S.
Precip doesn't correlate all that well with percent forest cover. For example, the midwest prairies get more rainfall than the pine, pinyon and juniper forests of the west and southwest.