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A northern hardwood forest should be kept thinned to 60-70 basal square feet per acre for trees over 9.5" in diameter. If you don't want to calculate the basal area, look at the canopy. A correctly thinned woodlot should have at least a few feet between the crowns of the trees on at least two sides.

Dan O.

If you thin some its sure to benifit the other if they are fighting for sunlight ,but it can also work the other way too . My neighbor cut down all of his oak trees so the fir trees could do better .Well all the extra sunlight dried out the ground and all the fir trees died then. Now the land is mostly brush and not good for anything without a lot of work . The only good thing is it has a lot of deer and turkeys on it .