Late to this thread but it just caught my eye. Every winter I do a few poplar regeneration cuts on the 150 acres I hunt and manage to create grouse habitat. I only have very mature 70 or 80 year old trees scattered randomly throughout the land, and no young stands at all. Generally what's good for grouse is also good for deer, so it's just a great project. What you do is remove, drop, or girdle all trees in a 20 yard radius of a mature poplar. You clear a bit more to the south of the tree so that it kind of looks pear shaped when you're done. One you have cleared the small plot of all trees you then drop the poplar. I always leave exactly one drumming log for grouse, and usually it's that last poplar if it's the right DBH...about 10"
Not sure exactly what your objective is, but these can be real successful at creating SUPER thick aspen stands fairly quickly, as poplars regenerate as clones through their roots. If successful you'll get poplar clones popping up year one and will in just a few short years have some great deer and grouse cover. Best time to do it is before green up. Leave a few snags for woodpeckers. And by doing a few a year I have always various stages of aspen somewhere on the land.