Reddog, THE PROBLEM in the remaining habitat out there is PLANT SUCCESSION! Pheasants and quail don't nest in trees, they don't brood-rear in trees, they don't frequently eat the product of trees. The only time that trees are remotely "necessary" is during the winter. If they haven't already been nested, laid, hatched, brooded, and fed, there won't be any birds to use any trees! TREES are part of the problem!!!!!!!! Most places where pheasants and quail are waning, trees are taking over!
What is lacking there is ideal nesting and brood-rearing cover that was there when 90% of the population lived on the farm. For pheasants that can be cool-season grasses, warm-season grasses, and any number of annual or perennial plants like legumes. For quail that is most often native warm-season grasses (NWSG) and forbs. The reason this problem originated in the east and has moved west is the rainfall belts. Plant succession is much faster where there is the greatest rainfall. It is exacerbated by human habitation, which ultimately limits the use of fire and chops up cover with dwellings, shopping malls, and roads-to name a few! The thing about trees is: the more you have, the more you're going to get! It's a seed-source thing!!! For a landowner to turn back the clock on his 20 -50 years of ignoring the sneaky encroachment, it may cost him as much to eliminate the trees as he paid for the land itself!
If you want our open-land gamebirds, you had best be a proponent of the axe, cow, match and plow (Leopold)! It is important that we, as hunters and conservationists, understand the ecological niche that our gamebirds thrive in and be willing to promote management that heads habitat in that direction. Habitat is always moving ahead and even for our woodland gamebirds, that can be a bad thing. Ask the woodcock and grouse guys that know their bird's adaptive niche. Canopied mature timber ain't it!!! The cutovers that were so popular 50-100 years ago have fallen silent due to plant succession. New clearcuts aren't being done because too many Americans are fond of trees and not the animals that depend upon habitats that those cutovers provided.
If our sport is to survive, we ALL need to understand what plant succession is and where our gamebirds fit into it! We need to ALL be pushing the same direction with the powers that be to get back there! To some, these shifts in plant succession are almost imperceptible. That's part of the problem. You come to Kansas and hunt CRP in 2014 and you wonder why it doesn't have the birds it had in 1986? It's plant succession. It wasn't the grass alone that was what the birds needed. It was the combination of the young grasses and the annual weeds during those first 3-7 years of development that were the "BEST" of the best! Now we have almost pure stands of prairie grasses that haven't been under the normal pressures of grazing and fire and they have evolved beyond the point of being productive bird cover.
My challenge to you is to study your favorite gamebirds habitat needs and understand what you are actually seeing on your DNR wildlife areas and why they aren't the same. In Kansas each wildlife area manager manages an average of 7000 acres. These acres are multi-species use and their time is also divided among 100 other things. They are law enforcement, they run statewide surveys, they have camping areas to manage, roads to grade, fences to maintain, buildings to maintain, boat ramps, cabins, offices, equipment, and hunters and fishermen walking in the door. They teach hunter's ed classes, give fishing clinics, conduct youth hunts, and give talks on anything and everything. They surely don't have enough time, money, or help to keep the PLANT SUCCESSION from getting away. Ask one what his budget and staff are! Do you really think that they can effectively manage a piece of ground on $5-$30 per acre? If a group of 15-30 regular users showed up at his door and took some annual leave and said: we're here to cut trees and help burn, what could he get done then?? Open for redirect!