I found this, Bill, via OneLook, about pollarding:
http://en.wikipedia.org/wiki/Pollarding
and this, about Coppicing:
http://en2.wikipedia.org/wiki/Coppicing

very interesting stuff!

here's a pic of pollarded trees:
http://www.western-road.info/images/pollard3.jpg
the pictures of coppices were less satisfactory...




formerly known as etaoin...