Even-Aged Management

 Even-aged stand: a stand of trees composed of a single class in which the range of tree ages is usually +/- 20 percent of rotation

Sources:

http://nrs.fs.fed.us/fmg/nfmg/img/silv/standtypes.jpg

www.nrs.fs.fed.us/fmg/nfmg/glos.html#even