Curves of height over age were drawn for each of 59 even-aged aspen plots in the southern Rocky Mountains. Because plot curves varied considerably for stands with similar heights at the index age (80 years), the accuracy attainable in site index estimates is limited. Natural site index curves were developed by a simple graphical method and site index was estimated for each plot from heights read on the plot curves at ages 20, 30, 50, 100, and 130. Gross inaccuracies were common at age 20, and 30-year-old stands were not reliable site indicators. Stands 50 years old or older estimated site index closely.
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Document Type: Journal Article
Associate Forest Ecologist, Rocky Mountain Forest and Range Expt. Sta., Forest Service, U.S. Dept. Agric., with central headquarters at Fort Collins, in cooperation with Colo. State Univ.
Publication date: 01 November 1967