Empirical Substantiation of the (Double Rising)/(Double Effective) Method of Diameter Growth Estimation
Periodic diameter growth can be obtained by remeasurement of forest stands without the identification (numbering) of individual trees by the Double Rising over Double Effective technique usually associated with the European "methode du contrôle." In application, a complete tally of trees by diameter classes is needed on permanent plots or sample compartments even though the numbering of individual trees is not necessary. In this paper an empirical evaluation of the DR/DE technique is made using data from two continuous forest inventory (CFI) analyses, where typically, individual trees are numbered and growth is determined by subtraction of successive measurements made on each tree. The estimated average annual diameter growth obtained by the DR/DE method compared favorably with the actual average diameter growth as determined in the CFI analysis. Close agreement of the estimated and actual averages was observed in all diameter classes where the sample was reasonably large.
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Document Type: Journal Article
Affiliations: Assistant Professor, Department of Forestry and Conservation, Purdue University, Lafayette, Ind.
Publication date: 1963-04-01
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