http://hdl.handle.net/10150/223890 Thu, 12 Mar 2026 12:54:16 GMT 2026-03-12T12:54:16Z http://hdl.handle.net/10150/262984 Tree-Ring Bulletin, Volume 35 (1975) Complete issue of Tree-Ring Bulletin. Wed, 01 Jan 1975 00:00:00 GMT http://hdl.handle.net/10150/262984 1975-01-01T00:00:00Z http://hdl.handle.net/10150/260157 A Computer Program for Simulating Cambial Activity and Ring Growth Stevens, Donal W. This paper describes an interactive computer program which simulates daily cell growth and differentiation in a single radial file of tree cells. The growth processes are controlled by 22 model parameters, half of which are constants, the remainder time-dependent. The program user specifies the constants and the form of the time variations desired. The program computes daily values for the time-dependent parameters, and applies these values to the calculation of cell diameters, cell division, cell wall thickness, and ring width for each day of the growing season. Output is in tabular and graphical form. The tabular listing consists of the cell diameter at each position in the radial file, and for the xylem it also prints cell wall thickness and a relative density for each cell. The graphical output plots cell diameter, wall thickness, and relative density vs. file position. The program was designed primarily as an instructional tool and has been used for this purpose with good results. Because of its flexibility it has potential for research, and some possibilities for such use are discussed. Wed, 01 Jan 1975 00:00:00 GMT http://hdl.handle.net/10150/260157 1975-01-01T00:00:00Z http://hdl.handle.net/10150/260132 An Objective Method to Identify Missing or False Rings Wendland, Wayne M. Wed, 01 Jan 1975 00:00:00 GMT http://hdl.handle.net/10150/260132 1975-01-01T00:00:00Z http://hdl.handle.net/10150/260125 Selecting and Characterizing Tree-Ring Chronologies for Dendroclimatic Analysis Fritts, Harold C.; Shatz, David J. A widely spaced grid of tree-ring chronologies most suitable for dendroclimatic analysis of western North America is selected objectively on the basis of 1) numbers in the sample, length in years, and site locations, 2) statistical characteristics of the chronologies, and 3) correlation of chronologies with those on neighboring sites. The chronology statistics are then analyzed to characterize the quality of the selected set. The procedures used in this study are recommended for future climatic analysis to assure objectivity in the selection of quality tree-ring data and to allow comparisons of the statistics for new chronologies to the established data sets. Wed, 01 Jan 1975 00:00:00 GMT http://hdl.handle.net/10150/260125 1975-01-01T00:00:00Z