Title: Relation of Stem Diameter, Branch Basal Area, and Leaf Biomass in Rapidly Growing Loblolly Pine
Author: Williams, Thomas M.; Gresham, Charles A.;
Source: Gen. Tech. Rep. SRS–71. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. pp. 216-219
Publication Series: Miscellaneous Publication
Description: Twenty loblolly pines, growing in International Paper’s maximum growth experiment at Bainbridge GA, were destructively sampled at the end of the sixth growing season. Ten trees in the control and 10 in the maximum treatment were sampled. All trees were planted at a 2.4- by 3.6-m spacing and grown with complete competition control. The maximum trees also received irrigation, fertilization, and pest control. Tree measures were basal diameter, d.b.h., height of live crown, diameter at base of live crown, and total height. Each tree was sectioned at 1-m intervals and stem diameter determined at each end. Branches were removed and height, basal diameter, and length were measured on each branch. Branches were separated into foliated and unfoliated segments and weighed green. One branch from each meter was returned to the lab to determine dry weight and foliated branch to foliage ratios. The maximum treatment trees were considerably larger (17.2 cm-d.b.h., 9.57 m tall, 0.118 m3 stem volume to 5-cm top) than the controls (13.5 cm-d.b.h., 7.72 m tall, 0.58 m3 stem volume), but crown lengths were similar (6.7 m maximum, 6.6 m control). In the upper 5 m of crown, leaf biomass was highly corre-lated with branch basal area (r2 = 0.697 to 0.947), and there was a constant ratio of leaf biomass to branch basal area (50.4gm per cm2 for maximum, 50.2 gm per cm2 for control). In general, we found a constant ratio of bole basal area to cumulative branch basal area throughout the crowns (0.94 for controls, 1.06 for maximum).
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Williams, Thomas M.; Gresham, Charles A. 2004. Relation of Stem Diameter, Branch Basal Area, and Leaf Biomass in Rapidly Growing Loblolly Pine. Gen. Tech. Rep. SRS–71. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. pp. 216-219
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