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Publication Information

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Title: Crown characteristics of several coniferous tree species: relations between weight of crown, branchwood and foliage and stem diameter

Author: Storey, Theodore G; Fons, Wallace L.; Sauer, F.M.;

Date: 1955

Source: Interim Technical Report AFSWP - 416, Division of Fire Research, Forest Service, U.S. Department of Agriculture. 95 p

Publication Series: Other

Description: Prediction of wind breakage and uprooting in tree stands requires information on weight of dry crown, branchwood, and foliage. This information has not been published. An experimental program started in 1951 has led to a number of generalized relations by which these crown characteristics can be determined with good accuracy over a wide range of tree diameters, species, and species groups.

Crowns, their components–branchwood and foliage–and stems were analyzed for 211 conifer trees representing 13 species and 4 sites from 4 states. Diameters of stems ranged from 1 inch to 37 inches at breast height. Weights of dry crown, dry branchwood, and dry foliage were found to be significantly related to stem diameter at base of live crown for each species provided crown length is taken into account.

Relation for crown weight varied with species and site but not with crown geometry, position of the crown in the canopy, or age. Both branchwood and foliage relations appearĀ·to behave similarly.

Crown weight relations for all species were grouped by statistical comparison of regression lines. Resulting groups were rationalized on the basis of similar tree characteristics in an attempt to establish a basis for rating the crown weight of foreign species, or native species not yet analyzed. No firm basis for ratings could be deduced. At a 12-inch stem diameter at base of crown, crowns of shade-tolerant species were not necessarily heavier than those of intolerant trees although they generally had smaller branch-to-foliage ratios. In all species this ratio exceeded 1.0 for trees larger than 5 inches stem diameter at base of crown.

So that results could be applied to stands of trees, the species were grouped to correspond to 11 selected American forest cover types. Equations for weight times length of dry crown for these 11 cover types are presented.

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Storey, Theodore G; Fons, Wallace L.; Sauer, F.M. 1955. Crown characteristics of several coniferous tree species: relations between weight of crown, branchwood and foliage and stem diameter. Interim Technical Report AFSWP - 416, Division of Fire Research, Forest Service, U.S. Department of Agriculture. 95 p

 


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