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A Test of a Single Disk for Estimation of Hardwood Bole and Branch Nutrient Concentrations

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Six major bottomland hardwood species of a range of diameter classes from five even-aged, mixed stands, were sampled for N, P, K, Ca, and Mg determinations. Evaluation of a single disk bole and branch nutrient concentration sampling scheme was performed. Comparisons between weighted bole and branch mean concentrations and disk subsample concentrations were made through a chi-square test and confidence interval estimation. A single bole disk did not provide nutrient concentrations within ±10 percent of the individual tree nutrient levels, unless a 1-in-20 chance occurred. However, the mean wood N, P, and K concentrations of a sample of ½-height bole disks were within ±10 percent of the mean of bole concentrations for that sample. A single branch disk subsample was unable to satisfy accuracy standards for crown nutrient concentration estimates. The results indicate the necessity of sampling at least several trees per stand and intensive sampling of the tree crown for nutrient evaluations. Forest Sci. 29: 618-626.

Keywords: Estimation accuracy; biomass; whole-tree utilization

Document Type: Journal Article

Affiliations: Research Scientist, U.S. Forest Service, Southeastern Forest Experiment Station, Athens, Ga.

Publication date: September 1, 1983

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
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