A technique for sampling low shrub vegetation, by crown volume classes

Jay R. Bentley; Donald W. Seegrist; David A. Blakeman

Treesearch

A technique for sampling low shrub vegetation, by crown volume classes

Informally Refereed

Authors:

Jay R. Bentley, Donald W. Seegrist, David A. Blakeman

Year:

1970

Type:

Research Note

Station:

Pacific Southwest Research Station

Source:

Res. Note PSW-RN-215. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 12 p

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Download (PDF 1.65 MB): https://research.fs.usda.gov/download/treesearch/30790.pdf

Abstract

The effects of herbicides or other cultural treatments of low shrubs can be sampled by a new technique using crown volume as the key variable. Low shrubs were grouped in 12 crown volume classes with index values based on height times surface area of crown. The number of plants, by species, in each class is counted on quadrats. Many quadrats are needed for highly precise measurements. Shrub dry-weight was highly correlated with crown volume for each of the four species studied, but ratios of weight to volume were variable.

Keywords

herbicide effects, sampling techniques, crown volume measurement, shrub cover

Citation

Bentley, Jay R.; Seegrist, Donald W.; Blakeman, David A. 1970. A technique for sampling low shrub vegetation, by crown volume classes. Res. Note PSW-RN-215. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 12 p