Bird Response to Clearings 85 



Table 1. Habitat variables used in correlation analyses, bird habitat preference 

 on clearcut, herbicide-treated and uncut plots, January to June 1980 

 and 1981, Knott County, Kentucky. 



Description 



Number of trees>10 cm dbh, within 2 m of a station. 



Diameter of nearest tree (cm). 



Distance to nearest tree (m). 



Basal area of living stems (m^/ha), wedge prism. 



Number of snags> 10 cm dbh, > 1 .8 m tall, within 2 m of a station. 



Diameter of nearest snag (cm). 



Distance to the nearest snag (m). 



Number of stumps>10 cm in diameter and<1.8 m tall, within 2 m of a station. 



Distance to the nearest stump (m). 



Number of logs>10 cm diameter,>1.8 m long, within 2 m of a station. 



Maximum diameter of the nearest log (cm). 



Length of the nearest log (m). 



Distance to the nearest log (m). 



Percent of ground covered by logs within 2 m of a station. 



Distance of the nearest rock>5 cm above ground. 



Percent of ground covered by rocks within 2 m of a station. 



Percent crown cover above 6.1 m at a station. 



Percent vegetation cover between 1.8 and 6.1 m at a station. 



Percent of the ground covered by fallen leaves within 2 m of a station. 



Percent understory cover<1.8 m tall per 4-m^ in Jan. and in Apr. 



Number of understory stems per 4-m^ in Jan. and in Apr. 



Number of understory taxa per 4-m^ in Jan. and in Apr. 



Understory species diversity per 4-m^ in Jan. and in Apr. 



Distance to water (m). 



Slope (%). 



Foliage height diversity. 



January and April of 1980. A modified Aldous method, similar to that 

 described by Murphy and Noble (1972), was used to quantify vegeta- 

 tion. Percent cover and stem density were determined for each plant 

 taxon (at least to genus) on each 4-m^ plot. Total cover, total stem 

 density, plant species richness, and a Shannon-Weaver plant species 

 diversity index were calculated for each station for both sampling peri- 

 ods. April understory values were used in conjunction with May mid- 

 story and overstory values to calculate a foliage height diversity index 

 based on estimated cover of the three layers. Mean habitat characteris- 

 tics were calculated for each 0.4-ha plot and used to characterize the 

 plot. A more detailed discussion of habitat characteristics was given by 

 McComb and Rumsey (in press). 



