Earthworm Diversity and Soil Nitrogen Levels

Number of earthworm species and total nitrogen content in the soil in 39 hardwood forest plots.

Usage

Earthworms

Format

A data frame with 39 observations on the following 2 variables.

worm.species

a numeric vector

nitrogen

a numeric vector

Source

Gundale, M.J., W.M. Jolly, and T.H. Deluca. 2005. Susceptibility of a northern hardwood forest to exotic earthworm invasion. Conservation Biology 19: 1075-1083.

References

http://www3.interscience.wiley.com/journal/118701215/abstract

Examples

str(Earthworms)
#> 'data.frame':	39 obs. of  2 variables:
#>  $ worm.species: int  0 0 0 0 0 1 1 1 1 1 ...
#>  $ nitrogen    : num  0.22 0.19 0.16 0.08 0.05 0.33 0.3 0.26 0.24 0.2 ...
xyplot(nitrogen ~ worm.species, Earthworms)