treecanopy: Tree canopy gradients in the Priest River Experimental Forest...
In lgrdata: Example Datasets for a Learning Guide to R

Description Usage Format Source Examples

Leaves of two pine species (35 trees in total) were sampled throughout their canopy, usually 8 samples were taken at various heights. The height is expressed as the 'distance from top', i.e. the distance to the apex of the tree. Leaves (conifer needles) were analysed for nitrogen content (narea), and an index of leaf thickness, the 'leaf mass per area'. The data show the usual pattern of higher leaf thickness (higher LMA) toward the top of the trees, but individual trees show a lot of variation in LMA.

1	treecanopy

A data frame with 249 rows and 7 variables:

ID: integer ID of the individual tree
species: integer Pinus ponderosa or Pinus monticola
dfromtop: double Distance from top of tree (where leaf sample was taken) (m)
totheight: double Total height of the tree (m)
height: double Height from the ground (where sample was taken) (m)
LMA: double Leaf mass per area (g m$^-2$)
narea: double Nitrogen per area (gN m$^-2$)

Marshall, J.D., Monserud, R.A. 2003. Foliage height influences specific leaf area of three conifer species. Can J For Res 33:164-170

data(treecanopy)
if(require(ggplot2)){
 ggplot(treecanopy, aes(dfromtop,LMA,group=ID,col=species)) +
   geom_point() +
   stat_smooth(method="lm",se=FALSE) +
   theme_minimal()
}