C	carbon content
N	nitrogen content
P	phosphorus content
K	potassium content
Ca	calcium content
Mg	magnesium content
LA	leaf area
LT	leaf thickness
LDMC	leaf dry mass content
SLA	specific leaf area
SRL	specific root length
SRA	specific root surface area
RTD	root tissue density
RD	average root diameter
SRT	specific root tip number
LPCA1	PCA1 of leaf functional traits
LPCA2	PCA2 of leaf functional traits
RPCA1	PCA1 of root functional traits
RPCA2	PCA2 of root functional traits