Table 1.

Summary and description of all traits and variables that were used as predictors for phytometer performance

Abbreviation	Unit	Description	Predictor type
LAR	cm²/g	Leaf area per unit total dry mass	PT, CWM, FD
LCaC	μmol/g	Leaf calcium concentration	CWM, FD
LCC	%	Leaf carbon concentration	CWM, FD
LCNR	g/g	Leaf carbon‐to‐nitrogen ratio	CWM, FD
LDMC	mg/g	Leaf dry mass per leaf fresh mass	PT, CWM, FD
LKC	μmol/g	Leaf potassium concentration	CWM, FD
LMgC	μmol/g	Leaf magnesium concentration	CWM, FD
LNC	%	Leaf nitrogen concentration	CWM, FD
LPC	μmol/g	Leaf phosphorus concentration	CWM, FD
RCaC	μmol/g	Root calcium concentration	PT, CWM, FD
RCC	%	Root carbon concentration	PT, CWM, FD
RCNR	g/g	Root carbon‐to‐nitrogen ratio	PT, CWM, FD
RDMC	mg/g	Root dry mass per root fresh mass	PT, CWM, FD
RKC	μmol/g	Root potassium concentration	PT, CWM, FD
RMgC	μmol/g	Root magnesium concentration	PT, CWM, FD
RMV	g/cm³	Root mass per unit root volume	PT, CWM, FD
RNC	%	Root nitrogen concentration	PT, CWM, FD
RPC	μmol/g	Root phosphorus concentration	PT, CWM, FD
RSR	g/g	Dry mass of roots per unit dry mass of aboveground organs	PT, CWM, FD
RVol	cm³	Root volume	PT, CWM, FD
SDMC	mg/g	Shoot dry mass per shoot fresh mass
SLA	m²/kg	Leaf area per unit leaf dry mass	PT, CWM, FD
LUI		Land‐use intensity Index	Env
PAP	mg/kg	Total plant‐available phosphorus concentration	Env
pH		pH of soil	Env
Total C	g/kg	Total soil carbon concentration	Env
Total N	g/kg	Total soil nitrogen concentration	Env
Total P	g/kg	Total soil phosphorus concentration	Env
rH 200	%	Relative humidity 200 cm aboveground	Env
SM 10	% VWC	Soil moisture at 10 cm depth	Env
Ta 10	°C	Air temperature 10 cm aboveground	Env
Ta 200	°C	Air temperature 200 cm aboveground	Env

The last column shows for which of the four predictor types the trait was used. Total number of used predictors n = 78. CWM, community‐weighted mean; Env, environment; FD, functional diversity; PT, phytometer traits. RVol was not included to predict root biomass.