Spatial and Temporal Heterogeneity Creates a “Brown Tide” in Root Phenology and Nutrition

Table 2

Hypothesized factors, variable names, and abbreviations of variables used in candidate models.

Hypothesized factor	Variable names (predictor variables)	Abbreviation
Temporal	Julian day	JDAY
	Julian day squared (quadratic)	JDAY2
	Year	YEAR
Soils	Terrain wetness (compound topographic index)	CTI
	Bedrock formation	GEO
Temperature	Growing degree day (5^°C)	GGD
Slope/aspect and sunlight	Global solar radiation (on Julian day 172)	GLBL172
	Crown cover	CROWN
Landcover	Landcover category	LANCOV