The dataset is an aggregation of data from different studies aimed at developing near-infrared reflectance spectroscopy (NIRS) calibrations of plant parts to analyze leaf nutrients and defense compounds content. This study was designed to investigate whether the chemical composition of plants was varying with warmer temperatures and different grazing intensity from reindeer throughout the summer season. Plants were collected in several areas of Troms and Finnmark (Norway) over a large spatial scale: 140 kilometers North to South and 285 kilometers West to East. We selected 10 sites in summer pastures and 5 migratory pastures, spanning A 2,5°C gradient in mean July temperatures. Plant data were collected during two consecutive summers (2011-2012) both in early July and late August to capture seasonal variation in chemical composition. Plants were also sampled in grassland vegetation and dwarf shrub heath vegetation to check for variation in the chemical composition of plants between the 2 vegetation types.

R, 4.3.1