This dataset is associated with the article authored by Marine Pacé, Benjamin Gadet, Julien Beguin, Yves Bergeron et David Paré entitled " Drivers of boreal tree growth and stand opening in boreal forest: the case of jack pine on sandy soils ". It comprises 37 plots including 20 plots near the locality of La Sarre (48° 48’ N; 79° 12’ W) and 17 plots near the locality of Chibougamau (49° 53’ N; 74° 20’ W). It includes data on forest stands (DBH, height, age), permanent environmental conditions (surface deposits, slope, granulometry and chemical characteristics of the C horizon), and non permanent environmental characteristics (disturbance history, understory vegetation, depth of the organic layer, soil water content chemical characteristics of the eluted and accumulation horizons). It also contains data on tree growth (dendrochronological stem analysis) and isotopic composition of the cellulose (13C).