Carbon stress anticipates the budbreak timing in shade-tolerant species and delays it in shade-intolerant species

File Budbreak DRYAD: Budbreak dynamics in saplings of temperate tree species expressed as the cumulative number of plants showing broken buds and as the cumulative number of plants showing broken buds relative to the final number of plants showing broken buds. Budbreak was recorded weekly in an outdoor experiment using saplings of five species of the temperate forest of southern Chile and the exotic temperate species <em>Acer pseudoplatanus. Saplings were expsoed </em>to two experimental light conditions (open and shade conditions); budbreak was evaluated after one year under the light conditions. <br> <br> The open light condition was represented by full light availability, whereas the severe shade condition was achieved by placing the pots on the ground beneath a sparse shade of <em>Alnus glutinosa</em> (Betulaceae) trees, and by completely covering the lateral sides and the top with frames of a black raschel mesh 80% of shade. Each block contained 6 individual saplings per species and light condition. The photosynthetic photon flux density (PPFD, mean ± SE, n = 4 blocks) was 888 ± 169 and 85 ± 199 μmol·m −2·s −1 for the full light and severe shade conditions, respectively. Saplings were regularly watered during the growing seasons. By August 2014 (late winter), i.e., eleven months after the light treatment application, we started to record sapling’s budbreak. Budbreak was defined as the bud stage when at least one small new leaflet was visible. This budbreak monitoring was completed by late November 2014 when all individuals showed leaves. <br> <br> File NSC DRYAD: <br> Mean whole-sapling concentrations of non-structural carbohydrates (NSC), total soluble sugars (TSS), starch, and the TSS/NSC ratio, of saplings of five species of the temperate forest of southern Chile and the exotic temperate species <em>Acer pseudoplatanus</em> under two experimental light conditions. In late April 2015, two living saplings per light treatment and block were harvested for biomass and non-structural carbohydrates (NSC) determination. Each sapling was separated into roots, stems (including branches and twigs), and leaves. Tissue samples were dried and then ground into a fine powder and analyzed for biomass and carbohydrates concentrations.