The two datasets (oak.tab and beech.tab) were obtained from an experimental plantation established in the spring of 1981 in the Lyons-la-Forêt National Forest in northwestern France (49°28’19”N, 1°33’52”E) and followed until 2017.
These datasets obtained from regular inventories of tree girths of live trees allowed studying the size-density trajectories (1) of pure even-aged unthinned experimental sessile oak and beech stands, from an early development stage.
The oak stand data (oak.tab) cover a range of initial densities from 994 to 135555 trees per hectare and a range of ages from 6 to 38.
The beech stand data (beech.tab) cover a range of initial densities from 472 to 38000 trees per hectare and a range of ages from 12 to 39.
The following data appear in each dataset:
plot (plot number);
origin (planted or sowed);
block (randomized complete block design);
replication (partially replicated treatments within blocks);
planting density or sowing density (theoretical initial density: trees ha-1);
treatment («density treatments»: plots with comparable actual initial densities were grouped together);
actual initial density (number of live seedlings per hectare after transplant shock: trees ha-1);
thinning-modality (some of the planted plots were thinned one time);
thinning-period (before-thinning: part of stand density trajectory used in the modelisation process);
plot area (hectare);
year (time of survey);
age (tree age);
Cg (quadratic mean girth in cm);
N (number of live trees per hectare).
For more explanation about these data, one may refer to the section “Materials and Methods” of the following papers:
Ningre, F., Ottorini, J.-M., Le Goff, N. (2016a) Modelling size-density trajectories for even-aged beech (Fagus sylvatica L.) stands in France. Ann For Sci 73:765-776.
Ningre, F., Ottorini, J.-M., Le Goff, N. Size-density trajectories for even-aged sessile oak (Quercus petraea (Matt.) Liebl.) and common beech (Fagus sylvatica L.) stands revealing similarities and differences in the mortality process. under review
(1) Quadratic mean girth (Cg) in relation with the number of live trees per hectare (N) in log-log scale.
