First-level Permanent Observation Plots (POPs I)
Annual observations and measurements
Observations of morphological features of sample trees crowns :
defoliation
discolouration
number of year classes of needles
leaf or needle size
proportions of shoot growth
intensity of seeding
intensity of flowering
type of tree crown transparency
share of dead branches
Dendrometric measurements :
diameter at breast height measurement (of trees with dbh over 7 cm) on circular plots
Population densities of leaf-eating insects in coniferous stands :
nun moth
pine sawflies
pine noctuid
pine looper
pine sphinks moth
pine lappet moth
pine webworm
pine shoot beetles
The level of threat to forests posed by pathogenic fungi
assessment of symptoms of dieback of pine shoots
assessment of stump colonization by fungi
Second-level Permanent Observation Plots (POPs II)
Continuous measurements
concentrations of SO2 i NO2 using a passive method
chemical composition of precipitation waters
Annual observations and measurements
assessment of pine seed quality
Periodic observations and measurements
chemical analyses of needle and leaf samples (every 4 years)
assessment of diversity of forest-floor species (every 5 years)
evaluation of intensity and vitality of natural regeneration (every 5 years)
measurement of stand volume and annual volume increment (every 5 years)
soil researches :
chemical characteristics (every 4 years)
soil typology, grain composition, physical characteristics (varied)