The permanent sample plot is a circular sample unit that covers an area of 400 m2. For each tree, the species, diameter, defoliation of softwoods and the quality of hardwoods are observed and measured. Some of these stems are the subject of further studies in order to know their height and age. Finally, other surveys make it possible to identify the ecological characteristics of the station where the plot is located, whether at ground level or undergrowth plants. Since 1970, more than 12,000 permanent sample plots have been established and are monitored decennial. This data is an invaluable source of information on the growth and evolution of forests in Quebec, a source that is enriched each time additional measures are added. In particular, they are used to establish forest growth rates, describe past changes, and model forest evolution. This database covers almost all of the territory south of the 52nd parallel of Quebec's public and private forest. __Note:__ Notice to people who want to use the permanent sample plots for training needs or for sampling of any kind. Please contact the Forest Inventory Directorate at Inventaires.Forestiers@mrnf.gouv.qc.ca**This third party metadata element was translated using an automated translation tool (Amazon Translate).**

From 1986 to 2000, a major ecological inventory program was carried out in the forests of southern Quebec in order to describe the diversity of forest ecosystems. In total, 28,425 ecological observation points (POE) were established on a territory covering 760,000 km2, located between 45° and 53° N latitude and 57° and 80° W longitude. The POE is a circular sampling unit that covers an area of 400 m². It collects data on the characteristics of forest stand (composition, structure), soil (texture, deposit, drainage), and topography, as well as location information. The coverage of each plant species in the plot is estimated visually. A detailed description of a soil profile is available in approximately 35% of POEs. The ecological classification elements of POEs (groups of indicator species, forest types, potential vegetation, ecological types, etc.) are determined using computerized identification keys using data on vegetation and the physical environment. The criteria used for this ecological classification are those presented in the guides for the recognition of ecological types. The levels of the ecological classification system of the territory are also determined for each POE.**This third party metadata element was translated using an automated translation tool (Amazon Translate).**