Two other stand-data traditions — the German and Austrian target-diameter harvest (Zielstärke) and the Swiss control method (cut the increment) — on the same plots and tree records.
For
Consultant foresters
Time
4 minutes to read
Where
Web — Methods & targets; field app — Stand data
Updated
On this page
Both use the same plots and tree tally as BDq; only the objective and the reading differ. Target diameter is recommended in Germany (Bavaria included) and Austria, the control method in Switzerland provisional; BDq stays available beside them. Elsewhere either can still be chosen, with a caution that it was designed for another region.
Target diameter (Zielstärke)
Trees are harvested one by one when they reach the target diameter for their species. The result is the harvestable pool — stems at or above each species’ target — and progress toward it. Set the target diameters per species in the objective (defaults are provided; set yours).
Field app (Android)Target diameter › Tree.
Eligible is not chosen
A tree at target diameter is eligible; whether its value is still increasing enough to keep it is your call — the app flags it and never decides.
Control method (méthode du contrôle)
Growing stock is measured repeatedly on the same plots; the measured periodic increment says how much may be cut — cut the increment. Set the stand’s normal growing stock (basal area, default 26 m²/ha) in the objective; results show growing stock over time, increment and cut against increment.
No value-increment model for target-diameter decisions.
No demo stand uses these methods, so their result pages are not shown here.
Sources: Zielstärkennutzung practice (Germany, Austria): Waldbaurichtlinie für die Berliner Forsten (2011) §3.2.5; Reininger (1987) Zielstärken-Nutzung oder die Plenterung des Altersklassenwaldes; Sterba & Zingg (2001) Forest Ecology and Management 151. Gurnaud / Biolley, méthode du contrôle: Biolley (1920) L’aménagement des forêts par la méthode expérimentale et spécialement la méthode du contrôle; Favre & Oberson (2002) 111 années d’application de la méthode du contrôle à la forêt de Couvet.