Ertragsniveau und maximale Bestockungsdichte : Als Grundlage für die Modellierung der natürlichen Mortalität

Tharandt

Deutscher Verband Forstlicher Forschungsanstalten

2008

S. 123-132

12 Abb., 1 Tab., 15 Lit. Ang.

Artikel aus einer ZeitschriftUnselbständiges Werk

200151441

Jahrestagung 5.-8. Mai 2008, Trippstadt, S. 123-132

Reineke Stand density rule relating stem numbers to mean diameter is generally used as reference for modelling maximal stand density and therefore for determining mortality due to promiscuity. The linearity of this relationship after double logarithmic transformation, as accepted to date, is questioned for untouched stands as well as stand with conventional thinning regime. Curvilinear course is demonstrated for spruce and beech stands by incorporating a quadratic member to the original equation, which adjunction is statistic highly significant. It is interpreted as a change in mortality due to competition in young stages and more to ageing in older ones. A more accurate estimation of the maximal stand density needs to take heed of the important variation around the mean course, known as yield level. An original method for assessing yield level for every stand whether thinned or not is presented, based on estimating the effect stand opening on basal area. Yield level has an influence on stem number distribution, especially on its spreading as well as on diameter increment.