Stand level modelling

Stand level modelling is a type of modelling in the forest sciences in which the main unit is a forested stand.

A forest stand is a contiguous community of trees sufficiently uniform in composition, structure, age and size class distribution, spatial arrangement, site quality, condition, or location to distinguish it from adjacent communities.

A forest is a "collection of stands".

A forest stand is commonly described as in 10ths or 10%s. Thus a ratio could be given of: 3 Ponderosa pines, 2 mangrove trees, 5 silver spruces. If there was a mixed stand that stand mix could be described as mixed up to 10%, mixed 10-40% and a mixed stand over that amount.

The form of mixing of the tree types is commonly given as:

A stand's spacing may be described by the crown cover of the trees. It can thus be delimited as:

Stands are not logical, ecologically defined management units. Instead they have evolved from the Normalwald concept, which was predicated on the idea of harvesting efficiency and thus that forest land was primarily to generate income from timber production. Stands allow easier forest inventory and planning. The concept has by way of extension been applied across all forestry practice in the world, but originated in the Mitteleuropa of the late 18th and early 19th century with the mercantilist tradition, Prussian education and emergence of modern silviculture.

Along with the Normalwald concept has come the idea that stands are standardized in terms of size, species mix, age class and other tree metrics and that forestry should aim to impose this on nature where it has not existed up till now.

As stand is from an economic timber forestry perspective. It is very focused on the tree element of forests. It is not considerate of the other elements within a forest such as shrubs, animals or topography and alternative terms may better fit ecological or other land value purposes within forests. The English term grove is one example. Also proposed is eco-unit. Other terms may also work, but be on different scales, such as copse or woodland. To be useful in silviculture such terms must be clearly defined and consistently applied. Lacking that stand is likely to remain the preferred unit to be used by foresters and others managing forests, despite its limitations.

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