Genetic Consequences of Tropical Second-Growth Forest Regeneration

The history of the forests in canton Geneva, having led to these being disconnected from productive functions, provides a symptomatic demonstration that the services provided by the forest eco-system are common goods. Having no hope of financial returns in the near future and faced with increasing social demands, the state has invested in the purchase of forest land, financed projects for forest regeneration and improvement of biological diversity and developed infrastructures for visitors. In doing this the state as a public body takes on the provision of services in the public interest. But the further funding for this and for expenses for the private forests, which must be taken into account, are not secured for the future.

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Stufige Mischwälder im Unter-Thurgau | Stratified Mixed Forests in the Lower Thurgau

Schweizerische Zeitschrift fur Forstwesen ◽

10.3188/szf.1999.0249 ◽

1999 ◽

Vol 150 (7) ◽

pp. 249-251

Author(s):

Heinz Kuhn

Keyword(s):

20Th Century ◽

Forest Regeneration ◽

Central Plateau ◽

Intervention Intensity ◽

Continuous Forest ◽

Federal Institute ◽

As Species ◽

Landscape Research ◽

Selection Forest ◽

Structure Diversity

As in many parts of the Swiss Central Plateau, vast coppices with standards have grown in the region of Diessenhofen for centuries. While in other parts of the first decades of the 20th century the forests were converted to areas of forest regeneration species, the foresters of the Diessenhofen region altered numerous pillaged coppices with standards to a stratified continuous forest. The advantages of this form of management such as species and structure diversity and lower costs in comparison with the forest stratified by age are being presented. Each of the four foresters in the region has formed different stand images through his personal intervention intensity. There are different ways possible for achieving a continuous forest, in order to prove this, differences of managing a selection forest system are carried out by the four regional foresters. After decades of experience in tending stands established out of former coppices with standards, the approach of converting plenter forests from existing forests stratified by age to stratified continuous forests is experienced. The successes also encouraged the foresters of the neighbouring district Steckborn to do the same. This creative task is being accompanied scientifically by the WSL (Federal Institute of Forest, Snow and Landscape Research, Birmensdorf, Switzerland), which has established permanent observation areas. The steps in the previously intuitive procedure can, therefore, now be traced.

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The early stages of spontaneous forest regeneration on poor soils and continental sand dunes in northern Belgium

Silva Gandavensis ◽

10.21825/sg.v49i0.968 ◽

1983 ◽

Vol 49 ◽

Author(s):

M. Van Miegroet

Keyword(s):

Scots Pine ◽

Age Differences ◽

Forest Regeneration ◽

Sand Dunes ◽

Mixed Forest ◽

Pedunculate Oak ◽

White Poplar ◽

Technical Problems ◽

Homogeneous Groups ◽

Invading Species

Spontaneous natural regeneration under variable conditions on sandy soils and continental sand dunes were analysed in 5 locations in N.E. Belgium. The number of seedlings varies between 14.000 and 522.000/ha. The most prominent invading species are red oak, pedunculate oak and Scots pine. Two principal types of regeneration are recognized : homogeneous groups of oak or pine and mixtures, predominantly composed by the same species. Pioneers such as birch, willow, white poplar and wild black cherry do not play an important role. Social differentiation sets in quite early and is mainly provoked by age differences. Therefore early silvicultural intervention is advisable. The growth relationships between the species indicate that Scots pine is not in danger of spontaneous elemination by other species. Because of the density and variability of spontaneous forest regeneration, the conversion of pure pine stands into mixed forest, using group regeneration to this end, poses no real technical problems.

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