Current issue: 56(2)

Under compilation: 56(3)

Scopus CiteScore 2021: 2.8
Scopus ranking of open access forestry journals: 8th
PlanS compliant
Silva Fennica 1926-1997
Acta Forestalia Fennica

Articles containing the keyword 'hummock ridge'

Category: Article

article id 7029, category Article
Väinö Auer. (1920). The development of the hummock ridges on the peatlands. Silva Fennica vol. 12 no. 2 article id 7029.
Keywords: peatland; hummock ridge; moor; rimpi
Abstract | View details | Full text in PDF | Author Info

The study about the formation of hummock ridges on the peatlands is based on research conducted between years 1915-1919 in Pyhäjoki area in middle Ostrobothnia area in Western Finland, in Kuusamo and Kuolajärvi in north-east Finland, and in different parts of Finnish and partly also in Norwegian Lapland.   

The hummock ridges and the “rimpis” are evolutionary in close connection with each other. Hence the sliding of peat plays an important role in the formation of hammock ridges. The formation of regularly positioned hummock ridges requires sloping surface of the moor, where the water flow or the movement of the peat goes in one direction. Formation of hummock ridges is determined by climatic factors, particularly by the floods and other weather conditions in spring time. 

Conclusion of the study is that the theories up to now about the formation of hummock ridges have not understood the phenomenon completely. The different morphological factors affect by themselves or together by the formation of regular groupings of the hummock ridges.     

The article contains an abstract (Zusammenfassung) in German.
  • Auer, E-mail: va@mm.unknown (email)
article id 7533, category Article
Antti Tanttu. (1915). Development of the hummocks and hummock ridges on the peatland. Silva Fennica vol. 4 no. 1 article id 7533.
Keywords: hummock ridge; hummock; peat bank; string on “aava” bogs; rimpi moore; flark fen; Eriophorum vaginatum
Abstract | View details | Full text in PDF | Author Info

The hummocky peatlands are fairly common in Finland. Peatlands with hummock ridges are rare in southern Finland but become more common in northern parts of the country.

In the incompletely drained flark fens the development of the hummocks can be studied particularly well because they can be found in different development phases there. The phenomenon is more common in drained peatlands than in the peatland on their natural state.

The development of the hummock ridges is close related to development of the hummocks. The hummock ridges are formed only under certain circumstances.  

Height increment of the hummock ridges is restricted by the same factors that prevent the unrestricted height increment of the hummocks. The hummock ridge may sink due to its own weight in unfrozen swamp, it may be eroded by frost, wind, flowing water or ice.  Dead trees, shading or other detriments may prevent the growth of secondary peat.  

  • Tanttu, E-mail: at@mm.unknown (email)

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