Full text of this article is only available in PDF format.

Matti Keltikangas (email), Jukka Laine, Pasi Puttonen, Kustaa Seppälä

Vuosina 1930-1978 metsäojitetut suot: ojitusalueiden inventoinnin tuloksia

Keltikangas M., Laine J., Puttonen P., Seppälä K. (1986). Vuosina 1930-1978 metsäojitetut suot: ojitusalueiden inventoinnin tuloksia. Acta Forestalia Fennica no. 193 article id 7639. https://doi.org/10.14214/aff.7639

English title: Peatlands drained for forestry during 1930–1978: results from field surveys of drained areas

Abstract

An extensive field-based survey was conducted to establish the distribution of site types on drained peatlands, the condition of the drainage networks, the post-drainage development of the tree stands, their structure and silvicultural condition and the corresponding requirements for operational measures. The data is based on sampling of the forest drainage undertaking during 1930–78 and consists of 1,312 km inventory transect, 6,030 relascope sample plots and 21,700 studied ditches.

Of the studied peatlands more than 60% were Scots pine (Pinus sylvestris L.) mires, slightly under 20% Norway spruce (Picea abies) mires, and under 10% each treeless mires and paludified upland forest sites. The remaining peatland area that is to be considered suitable for forest drainage according to criteria used by Heikurainen (1960) now consists mainly of spruce mires and paludified upland forest types; about 1 million ha both groups still remain undrained.

The proportion of ditches in need of ditch cleaning was estimated to be under 10% in the youngest drained areas and under 30% in the oldest. The mean tree stand volumes of the drained peatlands of different site types show the same dependence on the trophic level as in earlier studies but the volumes seem to be some 5–10% lower. These results compare favourably with those of the 7th national forest inventory.

Trends in the post-drainage development of tree stand volumes and increment are also, generally, in accordance with earlier findings but have somewhat lower values. The development of the nutrient-poor site type stands, especially in Northern Finland, seems to be significantly poorer than was earlier assumed.

The PDF includes a summary in English.

Original keywords
suotyypit; ojitetut suot; inventointi; kuivatusteho; ojaverkosto; metsänhoidollinen tila

English keywords
inventory; forest drainage; drainage effect; site type distribution; silvicultural condition; ditch network

Published in 1986

Views 2519

Available at https://doi.org/10.14214/aff.7639 | Download PDF

Creative Commons License CC BY-SA 4.0

Register
Click this link to register to Silva Fennica.
Log in
If you are a registered user, log in to save your selected articles for later access.
Contents alert
Sign up to receive alerts of new content

Your selected articles
Your search results
Paavilainen E., Seppälä K. (1980) Management of old forest drainage areas – papers.. Silva Fennica vol. 14 no. 2 article id 5077
Keltikangas M., Seppälä K. (1977) The economics of growing downy birch stands on d.. Silva Fennica vol. 11 no. 1 article id 4962
Sarasto J., Seppälä K. (1977) The effect of dwarf-shrub vegetation supression .. Silva Fennica vol. 11 no. 1 article id 4960
Keltikangas M., Seppälä K. (1973) Variations in the profitability of forest fertil.. Silva Fennica vol. 7 no. 3 article id 4886
Seppälä K., (1971) The quantity of fertilizer and application metho.. Silva Fennica vol. 5 no. 2 article id 4838
Seppälä K., (1968) Preliminary results of post-drainage development.. Silva Fennica vol. 2 no. 3 article id 4770
Heikurainen L., Päivänen J. et al. (1966) Scots pine seeding and planting on drained peat .. Silva Fennica vol. no. 119 article id 4731
Heikurainen L., Keltikangas M. et al. (1963) Allocation of costs in joint forest drainage und.. Silva Fennica vol. no. 115 article id 4716
Heikurainen L., Seppälä K. (1965) Regionality in stand increment and its dependenc.. Acta Forestalia Fennica vol. 78 no. 4 article id 7157
Heikurainen L., Seppälä K. (1963) The effect of drainage degree on temperature con.. Acta Forestalia Fennica vol. 76 no. 4 article id 7144
Keltikangas M., Laine J. et al. (1986) Peatlands drained for forestry during 1930–1978:.. Acta Forestalia Fennica vol. 0 no. 193 article id 7639
Heikurainen L., Seppälä K. (1973) Regional variation and continuity of stand growt.. Acta Forestalia Fennica vol. 0 no. 132 article id 7566
Seppälä K., (1972) Ditch spacing as a regulator of post-drainage st.. Acta Forestalia Fennica vol. 0 no. 125 article id 7559
Seppälä K., (1969) Post-drainage growth rate of Norway spruce and S.. Acta Forestalia Fennica vol. 0 no. 93 article id 7611