Suo - Mires and peat vol. 38 no. 1 | 1987
Ojituksen ja lannoituksen vaikutukset sammalten typpi- ja fosforipitoisuuksiin kahdella suomuuttumalla.
English title: Effects of drainage and fertilization on nitrogen and phosphorus contents of mosses in two drained peatland forests.
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The short-term effects of wood ash, PK and NPK fertilizers on total N and P contents of various mosses at an old drainage area in eastern Finland are studied.
Total N contents increased after NPK treatment and total P contents increased after treatments that contained phosphorus (NPK, PK, wood ash). N contents of some mosses also increased after treatments which did not contain any nitrogen (PK and wood ash). On these plots drainage and obviously the fertilizer treatment fastened the decomposition rate of the peat and at the same time the mobilization of the nutrients.
On the control plots (no fertilization) the N contents of the mosses did not differ statistically between the years in either of the study sites. The P contents of some mosses decreased on the control plots of the spruce swamp. One reason for this was apparently the level of the ground water, which did not lower so much in the spruce swamp than in the pine mire, and so the mobilization of the nutrients remained smaller.
The observed nutrient contents of the peat mosses were much smaller than those of the forest mosses and the nutrient contents were also smaller at pine mire than at spruce swamp.
Keywords: bryophytes, fertilization, drained peatlands, nitrogen, phosphorus.
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Jäppinen,
University of Joensuu. Department of Biology. P.O. Box 111, SF-80101 Joensuu, Finland
Sähköposti:
ei.tietoa@nn.oo
Soiden kaytöstä Minnesotassa (USA).
English title: The utilization of peatlands in Minnesota (USA).
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Minnesota's peatland resources are described, and their historical, current, and prospective uses are reviewed. Minnesota has a large peat resource that has not been intensively utilized. The state government actively encourages both the industrial development of peatlands and the preservation of significant natural peatlands. Future peatland utilization in Minnesota will probably not be monopolized by a single use, for example, traditional fuel peat production.
Key words: Minnesota, peatland utilization, peat utilization.
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Rengo,
Center for Environmental Studies, Bemidji State University, Bemidji, Minnesota 55601, USA: and Department of Botany, University of Turku, SF-20500 Turku, Finland
Sähköposti:
ei.tietoa@nn.oo
Kasvillisuuden uusiutumisesta turvetuotantoa varten raivatulla alueella Ähtärin Mustasuolla.
English title: Revegetation of an area of Mustasuo-mire after clearing for peat harvesting.
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The structure of the vegetation in an area abandoned 13 years ago after clearing for fuel peat production was investigated in Ähtäri, Finland. The vegetation consisted of 13 plant species, all of which were typical bog-species. The average above ground dry weight biomass for the whole vegetation was 240 g/m2. The proportions of the total biomass for the shrub layer, field layer and ground layer were 46 %, 38 % and 16 %, respectively. In the field layer 78 % of the total biomass was formed by woody species. Polytrichum strictum formed 99,6 % of the total biomass of the ground layer. Revegetation had occurred unevenly; large openings with no plant cover were found, especially in the middle of the strips.
Keywords: peat harvesting, revegetation, vegetation structure
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Salonen,
University of Jyväskylä, Department of Biology, Yliopistonkatu 9, SF-40100 Jyväskylä, Finland
Sähköposti:
ei.tietoa@nn.oo
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