Artikkelit jotka sisältää sanan 'stand volume'
Pinus sylvestris L. stands in three fertilized and drained peatlands in northern Finland.
English title: The effect of total peat nitrogen on the height and volume of Scots pine.
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The total peat nitrogen (N) concentration is an important factor when determining stand heights and volumes in areas of poor climate conditions. This study explores the effect of peat nitrogen on the height and volume of Scots pine (Pinus sylvestris L.) stands in drained peatland sites in three temperature sum regions (Susivaara 909, Hepokangas 930, and Haapua 987 dd) in northern Finland. The peat nitrogen concentration ranged from 0.7% to 3.0%. In all experimental fields, the concentrations of foliar nutrients (nitrogen (N), potassium (K), phosphorus (P), and boron (B)) were analyzed. A total of 550 peat samples, 440 foliar samples, and 1687 sample trees were measured. We found nitrogen deficiencies in the foliar samples of all experimental fields. At Haapua, the stands were the highest, about 140 dm, when the peat N-concentration was at its maximum (3.0%). In the areas of Susivaara and Hepokangas, the stand heights were lower than in Haapua, about 90 dm, when N-concentrations of peat were at their maximum (2.5% and 2.8%). The stand volumes were largest at Haapua (about 190 m3/ha, N = 3.0%). At Susivaara (80 m3/ha, N = 2.5%) and Hepokangas (70 m3/ha, N = 2.8%), lower stand volumes were measured. We found a strong positive relationship between peat N-concentration and stand height as well as stand volume at Hepokangas and Haapua. At Susivaara, however, this relationship was weak. The results show that the total peat nitrogen concentration strongly affects stand height and volume on drained peatlands. The information of this study can be utilized, for example, when assessing the feasibility of forest management practices, such as the profitability of ditch network maintenance and fertilizations on peatlands.
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Korkalainen,
University of Joensuu, Department of Geography, P.O. Box 111, 80101 Joensuu, Finland
Sähköposti:
ei.tietoa@nn.oo
- Pietiläinen, Sähköposti: ei.tietoa@nn.oo
- Colpaert, Sähköposti: ei.tietoa@nn.oo
Metsäojien jatkuvan kunnossapidon vaikutus ojitusalueiden tilaan Keski-Pohjanmaalla.
English title: Effects of continuous ditch network maintenance on the condition of forest drainage areas in Central Ostrobothnia district.
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The estimated annual need for ditch network maintenance in Finnish peatland forests is over 100 000 hectares, most of it consisting of ditch cleaning. However, there are not enough funds available for the needs of remedial ditching. In addition, environmental aspects in peatland forestry must be considered more than in the past. Thus, it is necessary to evaluate alternative work methods of ditch network maintenance. This paper presents the effects of continuous ditch network maintenance on the dimensions and the condition of ditches, as well as on the development of the tree stands on ditched sites.
Key words: Alternative excavating methods, ditch maintenance, forest drainage, stand volume
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Isoaho,
The Finnish Forest Research Institute, Kannus Research Station, FIN-69100 Kannus, Finland
Sähköposti:
ei.tietoa@nn.oo
- Lauhanen, Sähköposti: ei.tietoa@nn.oo
- Saarinen, Sähköposti: ei.tietoa@nn.oo
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