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Articles containing the keyword 'forestry investment analysis'
Category : Research article
article id 146,
category
Research article
(2010).
Effect of soil preparation method on economic result of Norway spruce regeneration chain.
Silva Fennica
vol.
44
no.
3
article id 146.
https://doi.org/10.14214/sf.146
Keywords:
Picea abies;
soil preparation;
cleaning;
disc trenching;
forestry investment analysis;
pre-commercial thinning;
regeneration chain;
spot mounding;
sprouting
Abstract |
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Author Info
Economic result of forest regeneration chains, based either on spot mounding or on disc trenching and planting of Norway spruce (Picea abies [L.] Karst.) seedlings, were clarified and compared to each other. First, effects of soil preparation method on early development of Norway spruce stands were measured from field experiments. Second, the effects of soil preparation method on stand level management programs were modelled. The modelling was based on growth simulation and investment calculations. The soil preparation methods substantially affected early development of a stand. The density of the removed trees in early cleaning was 56% higher on the disc-trenched area compared to the spot-mounded area. The difference was especially high (120%), close by (< 25 cm) the remained spruce seedlings. There was also a difference between the methods in the growth of crop spruces; at biological age of 8 years, the mean height of spruce was 110 cm on the spot-mounded area and 68 cm on the disc-trenched area. The differences led to divergent management programs between the areas. The disc-trenched area needed three young stand management operations whereas two was enough at the spot-mounded area. Although disc trenching is a less expensive method than spot mounding, the total management costs were higher in disc trenching than in spot mounding. Furthermore, incomes from the first commercial thinning were higher when regeneration based on spot mounding. At the interest rate of 3%, the investment in spot mounding had 329 EUR ha–1 higher net present value than the investment in disc trenching.
-
Uotila,
Finnish Forest Research Institute, Suonenjoki, Finland
E-mail:
karri.uotila@metla.fi
- Rantala, Finnish Forest Research Institute, Suonenjoki, Finland E-mail: jr@nn.fi
- Saksa, Finnish Forest Research Institute, Suonenjoki, Finland E-mail: ts@nn.fi
- Harstela, Finnish Forest Research Institute, Suonenjoki, Finland E-mail: ph@nn.fi
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