Artikkelin koko teksti on saatavilla vain PDF-formaatissa.

Hannu Hökkä (email), Virpi Alenius, Hannu Salminen

Kunnostusojitustarpeen ennustaminen ojitusalueilla

Hökkä H., Alenius V., Salminen H. Kunnostusojitustarpeen ennustaminen ojitusalueilla.

English title: Predicting the need for ditch network maintenance in drained peatland sites in Finland

Tiivistelmä

Logistic regression models were developed to predict the condition of ditch networks in drained peatland sites in Finland. The data consisted of observations from two forest inventories in which the need for ditch network maintenance had been assessed in the field by classifying the condition of the ditches in the sample stands. In the analysis an indicator variable which referred to one of two condition categories (in need of repair – not in need of repair) was used as the response variable. According to the results, the probability of being in the poor condition category was higher in sites where the time elapsed since drainage was longer, the geographic location was more northern, peat thickness was greater, and plot inclination was smaller. At a probability level of 0.5, the models predicted the category correctly in 69% of the sites in the modeling data, on average. The models were applied to a growth simulator to study the effect of poor drainage conditions on stand-level growth forecasts.

Avainsanat
forest drainage; ditch network maintenance; logistic regression; site

Tekijät
  • Hökkä, Finnish Forest Research Institute, Rovaniemi Research Station, P.O. Box 16, FIN-96301 Rovaniemi, Finland Sähköposti ei.tietoa@nn.oo (sähköposti)
  • Alenius, Sähköposti ei.tietoa@nn.oo
  • Salminen, Sähköposti ei.tietoa@nn.oo

Vastaanotettu 31.10.2017 Julkaistu 1.1.2000

Katselukerrat 785

Saatavilla http://suo.fi/article/9786 | Lataa PDF

Creative Commons License CC BY-NC-ND 4.0

Rekisteröidy
Click this link to register to Suo - Mires and peat.
Kirjaudu sisään
Jos olet rekisteröitynyt käyttäjä, kirjaudu sisään tallentaaksesi valitsemasi artikkelit myöhempää käyttöä varten.
Ilmoitukset päivityksistä
Kirjautumalla saat tiedotteet uudesta julkaisusta
Valitsemasi artikkelit
Hakutulokset
Hökkä H., Alenius V. et al. (2000) Predicting the need for ditch network maintenanc.. Suo - Mires and peat vol. 51 no. 1 artikkeli 9786