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Articles by Petter Nilsen

Category: Research article

article id 406, category Research article
Bernt-Håvard Øyen, Petter Nilsen. (2004). Growth and recruitment after mountain forest selective cutting in irregular spruce forest. A case study in Northern Norway. Silva Fennica vol. 38 no. 4 article id 406. https://doi.org/10.14214/sf.406
During the last thirty years the interest for the use of selective cutting in the sub-alpine spruce forests of Norway has increased. However, there have been very few investigations on the post harvesting development after such cuttings. Four plots in irregular Norway spruce (Picea abies (L.) Karsten) dominated forests on semi-fertile sites in Northern Norway have been the subjects of a case study. We performed a reconstruction of the stand development by means of biometric assessments and ring widths measurements of all standing trees. Tree ages, stand structure, growth and recruitment were examined. Even though a hypothetical reverse J-curve for the present diameter distribution was identified, the four plots were even-aged. Growth reactions indicate that most of the present sawtimber trees were established after heavy dimension cuttings in the late 19th century. The recruitment situation is characterized as satisfying in one of four plots. The post harvesting mean volume increment on the plots have been about two thirds of the potential yield estimated from site indices and maximum mean annual increment in regular stands. Managing strategies for irregular spruce forest stands are briefly discussed.
  • Øyen, Norwegian Forest Research Institute-Bergen, Fanaflaten 4, N-5244 Fana, Bergen, Norway ORCID ID:E-mail: bernt-havard.oyen@skogforsk.no (email)
  • Nilsen, Norwegian Forest Research Institute-Bergen, Fanaflaten 4, N-5244 Fana, Bergen, Norway ORCID ID:E-mail:

Category: Research note

article id 1024, category Research note
Petter Nilsen, Line Tau Strand. (2013). Carbon stores and fluxes in even- and uneven-aged Norway spruce stands. Silva Fennica vol. 47 no. 4 article id 1024. https://doi.org/10.14214/sf.1024
Highlights: Long term (81 years) C sequestration is slightly higher in an even-aged compared to an uneven-aged spruce stand; The even-aged stand has at 81 years age a slightly lower soil C content than the uneven-aged stand; Present C fluxes indicate that the difference in long term C sequestration will increase in favour the even-aged stand if final felling is postponed.
This investigation compares present C stores, fluxes and historic tree C sequestration in an uneven-aged and an even-aged Norway spruce stand under similar high productive soil conditions in south-eastern Norway. A selection cutting system has been performed in the uneven-aged forest stand for 81 years and the even-aged stand was established after clear-cutting 81 years ago. Timber productivity has been measured in the uneven stand for 81 years and in the even-aged stand for 52 years. C storage was determined based on tree measurements, tree biomass functions, soil samples and C analyses from trees and soil. Litter fall was sampled during one year and CO2 efflux from the soil was measured during one growing season. The present tree C storage (including roots) was 210 Mg C ha-1 in the even-aged stand and 76 Mg C ha-1 in the uneven-aged stand, while the corresponding figures for C in the soil was 178 and 199 Mg C ha-1. The long term timber production in the uneven-aged stand was measured to be 95% of the even-aged stand and the difference in net C sequestration was 37 Mg ha-1 in an 81 year period in favour the even-aged stand. The highest present CO2 efflux from soil was measured in the even-aged stand. The total net C sequestered in trees during 81 years minus the present soil C-stock accounts to 16 Mg ha-1 in favour the even-aged system
  • Nilsen, The Research Council of Norway, P.O. Box 2700, St. Hanshaugen, N-0131 Oslo, Norway ORCID ID:E-mail: pn@rcn.no (email)
  • Strand, Department of Plant and Environmental Sciences, Norwegian University of Life Sciences, P.O. Box 5003, N-1432 Ås, Norway ORCID ID:E-mail: line.strand@umb.no

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