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Report, 2014

Stem and merchantable volume equations for hybrid aspen growing on formland in Sweden

Johansson, Tord

Abstract

In this study, stem volume models for hybrid aspen were developed. The study was based on 29 stands located in middle and southern Sweden (latitudes 55 – 60° N.). The mean total age of the hybrid aspen was 22 years (range 15 – 50 years) with a mean stand density of 1006 stems ha-1 (90 – 2402) and a mean diameter at breast height (over bark) of 19.7 cm (8.5 – 40.8 cm). A number of equations were assessed for modeling stem volume. Standing volume was examined in relation to soil type. Multiple samples were collected for three types of soils: sediments of light clay and medium clay and till soils. A power equation, V = β0Dβ1Hβ2, fits the data best. This model explained 99% of the observed variation in prediction of observed data and exhibited no apparent bias across the range of predicted stem volumes. Merchantable volume equations for the estimation of commercial volume for any top diameters and bole length were developed. They explained 99% of the observed variation in prediction of observed data. Soil types in the stands were light and medium clays and tills. The standing volume was calculated, the mean was 301±167 (range 111-701) m3 ha-1. Mean annual increment was also calculated, the mean was 14.6±8.0 (range 2.8-36.9 m3 ha-1 year-1. There were no significant differences between the soil types and MAI.

Keywords

farmland, hybrid aspen, MAI, merchantable volume, soil type, stands, stem volume, total age

Published in

Rapport (Institutionen för energi och teknik, SLU)
2014, number: 075
Publisher: Sveriges lantbruksuniversitet, Institutionen för energi och teknik

Authors' information

Johansson, Tord
Swedish University of Agricultural Sciences, Department of Energy and Technology

UKÄ Subject classification

Forest Science

URI (permanent link to this page)

https://res.slu.se/id/publ/62914