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Report2005

Upprepad röjning av björk och korgvide

Johansson Tord, Lundh Jan-Erik

Abstract

Sprouting and growth after repeated cleaning of birch (Betula pendula Roth) and basket willow (Salix viminalis L.) was studied. The study was focussed on the influence of number of cleanings and the date of cleaning operation on the ability of sprouting. Two experiments were laid out in Dalarna (Lat 60˚ 15’ N. Long. 16˚ 00’ E. ; Lat. 60˚ 23’ N. Long. 14˚ 51’ E.) in May 2000. The birch study was located on a fresh site in forest land and the study on basket willow was located on former farmland. The treatments was made in May and middle of July during 2000 to 2004. The number of stumps was 60 per treatment. The tested treatments were 16. Two stump heights 25 cm (normal) and 5 cm (low) were studied. In a third experiment (Lat. 60˚ 53’ N. Long 14˚ 52’ E.) sprouts of birches which earlier were cleaned. The birch sprouts were cleaned to a low stump height. The experiment started in May 2003. The birches were growing on a fresh forest type close to the railway in middle Dalarna. Two treatments were practised: half of the plot area (30m2) was cleaned once and the other half twice during 2003. The treated birch and willow stumps were annually examined. The percentage birch stumps without sprouts five years after treatment was higher after repeated cleaning than after one cleaning. The highest percentage stumps without sprouts, 80%, was registered for cleaning to low stump height repeated once the same year. The percentage basket willow sprouts was higher after repeated than single cleaning. After five years the percentage stumps without sprouts was 93% for stumps with a low stump height and 85% for stumps with a normal stump height. The number of sprouts per stump decreased during the studied period for all treatments. The lowest number of sprouts was found for low stumps cleaned repeated during the year. In the birch study with cleaned clumps of birch the number of sprouts after repeated cleaning was 50% of the number after a single cleaning

Published in

Rapport - Institutionen för bioenergi
2005, number: 6Publisher: Bengt Hillring