In:
International Journal of Forestry Research, Hindawi Limited, Vol. 2012 ( 2012), p. 1-9
Abstract:
We tested the hypothesis that changes in leaf area index (LAI m 2 m −2 ) and mean stand diameter following thinning are due to thinning type and residual density. The ratios of pre- to postthinning diameter and LAI were used to assess structural changes between replicated crown, dominant, and low thinning treatments to 33% and 50% residual density in even-aged Picea rubens and Abies balsamea stands with and without a precommercial thinning history in Maine, USA. Diameter ratios varied predictably by thinning type: low thinnings were 〈 0.7, crown thinnings were 〉 0.7 but 〈 1.0, and dominant thinnings were 〉 1.0 . LAI change was affected by type and intensity of thinning. On average, 33% density reduction removed 〈 50% of LAI, whereas 50% density reduction removed 〉 50% of LAI. Overall reduction of LAI was generally greatest in dominant thinnings (54%), intermediate in crown thinnings (46%), and lowest in low thinnings (35%). Upon closer examination by crown classes, the postthinning distribution of LAI between upper and lower crown classes varied by thinning history, thinning method, and amount of density reduction.
Type of Medium:
Online Resource
ISSN:
1687-9368
,
1687-9376
Language:
English
Publisher:
Hindawi Limited
Publication Date:
2012
detail.hit.zdb_id:
2487115-1
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