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Multi-layered Scots pine forests in boreal Sweden result from mass regeneration and size stratification

Lundqvist, Lars and Ahlström, Martin and Axelsson, Petter and Mörling, Tommy and Valinger, Erik (2019). Multi-layered Scots pine forests in boreal Sweden result from mass regeneration and size stratification. Forest Ecology and Management. 441 , 176-181
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Official URL: https://doi.org/10.1016/j.foreco.2019.03.044

Abstract

Understanding historic development of multi-layered Scots pine (Pinus sylvestris L.) stands and how they became multi-layered is essential for assessing the feasibility of using the selection system in these stands. To address this we measured trees (dbh ≥ 4 cm) and saplings (height > 0.5 m dbh < 4 cm) and used increment cores from 244 sample trees to reconstruct stand structure development, ingrowth and basal area increment in four multi-layered Scots pine stands in Sweden. Age distributions were quite homogeneous, three of the four stands had age distributions that were dominated by one or two 20 year age classes, suggesting that the irregular diameter distributions displayed in 2013 had developed from more homogeneous distributions. Analyses of the historical ingrowth of Scots pine into the tree layer suggested that the multi-layered structure was created by mass regeneration followed by size stratification caused by differences in growth rates within even-aged cohorts of regeneration. Large reductions of the basal area in the past resulted in abundant regeneration and ingrowth of Scots pine. When the over-story increased in basal area over time, there was a growth differentiation among the saplings and small trees, gradually creating a multi-layered stand structure as some of the trees grew into the larger size classes while others remained in the smaller size classes. When the stands reached a basal area of about 13 m2 ha−1 the ingrowth of saplings past 1.3 m height essentially stopped but the size stratification among the small trees continued, further enhancing the multi-layered structure. The results indicate that to receive regeneration pulses and sustain a multi-layered structure in Scots pine forests, the basal area needs to be significantly reduced. The growth consequences of this need to be studied.

Authors/Creators:Lundqvist, Lars and Ahlström, Martin and Axelsson, Petter and Mörling, Tommy and Valinger, Erik
Title:Multi-layered Scots pine forests in boreal Sweden result from mass regeneration and size stratification
Year of publishing :2019
Volume:441
Page range:176-181
Number of Pages:6
Publisher:Elsevier
ISSN:0378-1127
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution-Noncommercial-No Derivative Works 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
Keywords:multi-layered forests, Scots pine stands, basal areas, historic development, regeneration, stratification, forestry
URN:NBN:urn:nbn:se:slu:epsilon-p-99604
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-99604
Additional ID:
Type of IDID
DOI10.1016/j.foreco.2019.03.044
ID Code:16112
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Ecology and Management
(S) > Dept. of Wildlife, Fish and Environmental Studies
Deposited By: SLUpub Connector
Deposited On:21 May 2019 10:51
Metadata Last Modified:21 May 2019 10:51

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