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Influence of mechanical site preparation on regeneration success of planted conifers in clearcuts in Fennoscandia-a review

Sikstrom, Ulf and Hjelm, Karin and Hanssen, Kjersti Holt and Saksa, Timo and Wallertz, Kristina (2020). Influence of mechanical site preparation on regeneration success of planted conifers in clearcuts in Fennoscandia-a review. Silva Fennica. 54 :2 , 10172 , 1-35
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Abstract

In the Nordic countries Finland. Norway and Sweden, the most common regeneration method is planting after clearcutting and, often, mechanical site preparation (MSP). The main focus of this study is to review quantitative effects that have been reported for the five main MSP methods in terms of survival and growth of manually planted coniferous seedlings of Norway spruce (Picea abies (L.) Karst.), Scots pine (Pinus sylvestris L.) and lodgepole pine (Pinus contorta var. latifolia Engelm.) in clearcuts in these three countries. Meta analyses are used to compare the effects of MSP methods to control areas where there was no MSP and identify any relationships with temperature sum and number of years after planting. In addition, the area of disturbed soil surface and the emergence of naturally regenerated seedlings are evaluated. The MSP methods considered are patch scarification, disc trenching, mounding, soil inversion and ploughing. Studies performed at sites with predominately mineral soils (with an organic topsoil no thicker than 0.30 m), in boreal, nemo-boreal and nemoral vegetation zones in the three Fenno-Scandinavian countries are included in the review. Data from 26 experimental and five survey studies in total were compiled and evaluated. The results show that survival rates of planted conifers at sites where seedlings are not strongly affected by pine weevil (Hylobius abietis L.) are generally 80-90% after MSP, and 15-20 percent units higher than after planting in non-prepared sites. The experimental data indicated that soil inversion and potentially ploughing (few studies) give marginally greater rates than the other methods in this respect. The effects of MSP on survival seem to be independent of the temperature sum. Below 800 degree days, however, the reported survival rates are more variable. MSP generally results in trees 10-25% taller 10-15 years after planting compared to no MSP. The strength of the growth effect appears to be inversely related to the temperature sum. The compiled data may assist in the design, evaluation and comparison of possible regeneration chains, i.e. analyses of the efficiency and cost-effectiveness of multiple combinations of reforestation measures.

Authors/Creators:Sikstrom, Ulf and Hjelm, Karin and Hanssen, Kjersti Holt and Saksa, Timo and Wallertz, Kristina
Title:Influence of mechanical site preparation on regeneration success of planted conifers in clearcuts in Fennoscandia-a review
Year of publishing :2020
Volume:54
Number:2
Article number:10172
Number of Pages:35
Publisher:The Finnish Society of Forest Science
ISSN:0037-5330
Language:English
Publication Type:Article Review/Survey
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution-Noncommercial-Share Alike 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
Keywords:coniferous seedlings, disturbed soil surface, natural regeneration, regeneration chain, seedling growth, seedling survival
URN:NBN:urn:nbn:se:slu:epsilon-p-105684
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-105684
Additional ID:
Type of IDID
DOI10.14214/sf.10172
Web of Science (WoS)000530087000003
ID Code:17093
Faculty:S - Faculty of Forest Sciences
Department:(S) > Unit for Field-based Forest Research
Deposited By: SLUpub Connector
Deposited On:09 Jun 2020 13:31
Metadata Last Modified:09 Jun 2020 13:31

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