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Reforestation by direct seeding of beech and oak

influence of granivorous rodents and site preparation

Birkedal, Maria (2010). Reforestation by direct seeding of beech and oak. Diss. (sammanfattning/summary) Alnarp : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2010:13
ISBN 978-91-576-7490-6
[Doctoral thesis]

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Abstract

In southern Scandinavia there is a general desire to increase the amount of broadleaved forest using, for example, beech and oak, in order to preserve biodiversity and spread risk in the face of climate change. In order to realise this goal cheaper regeneration methods are needed. Although there are a number of uncertainties at present, direct seeding has the potential to fulfill this role. Two of the greatest obstacles to successful regeneration of beech and oak using direct seeding are seed removal by granivorous rodents and competition from ground vegetation. These issues need to be addressed before direct seeding can become a reliable regeneration method. The work described in papers I, II and IV in this thesis investigated the influence of site, sowing dates, rodent population densities, site preparation and repellents on rodent damage to sown beech nuts and acorns. Paper III describes a study which examined the effect of different mechanical site preparation methods, and different sowing dates, on the growth of young oak seedlings. Seedling establishment was more successful at large sites surrounded by mixed forests, compared to smaller areas surrounded by broadleaved forest (I, II). Oak seedling establishment was more successful than that of beech. Fewer acorns were lost and seedling establishment was better following spring sowing compared with summer sowing. In all years, more rodents were captured in the summer/autumn period than the spring. However, no clear correlation between rodent numbers and the success of direct seeding could be established. More rodents were captured in traps close to features providing cover, for example slash piles and the remains of stone walls. There were no clear relationships between the various mechanical site preparation treatments and rodent distribution and seed removal. In a laboratory study, mink excrement was found to have potential as a bank vole repellent, since it reduced consumption of beech nuts to half that of water soaked seeds, and reduced consumption of acorns was also indicated. No decrease in the germination of acorns treated with mink excrement was found, and there was only a minor negative effect on beech nuts (IV). The growth of young oak seedlings was better following sowing in spring than in summer, and mounding was the mechanical site preparation treatment most beneficial for oak seedling growth (III). The results indicate that successful direct seeding of oak on clear-cuts is most likely when acorns are sown at large sites situated in areas surrounded by coniferous forest, in spring rather than summer. In addition, more successful regeneration could be achieved through preparing sites by mounding, removing slash and sowing seeds treated with mink excrement. The data collected in this study indicate it is more difficult to achieve successful direct seeding of beech, than of oak.

Authors/Creators:Birkedal, Maria
Title:Reforestation by direct seeding of beech and oak
Subtitle:influence of granivorous rodents and site preparation
Year of publishing :2010
Volume:2010:13
Number of Pages:41
Papers/manuscripts:
NumberReferences
ALLI Birkedal, M., Fischer, A., Karlsson, M., Löf, M. & Madsen, P. (2009)Rodent impact on establishment of direct-seeded Fagus sylvatica, Quercus robur and Quercus petraea on forest land. Scandinavian Journal of Forest Research 24, 298-307. II Birkedal, M., Löf, M., Olsson, G.E. & Bergsten, U. (2010) Effects of granivorous rodents on direct seeding of beech and oak in relation to site preparation and sowing date. Manuscript III Löf, M. & Birkedal, M. (2009) Direct seeding of Quercus robur L. for reforestation: The influence of mechanical site preparation and sowing date on early growth of seedlings. Forest Ecology and Management 258, 704-711. IV Birkedal, M. & Olsson, G.E. (2010) Mink excrement – a potential repellent to prevent bank vole consumption of direct seeded beech nuts and acorns. Manuscript
Place of Publication:Alnarp
ISBN for printed version:978-91-576-7490-6
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:K Forestry > K01 Forestry - General aspects
Subjects:Not in use, please see Agris categories
Agrovoc terms:quercus, fagus, sowing, seedlings, site preparations, site factors, rodents, population density
Keywords:Fagus sylvatica L., forest restoration, granivorous rodents, pest control, Quercus petraea (Matt.) Liebl., Quercus robur L., regeneration, repellents, seed removal, site preparation
URN:NBN:urn:nbn:se:slu:epsilon-3054
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-3054
ID Code:2243
Department:(S) > Southern Swedish Forest Research Centre
Deposited By: Maria Birkedal
Deposited On:05 Mar 2010 00:00
Metadata Last Modified:02 Dec 2014 10:17

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