Titre du document / Document title

Mechanized microsite preparation and direct seeding of Pinus sylvestris in boreal forests : a way to create desired spacing at low cost

Auteur(s) / Author(s)

WENNSTRÖM U. ⁽¹⁾ ; BERGSTEN U. ⁽²⁾ ; NILSSON J.-E. ⁽³⁾ ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

⁽¹⁾ The Forestry Research Institute of Sweden, Box 3, 918 21 Sävar, SUEDE
⁽²⁾ Department of Silviculture, The Swedish University of Agricultural Sciences, 901 83 Umeå, SUEDE
⁽³⁾ Department of Forest Genetics and Plant Physiology, The Swedish University of Agricultural Sciences, 901 83 Umeå, SUEDE

Résumé / Abstract

The main objective of this study was to examine the cost, flexibility, and appropriate scale of mechanized microsite preparation (MP), in combination with mechanical direct seeding of Pinus sylvestris L. with orchard seed. This technique was tested at four boreal forest sites in Northern Sweden. Orchard and stand seeds were sown with and without MP. The use of orchard seed increased seedling establishment by 41% and the use of MP increased seedling establishment by 47%, respectively, after two years. The best substrates for sowing when using MP were OA_h-, E- and BC-horizon, in ranked order. The use of orchard seed compared to stand seed increased mean seedling height by 25% after four years, These trials suggest that to obtain a density of 5,000 stems ha^-1 four years after seeding, 61,000 viable stand seeds or 41.000 orchard seeds ha^-1 should be sown if MP is not used. If MP is used, seeding rate could be reduced by about 32%. By using MP, and by further improving scarification technique so that all scarified area is thin OA_h-horizon, we predict that only 32,000 stand seeds of 22.000 orchard seeds ha^-1, i.e., half the dosage, should be needed. Under these optimal conditions, it would be necessary to sow about six and four germinable stand and orchard seeds, respectively, to ensure one seedling after four years. Furthermore, regeneration cost would be less than a third that of planting.

Revue / Journal Title

New forests   ISSN 0169-4286   CODEN NEFOE6 

Source / Source

1999, vol. 18, n^o2, pp. 179-198 (2 p.1/4)

Langue / Language

Anglais

Editeur / Publisher

Kluwer, Dordrecht, PAYS-BAS  (1986) (Revue)

Mots-clés anglais / English Keywords

Forests ; Spacing ; Taiga ; Substrate ; Seedlings ; Plant emergence ; Stem ; Seed orchard ; Plant juvenile growth stage ; Pinus sylvestris ; Planting density ; Direct sowing ; Mechanical method ; Sweden ; Field study ; Soil tillage ; Site preparation ; Coniferales ; Gymnospermae ; Spermatophyta ; Europe ; Forest regeneration ; Softwood forest tree ; Scandinavia ;

Mots-clés français / French Keywords

Forêt ; Espacement ; Taïga ; Substrat ; Plant semis ; Levée plante ; Tige ; Verger à graine ; Stade juvénile plante ; Pinus sylvestris ; Densité plantation ; Semis direct ; Méthode mécanique ; Suède ; Etude sur terrain ; Travail sol ; Préparation site ; Coniferales ; Gymnospermae ; Spermatophyta ; Europe ; Régénération forestière ; Arbre forestier résineux ; Pays Scandinaves ;

Mots-clés espagnols / Spanish Keywords

Bosque ; Espaciamiento ; Taiga ; Substrato ; Plantón semillero ; Emergencia planta ; Tallo ; Huerto semillero ; Estado juvenil planta ; Pinus sylvestris ; Densidad plantación ; Sembrado directo ; Método mecánico ; Suecia ; Estudio en campo ; Labranza ; Preparación sitio ; Coniferales ; Gymnospermae ; Spermatophyta ; Europa ; Regeneración forestal ; Arbol forestal resinoso ; Países escandinavos ;

Localisation / Location

INIST-CNRS, Cote INIST : 21225, 35400008787427.0050