Umfang:
Getr. Zählung
,
Ill., graph. Darst.
ISBN:
9157660808
Serie:
Acta Universitatis Agriculturae Sueciae / Silvestria 196
Inhalt:
The objective of the present thesis was to examine the effects of silvicultural treatments and seed dispersal from surrounding stands on the establishment of natural regeneration of broadleaved tree species in southern Sweden. Most of the broadleaved tree species that occur naturally in forests in southern Sweden were studied but birch (Betula pendula Ehrh./B. pubescens Roth) was the most common species and present in equal numbers in all studies. The wind dispersal of seeds of seven species was studied and great variations were found. This could mainly be explained by differences in seed morphology. The effect of soil scarification was examined in all five studies and was generally found to be positive for the establishment of the studied broadleaved species. However, in some cases the scarification was not positive for the establishment. The reason for this was hypothesised to be that the seed supply was limited, or an effect of large and/or animal-dispersed seeds. The effect of shelterwood was examined in three studies and was found to be positive for animal-dispersed species but negative for shade-intolerant species, although a sparse shelterwood can be used to regenerate birch. Slash removal was included in one study and found to be positive for the establishment of birch. This thesis showed that regeneration treatments can be used to increase the establishment of naturally regenerated broadleaved tree seedlings, but the stand structure and species composition must be regulated with pre-commercial thinning. However, the effect of variations in seed production and seed dispersal must be closely examined from a time and a space perspective prior to any forecasts regarding the effects of regeneration treatments.
Anmerkung:
Zugl.: Alnarp, Sveriges Lantbruksuniv., Diss., 2000
Sprache:
Englisch
Schlagwort(e):
Hochschulschrift
