Mikko Tormilainen. (1972). Havaintoja Oitin siemenviljelyksen mäntykloonien kukinnasta ja käpysadosta. Silva Fennica vol. 6 no. 2 article id 4868. https://doi.org/10.14214/sf.a14671

English title: Studies of flowering and cone crop in a seed orchard of Scots pine.

Original keywords: Etelä-Suomi; mänty; kloonit; siemenviljelmä; siemenviljely; kukinta; käpysato; geneettinen vaihtelu

English keywords: Pinus sylvestris; Scots pine; flowering; genetic variation; seed orchards; clones; Southern Finland; cone production

Abstract | View details | Full text in PDF | Author Info

Male and female flowering, cone crop, and some vegetative characteristics were studied in grafts 10 to 16 years of age in a clonal seed orchard of Scots pine (Pinus sylvestris L.). Genetic variation was found between clones in flowering as well as in cone production. Clone evaluation resulted in similar classifications of clones in different years. A regression analysis showed that crown size clearly increased but previous height growth slightly decreased flowering and cone production. The percentage of pollinated female strobili did not differ between clones.

The PDF includes a summary in English.

Tormilainen, E-mail: mt@mm.unknown

Category : Research article

article id 23073, category Research article

Curt Almqvist. (2024). High stand density improves seed production in seed orchards of the masting species Picea abies. Silva Fennica vol. 58 no. 3 article id 23073. https://doi.org/10.14214/sf.23073

Keywords: Norway spruce; thinning; cone production

Highlights: Cone production per tree in a Picea abies seed orchard is independent of stand density up to at least 800 stems ha^–1; The higher the stand density, the higher per hectare cone production will be in the seed orchard.

Abstract | Full text in HTML | Full text in PDF | Author Info

Reproduction in masting species is characterised by long intervals between good cone and seed production years, and only sparse reproduction between mast years. The physiological mechanisms behind masting, and how these are linked to internal resource status and external weather factors, is still a subject of scientific exploration and debate, as is the effect of climate change on masting. This study investigates cone production in one operational seed orchard in Sweden which was established with two different spacings and has since been subject to three tree thinning experiments. The spacings before thinning varied between 800 and 400 stems ha^–1, and then thinning reduced the stand density in all trials to half, i.e. between 400 and 200 stems ha^–1. In all three experiments cone production per tree was equal in un-thinned and thinned treatments, both in mast years and in non-mast years. Thus, the cone production per unit area was twice as high in the un-thinned areas. The conclusion from these experiments is that the establishment of Picea abies (L.) H. Karst. seed orchards with wide tree spacing is both a misuse of good orchard locations and bad economics.

Almqvist, Skogforsk, Uppsala Science Park, SE-75183 Uppsala, Sweden https://orcid.org/0000-0001-5739-4854 E-mail: curt.almqvist@skogforsk.se

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