Climatic adaptation of Norway spruce (Picea abies (L.) Karsten) in Finland based on male flowering phenology.

Show simple item record Luomajoki, Alpo 2011-07-21T13:15:32Z 2011-07-21T13:15:32Z 1993
dc.identifier.citation Acta Forestalia Fennica. 1993. 242: 1-28. fi
dc.identifier.issn 0001-5636
dc.description.abstract Anthesis was studied at the canopy level in 10 Norway spruce stands from 9 localities in Finland from 1963 to 1974. Distributions of pollen catches were compared to the normal Gaussian distribution. The basis for the timing studies was the 50 per cent point of the anthesis-fitted normal distribution. Development up to this point was given in calendar days, in degree days (>5 °C) and in period units. The count of each parameter began on March 19 (included). Male flowering in Norway spruce stands was found to have more annual variation in quantity than in Scots pine stands studied earlier. Anthesis in spruce in northern Finland occurred at a later date than in the south. The heat sums needed for anthesis varied latitudinally less in spruce than in pine. The variation of pollen catches in spruce increased towards north-west as in the case of Scots pine. In the unprocessed data, calendar days were found to be the most accurate forecast of anthesis in Norway spruce both for a single year and for the majority of cases of stand averages over several years. Locally, the period unit could be a more accurate parameter for the stand average. However, on a calendar day basis, when annual deviations between expected and measured heat sums were converted to days, period units were narrowly superior to days. The geographical correlations respect to timing of flowering, calculated against distances measured along simulated post-glacial migration routes, were stronger than purely latitudinal correlations. Effects of the reinvasion of Norway spruce into Finland are thus still visible in spruce populations just as they were in Scots pine populations. The proportion of the average annual heat sum needed for spruce anthesis grew rapidly north of a latitude of ca. 63° and the heat sum needed for anthesis decreased only slighty towards the timberline. In light of flowering phenology, it seems probable that the northwesterly third of Finnish Norway spruce populations are incompletely adapted to the prevailing cold climate. A moderate warming of the climate would therefore be beneficial for Norway spruce. This accords roughly with the adaptive situation in Scots pine. fi
dc.language.iso en fi
dc.publisher The Society of Forestry in Finland - The Finnish Forest Research Institute fi
dc.subject kuusi fi
dc.subject Picea abies fi
dc.subject kukinta fi
dc.subject lämpösumma fi
dc.subject ilmastoon sopeutuminen fi
dc.subject siitepöly fi
dc.subject sopeutuminen fi
dc.subject ilmastonmuutokset fi
dc.subject ilmasto fi
dc.subject anthesis, flowering phenology, pollen recording, heat sum, adaptation, reinvasion, Picea abies fi
dc.title Climatic adaptation of Norway spruce (Picea abies (L.) Karsten) in Finland based on male flowering phenology. fi
dc.title.alternative Kuusen sopeutuminen Suomen ilmastoon hedekukkimisaikojen perusteella arvioituna. fi
dc.type Artikkeli fi
dc.identifier.laitoskoodi SMS fi
dc.subject.ysa Suomi fi

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