Publikasjoner
NIBIOs ansatte publiserer flere hundre vitenskapelige artikler og forskningsrapporter hvert år. Her finner du referanser og lenker til publikasjoner og andre forsknings- og formidlingsaktiviteter. Samlingen oppdateres løpende med både nytt og historisk materiale. For mer informasjon om NIBIOs publikasjoner, besøk NIBIOs bibliotek.
1994
Forfattere
Kåre Olav VennSammendrag
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Forfattere
Tord K. RindalSammendrag
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Sammendrag
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Forfattere
Petter SnilsbergSammendrag
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Forfattere
Tord K. RindalSammendrag
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Forfattere
Arne GrønlundSammendrag
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Forfattere
Jarle BerganSammendrag
The main objective of the investigation was to study survival, height growth and injuries to planting stock material originating from different latitudes in Helgeland, Nord- and Sr-Trndelag when planted in Troms. In the years 1975 to 1978 nine test-fields of Norway spruce were laid out at different localities in Middle-Troms at about 69N (Table 1). According to Kielland-Lund (1981), the vegetation types represented in the investigation are: 13. ass.: Eu-Piceetum abietis a) Subass.: myrtilletosum b) Subass.: dryopteridetosum 14. ass.: Melico nutantis - Piceetum abietis b) Subass.: typicum c) Subass.: aconitetosumThe frost risk is classified from 1 to 3, with 3 as the locality most exposed to severe night frost. The seed was collected in twentytwo districts at different latitudes from the most northern autochthon grown Norway spruce districts at about 6620N in Rana to 6301N in Sr-Trndelag (Table 2). The cones were gathered from ten trees in three stands within each district. In addition, three stands in the lowland at about 5937N in southern Norway is represented at two plots (T.127 and T.131). Plants originated from commercial seed lots collected at larger areas within Rana (No. 23), have been planted at some plots. From Table 2 it will also be seen that a commercial provenance from northern Sweden (No. 24) together with an other provenance from high altitudes in South-East Norway (No. 25) are represented in the plant material. They have been compared with the plants from the other districts at plot T.127. Due to limited quantities of seed, especially from the southern districts, the number of districts and stands differ between plots. 22 districts and 66 stands are investigated at T.127 together with the commercial seed provenances. According to previous reports, the northern districts are the most interesting by afforestation in Troms (Bergan 1978, 1991, 1992). The results from each plot have been dealt with and discussed separately in the report. Except for a few tables, the results from each plot are presented in Figs. 1 to 62. The plots have been scrutinized or inspected in all the years from planting to the last scrutiny in the autumn 1992 or 1993. For each plot the height development and decrease in survival percentage are shown in figures for a selection of representative districts. The mean heights are either calculated on all living plants (Htot) or as a mean of the highest plants (H20) corresponding to 889 trees per hectare. Variance and regression analysis have been executed on the data of heights and survival by the last scrutiny in 1992 or 1993. In addition, analysis have been done on injuries to the plants caused by heavy frost, small rodents or hares. Lammas shoot on the plants has been observed in a few years at some of the plots. The differences in heights, survival and injuries between districts or stands have been best expressed by regression analysis showing the relation between heights, survival or injuries and the latitude of the seed collection sites. The main conclusions of the results are: At most of the plots there is a correlation between mean heights of the plants and the latitude of the stands and districts where the plant seed is collected. The plant height decreases from northern to southern districts. However, at localities with low frost risk, such as T.140, the differences in heights are not significant. Even at these localities, the results do not indicate that southern districts and stands are to be preferred to more northerly. No stands in the various districts have turned out to be significant different from the others. Between the most northern districts Rana, Bardal and Korgen, the differences in heights is very small. The northern commercial provenance (Rana P1-4145) does not deviate significantly from the plants of selected districts and stands at the same latitude. This is the case for the plants of the northern Swedish provenance, too. As regards plant survival, there is only at a couple of plots (T.131 and T.144) that the survival percentage decreases successively from the north to the south. However, at all the plots, the survival of plants from northern districts is equal to other districts with high survival percentage. The most southern lowland provenance (Hurum) has shown low survival percentage at the two plots where it is represented. In years with a high percentage of plants injured by frost, the results at several plots show that the frost damages increase from the north to the south. In years with less frost injuries to the plants, there are no significant differences between plants of districts from different latitudes. The frost injuries usually occur in late summer or early winter/spring. At some of the plots a correlation has been shown between lammas shoot frequency on the plants and the latitude of the origin of the plants. The lammas shoot frequency increases with southerly latitudes. As regards damages by small rodents and hares, a relationship between damages and the latitude of the origin of the seed has only been found at a few plots in a single year. In these cases the damages by small rodents increase from the north to the south, while browsing of top shoots by hares decreases to the south (Fig. 56).Significant differences between provenances and injuries by hares have not been shown in earlier investigations in this part of the country (Bergan 1991, 1992), or at the other plots in this report. A probable cause may be explained by heavy snow depth conditions combined with differences in the plant heights of the various districts when the browsing by hares is most intensive in the winter, and only the highest plants reach above the snow cover. The results presented in this report correspond well to the results of earlier reports dealing with the use of spruce provenances in North-Norway (Bergan 1978, 1991, 1992).
Forfattere
Helge Irgens HøegSammendrag
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Forfattere
Oddvar HaveraaenSammendrag
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Forfattere
Hans Fredrik Hoen Birger SolbergSammendrag
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