Jökull

Ataaseq assigiiaat ilaat

Jökull - 01.12.1993, Qupperneq 26

Jökull - 01.12.1993, Qupperneq 26
 Species/Genera Sampling site (Fig. 1) Time span No. of trees Intemal correlation Origin Iceland 1 Pinus silvestris C 1748-1973 15 0.673 Yenisey river Iceland 2 Pinus silvestris B and C 1820-1977 5 0.608 White Sea, Arkhangelsk Iceland 3 Pinus silvestris B and C 1777-1948 3 0.613 White Sea, Murmansk Iceland 4 Picea sp. B and C 1811-1982 7 0.567 White Sea, Aikhangelsk Iceland 5 Larix sp. B and C 1-224 Tree rings 7 0.520 East of Ural Greenland 1 Pinus silvestris D 1884-1961 2 0.680 White Sea, Arkhangelsk Greenland 2 Picea sp. D 1850-1930 3 0.503 White Sea, Aikhangelsk Iceland: Strandir (B) Iceland: Langanes (C) Iceland: Reykjanes (A) Iceland total Greenland: Scoresby Sund (D) Pinus 29 (71 %) 171 (68 %) 32 (64 %) 232 (68 %) 9 (36 %) Picea 3(7%) 42 (17 %) 8 (16 %) 53 (15 %) 10 (40 %) Larix 7 (17 %) 33 (13 %) 11 (20 %) 51 (15 %) 4 (16 %) broadleaf trees 2(5%) 5 ( 2%) 0 7(2%) 2(8%) Total 41 251 51 343 25 Table 3. Dated and undated driftwood mean curves from this study. — Samantekt á meðaltölum árhringja í reka- viði frá Islandi og Grœn- landi. Table 4. Distribution of the driftwood taxa collected in Iceland and Greenland. — Tíðni mismunandi viðar- tegunda í reka á Islandi og Grœnlandi. SPECIES DISTRIB UTION AND ORIGIN The distribution of the driftwood taxa from the sampling sites (A,B,C,D) are shown in Table 4 and summarised in the last column. The collections are all dominated by coniferous trees, indicating that they originate from boreal forest regions. If the species distribution is compared with the forest composition of the boreal forests of Russia (including Siberia) where Picea and Pinus dominate the western parts of the forests and Larix the eastern parts (Figure 4), it can be concluded that the Larix driftwood origi- nates from the eastern boreal forests of Russia, while the Pinus and Picea samples originate from western Russia. As illustrated in Table 3 the collection from Greenland (D), although small, indicates that the tree species composition differs from that on Iceland, par- ticularly in the amount of Picea. This might be due to input from the North American rivers (catchment area, Mackenzie, Canada and Yukon, Alaska is dominated by Picea) draining into the Arctic Ocean (Figure 4). Dendrochronological studies on driftwood from Baf- fin Island point in the same direction (Eggertsson and Laeyendecker, submitted). DENDROCHRONOLOGICALINVESTIGATIONS Of the Pinus samples from Langanes (Figure 1 ;C Table 4), 92 could be synchronised as one group, 54% of the total Pinus samples from that locality. They therefore originate from the "same" area. Out of those 15 were used to build a mean tree-ring curve for Pi- 24 JÖKULL, No. 43, 1993
Qupperneq 1
Qupperneq 2
Qupperneq 3
Qupperneq 4
Qupperneq 5
Qupperneq 6
Qupperneq 7
Qupperneq 8
Qupperneq 9
Qupperneq 10
Qupperneq 11
Qupperneq 12
Qupperneq 13
Qupperneq 14
Qupperneq 15
Qupperneq 16
Qupperneq 17
Qupperneq 18
Qupperneq 19
Qupperneq 20
Qupperneq 21
Qupperneq 22
Qupperneq 23
Qupperneq 24
Qupperneq 25
Qupperneq 26
Qupperneq 27
Qupperneq 28
Qupperneq 29
Qupperneq 30
Qupperneq 31
Qupperneq 32
Qupperneq 33
Qupperneq 34
Qupperneq 35
Qupperneq 36
Qupperneq 37
Qupperneq 38
Qupperneq 39
Qupperneq 40
Qupperneq 41
Qupperneq 42
Qupperneq 43
Qupperneq 44
Qupperneq 45
Qupperneq 46
Qupperneq 47
Qupperneq 48
Qupperneq 49
Qupperneq 50
Qupperneq 51
Qupperneq 52
Qupperneq 53
Qupperneq 54
Qupperneq 55
Qupperneq 56
Qupperneq 57
Qupperneq 58
Qupperneq 59
Qupperneq 60
Qupperneq 61
Qupperneq 62
Qupperneq 63
Qupperneq 64
Qupperneq 65
Qupperneq 66
Qupperneq 67
Qupperneq 68
Qupperneq 69
Qupperneq 70
Qupperneq 71
Qupperneq 72
Qupperneq 73
Qupperneq 74
Qupperneq 75
Qupperneq 76
Qupperneq 77
Qupperneq 78
Qupperneq 79
Qupperneq 80
Qupperneq 81
Qupperneq 82
Qupperneq 83
Qupperneq 84
Qupperneq 85
Qupperneq 86
Qupperneq 87
Qupperneq 88
Qupperneq 89
Qupperneq 90
Qupperneq 91
Qupperneq 92

x

Jökull

Direct Links

Hvis du vil linke til denne avis/magasin, skal du bruge disse links:

Link til denne avis/magasin: Jökull
https://timarit.is/publication/1155

Link til dette eksemplar: 1. tölublað (01.12.1993)
https://timarit.is/issue/387311

Link til denne side:

Link til denne artikel:

Venligst ikke link direkte til billeder eller PDfs på Timarit.is, da sådanne webadresser kan ændres uden advarsel. Brug venligst de angivne webadresser for at linke til sitet.

1. tölublað (01.12.1993)

Iliuutsit: