Náttúrufræðingurinn

Volume

Náttúrufræðingurinn - 1964, Page 162

Náttúrufræðingurinn - 1964, Page 162
254 N ATT U RUFRÆÐINGURINN NATTÚRU FRÆÐl N GURIN N 255 TAFLA V. Lynggróður með Rhacomitrium (frh.). Die Rhacomitriumreiche Ziuergstrauchheide. 1 2 3 4 5 6 7 8 1 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Fjallagrös (Cetraria islandica) 60 100 30 80 10 20 \ioo 100 60 60 80 70 90 90 60 — (Cetraria islandica v. platyna) | 60 80 90 70 20 Cladonia ecmocyna 10 20 10 10 30 80 100 70 10 20 50 70 20 Cladonia furcata 10 10 50 20 10 20 40 10 Cladonia gracilis v. cordalis 20 10 20 50 20 10 10 Cladonia lepidota 10 10 20 70 20 40 20 30 10 Hreindýramosi (Cladonia ?nilis) 30 70 50 60 90 80 80 100 100 80 90 30 10 60 10 — (Cladonia rangiferina) 10 20 20 40 40 70 60 10 20 60 10 — (Cladonia silvatica) 10 10 10 Cladonia uncialis 10 1 10 70 30 40 Cladonia verticillata 10 Cornicularia aculeata 20 10 Peltigera aphthosa 10 Peltigera canina 20 60 20 100 40 20 Peltigera leucophlebia 20 Peltigera rufescens 10 10 70 Stereocaulon alpinum 40 10 10 60 40 70 20 40 30 20 90 Stereocaulon denundatum 10 20 20 Thamolia vermicularis 10 Tegundafjöldi æðri plantna 16 18 22 18 23 21 22 21 21 13 21 19 18 18 14 19 16 15 18 21 23 21 17 Einingafjöldi æðri plantna (pointtala) 680 840 1230 830 1170 1110 1060 980 1000 710 1040 1110 890 1050 740 760 860 820 1170 1260 1270 1220 870 Tíðni æðri plantna 6.8 8.4 12.3 8.3 11.7 11.1 10.6 9.8 10.0 7.1 10.4 11.1 8.9 10.5 7.4 7.6 8.6 8.2 11.7 12.6 12.7 12.2 8.7 Tegundafjöldi lægri plantna 4 6 16 9 7 8 16 19 26 16 21 21 20 15 4 11 14 15 20 12 17 4 14 Sýrustig jarðvegs (pH) 5.9 5.6 5.6 5.5 5.9 5.9 5.6 5.3 5.8 5.5 5.7 5.6 5.6 4.6 5.8 6.0 5.6 5.7 5.4 5.3 5.1 5.6 5.4 Lífræn efni (% af þurrefni) 23.55 26.74 29.61 25.73 21.40 22.53 30.84 35.31 17.98 32.53 32.01 24.80 30.88 26.29 28.70 21.55 26.37 22.30 35.50 43.99 31.72 26.92 26.57 Vatnsmagn (% af þurrefni) 98.4 87.0 118.2 76.7 79.1 90.6 101.4 91.0 108.8 Þykkt gróðunnoldar (cm) 1 10 9 4 9 7 5 13 6.5 9 7 6 6 8 5 3 7 6 5 10 8 9 10 Hæð yfir sjávarmál (m) 200 300 300 350 250 250 300 300 350 450 300 350 350 350 200 200 450 400 450 450 450 350 350 Hallastefna*) A N NV N N F SA SA V SA SA V F NV NV NV S S *) F = Flötur. Meyjarsæti: 1; 15; 16 Þingvallahraun I: 2; 3; 7; 8; 11 Þingvallahraun II: 4; 9; 12; 13; 14; 22; 23 Goðaskarð: 5; 6 lireiði: 16 17; 19; 20; 21 Sandgígur: 18
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