Íslenskar landbúnaðarrannsóknir - 01.03.1980, Page 52

Íslenskar landbúnaðarrannsóknir - 01.03.1980, Page 52
50 ÍSLENZKAR LANDBÚNAÐARRANNSÓKNIR 11. TAFLA. Beitargildi gróðurhverfa í Þjórsárdal 1977. TABLE 11. The grazing value of plant communities in Thjórsárdalur 1977. 12. TAFLA. Beitargildi gróðurhverfa í Þjórsárdal. (FE — Fóðureiningar). Specific grazing value of plant communities in Tjórsárdal- ur. < 200 m h.y.s. > 200 m h.y.s. Fjöldi Fjöldi nýtanlegra nýtanlegra fóðureininga fóðureininga Gróðurhverfi Available Available Plant communities feed units feed units Ai .................... 150 73 As ...................... 7 216 A4 ..................... 41 1912 A? .................... 116 2492 As .................... 619 5650 C4 ................... 7154 9408 Da .................... 156 73 Ds ................... 2400 Ei ................... 1862 E2 ................... 2462 1642 G2 .................... 616 7178 Hi ................... 8459 Ha ................... 2596 7458 H4 ................... 1870 Ki .................. 13658 6602 K2 ................. 32,775 18810 K4 ................................. 8096 Li .................... 383 n ..................... 259 6867 s .................... 4628 28514 R ................... 43274 1824 T2 .................... 726 6568 Ts ................................ 11300 Ö2 .................................. 220 U4 ................................. 1535 V3 .................................. 170 Samtals ............ 124211 126808 Total Lélegar beitarplöntur hverfa, en hinar betri verða ríkjandi, og uppskera gróður- hverfanna vex eftir því, sem friðunin er lengri. Árið 1960 gefur hver hektari algróins lands á dalbotninum af sér að meðaltali Nýtanlegar fóðureiningar Gróðurhverfi á hektara Plant communities Available feed unils per hectare Ai Mosaþemba ............................ 13 Rhacomitrium heath A2 Mosaþemba með stinnastör .......... 34 Rhacomitrium heath with Carex Bigelowii As Mosaþemba með stinnastör og smárunnum ........................ 23 Rhacomitrium heath with Carex Bigelowii and dwarf shrubs A4 Mosaþemba með smárunnum ........... 18 Rhacomitrium heath with dwarf shrubs Ao Mosaþemba með þursaskeggi ......... 18 Rhacomitrium heath with Kobresia myosuroides Ai Mosaþemba með þursaskeggi og smárunnum ............................ 34 Rhacomitrium heath with Kobresia myosuroides and dwarf shrubs A» Mosaþemba með grösum og smárunnum ................................. 43 Rhacomitrium heath with Gramineae and dwarf shrubs C4 Ilmbjörk - grös ........................... 196 Betula pubescerts — Gramineae Di Grávíðir — krækilyng ...................... 33 Salix callicarpea - Empelrum hermafroditum D3 Grávíðir .................................. 52 Salix callicarpea Ds Gulvíðir - grös ...........................250 Salix phylicifolia — Gramineae Ei Þursaskegg ................................ 70 Kobresia myosuroides E2 Þursaskegg — smárunnar .................... 54 Kobresia myosuroides - dwarf shrubs G2 Stinnastör - smárunnar .................... 92 Carex Bigelowii - dwarf shrubs Hi Graslendi .................................228 Grassland H3 Graslendi með smárunnum ...................220 Grassland with shrubs H4 Melgras ...................................220 Elymus arenarius

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