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            <gco:CharacterString>Gerðar voru landfræðilegar greiningar á hitafarsskilyrðum til vaxtar valdra trjátegunda á Íslandi. Annars vegar var Þetta gert fyrir birki sem er eina náttúrulega trjátegundin á Íslandi sem vex sem skógur og hins vegar fyrir rauðgreni sem er góður samnefnari fyrir vöxt ýmissa annarra trjátegunda þar sem það þarf nokkuð góð skilyrði til vaxtar. Hitafarslíkan frá Veðurstofu Íslands var notað við greiningarnar fyrir árin 1961-2006. Reiknuð voru vikmörk meðalhita sumars (júní, júlí og ágúst) fyrir báðar tegundir. Þröskuldsgildi fyrir birki var 7,6°C og rauðgreni 9,7°C. Vikmörkin gáfu til kynna stöðugleika í hitastigi fyrir hverja myndeiningu og því var hægt að segja fyrir um bestu skilyrði til trjávaxtar fyrir hvora tegund. Einungis var miðað við hitastig í birkigreiningunni, en fyrir rauðgrenið var einnig tekið mið af seltu og vindálagi.

Rastalíkanið er í 900x900 m myndeiningum og hentar í mælikvarða 1:500.000 – 1:1.000.000</gco:CharacterString>
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                  <gco:CharacterString>Gögnin eru landsþekjandi.

Gögnin eru byggð á hitafarslíkani Veðurstofunnar sem byggir síðan á brúun (interpolation). Brúunin byggir m.a. á meðalhita mánaðar í veðurstöðvaneti yfir allt landið og svo þáttum eins og fjarlægð frá sjó. Þar sem brúað er á milli stöðva geta verið skekkjur þar sem langt er á milli stöðva. Niðurstöður þessa hitafarslíkans eru í samræmi við þau gögn sem notuð eru sem þýðir aftur að hitafarsskilyrði fyrir trjágróður eru þá með sömu fyrirvörum.

Vaxtarskilyrði birkis á Íslandi: Hitalíkan yfir meðalhita mánaðar frá 1961-2006 Veðurstofu Íslands. Hitaþröskuldar fyrir birki (Þorbergur Hjalti Jónsson, Christoph Woll)

Vaxtarskilyrði rauðgrenis á Íslandi: Hitalíkan yfir meðalhita mánaðar frá 1961-2006 Veðurstofu Íslands. Hitaþröskuldar fyrir rauðgreni í Noregi. Seltugögn frá Freysteini Sigurðssyni. Vindálagsgögn frá Haraldi Ólafssyni.

Eigindir eru ekki skráðar á þessa þekju í samræmi við staðla eða fitjuskrár.</gco:CharacterString>
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