{"id":6479,"date":"2026-10-19T09:48:57","date_gmt":"2026-10-19T09:48:57","guid":{"rendered":"https:\/\/phd.hi.is\/doktorsvorn\/doktorsvorn-i-jardvisindum-christian-klopsch\/"},"modified":"2026-10-19T09:48:57","modified_gmt":"2026-10-19T09:48:57","slug":"doktorsvorn-i-jardvisindum-christian-klopsch","status":"publish","type":"phd_defence","link":"https:\/\/phd.hi.is\/en\/doktorsvorn\/doktorsvorn-i-jardvisindum-christian-klopsch\/","title":{"rendered":"Doktorsv\u00f6rn \u00ed Jar\u00f0v\u00edsindum – Christian Klopsch"},"content":{"rendered":"
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Streymi \u00e1 Zoom:
<\/strong>https:\/\/eu01web.zoom.us\/j\/62313637370<\/a><\/p>\n

Doktorsefni:
<\/strong>Christian Klopsch<\/p>\n

Heiti ritger\u00f0ar:
<\/strong>\u00c1hrif langt\u00edmast\u00f6\u00f0vunar beitar \u00e1 kolefnismyndun \u00ed \u00edslensku gras- og lynglendi<\/p>\n

Andm\u00e6lendur<\/strong>:
Dr. Sari Stark, rannsakandi hj\u00e1 Centre, h\u00e1sk\u00f3linn \u00e1 Lapplandi, \u00ed Finnlandi
Dr. Thomas C. Parker, h\u00e1lendisvistfr\u00e6\u00f0ingur hj\u00e1 James Hutton Institute \u00ed Aberdeen, Bretlandi<\/p>\n

Lei\u00f0beinandi:
<\/strong>Dr. Anna Gu\u00f0r\u00fan \u00de\u00f3rhallsd\u00f3ttir, pr\u00f3fessor vi\u00f0 fer\u00f0am\u00e1ladeild H\u00e1sk\u00f3lans \u00e1 H\u00f3lum, \u00cdslandi
dr. \u00c1slaug Geirsd\u00f3ttir, pr\u00f3fessor emerita vi\u00f0 jar\u00f0v\u00edsindadeild H\u00e1sk\u00f3la \u00cdslands<\/p>\n

Einnig \u00ed doktorsnefnd:
<\/strong>Dr. Bj\u00f6rn \u00deorsteinsson pr\u00f3fessor vi\u00f0 Landb\u00fana\u00f0arh\u00e1sk\u00f3li \u00cdslands
Dr. Ren\u00e9 van der Wal pr\u00f3fessor vi\u00f0 SLU, Swedish University of Agricultural Sciences, \u00ed Uppsala, Sv\u00ed\u00fej\u00f3\u00f0
Dr. Richard D. Bardgett, pr\u00f3fessor vi\u00f0 Lancaster University, Bretlandi<\/p>\n

Doktorsv\u00f6rn st\u00fdrir:
<\/strong>Dr. Andri Stef\u00e1nsson, pr\u00f3fessor og deildarforseti Jar\u00f0v\u00edsindadeildar H\u00e1sk\u00f3la \u00cdslands<\/p>\n

\u00c1grip:
<\/strong>Ranns\u00f3knir og \u00e1hugi \u00e1 \u00e1hrifum og mikilv\u00e6gi st\u00f3rra grasb\u00edta \u00ed kolefnishringr\u00e1s vistkerfa hefur aukist verulega \u00e1 undanf\u00f6rnum \u00e1rum, \u00fe\u00f3 beinar ranns\u00f3knir \u00e1 \u00e1hrifum langt\u00edmabeitar hafi skort, einkum \u00e1 nor\u00f0l\u00e6gum sl\u00f3\u00f0um. \u00c1 \u00cdslandi hefur \u00fathagabeit lengi veri\u00f0 umdeild og \u00e1hersla l\u00f6g\u00f0 \u00e1 a\u00f0 fri\u00f0a land, \u00fer\u00e1tt fyrir a\u00f0 ranns\u00f3knir \u00e1 \u00e1hrifum beitarfri\u00f0unar hafi veri\u00f0 takmarka\u00f0ar. Markmi\u00f0 \u00feessarar ranns\u00f3knar var a\u00f0 sko\u00f0a \u00e1hrif langt\u00edma beitarfri\u00f0unar \u00e1 kolefnisb\u00faskap \u00edslensks l\u00e1glendis\u00fathaga. Kolefnishringr\u00e1s langt\u00edma beitarfri\u00f0unar (20-83 \u00e1r) var ranns\u00f6ku\u00f0 og borin saman vi\u00f0 kolefnishringr\u00e1s samliggjandi beitarsv\u00e6\u00f0a \u00e1 34 v\u00f6ldum sv\u00e6\u00f0um v\u00ed\u00f0s vegar um landi\u00f0. Ger\u00f0ar voru meira en 2400 m\u00e6lingar \u00e1 CO2-fl\u00e6\u00f0i og bla\u00f0gr\u00e6nu (NDVI). Kolefnisferli \u00ed jar\u00f0veginum var rannsaka\u00f0 \u00fat fr\u00e1 magni jar\u00f0vegskolefnis (SOC), k\u00f6fnunarefni, r\u00f3tarmagni og r\u00f3tareiginleikum \u00ed 201 jar\u00f0vegssni\u00f0i (0-60 cm). Ni\u00f0urst\u00f6\u00f0urnar s\u00fdna a\u00f0 beitarfri\u00f0un leiddi til minni (-37%) kolefnisuppt\u00f6ku yfir vaxtart\u00edmann og var munurinn meiri \u00ed graslendi en m\u00f3lendi. Magn jar\u00f0vegskolefnis var einnig minna (-8%) auk \u00feess sem magn f\u00ednna r\u00f3ta, sem m\u00e6likvar\u00f0i \u00e1 upps\u00f6fnun jar\u00f0vegskolefnis, var 21% minna \u00e1 me\u00f0an r\u00f3tabygging h\u00e9lst svipu\u00f0 \u00ed beittum og fri\u00f0u\u00f0um sv\u00e6\u00f0um. Beitarfri\u00f0un haf\u00f0i almennt meiri \u00e1hrif \u00ed graslendi en m\u00f3lendi og s\u00e9rstaklega \u00fear sem langt\u00edma beitarfri\u00f0un leiddi til gr\u00f3\u00f0urbreytinga, fr\u00e1 graslendi til m\u00f3lendis. \u00deegar \u00e1 heildina er liti\u00f0 s\u00fdna \u00feessar ni\u00f0urst\u00f6\u00f0ur a\u00f0 beit \u00f6rvar kolefnisuppt\u00f6ku og eykur kolefnisbindingu \u00ed jar\u00f0vegi graslendis og m\u00f3lendis \u00ed \u00edslenskum l\u00e1glendis\u00fathaga.<\/p>\n

Um doktorsefni\u00f0:
<\/strong>Christian f\u00e6ddist og \u00f3lst upp \u00ed dreifb\u00fdli \u00ed \u00de\u00fdskalandi. Hann lauk BA-pr\u00f3fi \u00ed landfr\u00e6\u00f0i \u00e1ri\u00f0 2018 fr\u00e1 Martin-Luther-h\u00e1sk\u00f3lanum \u00ed Halle-Wittenberg \u00ed \u00de\u00fdskalandi. \u00cd grunnn\u00e1mi s\u00ednu f\u00f3r hann sem Erasmus nemandi til Noregs \u00cd eitt \u00e1r \u00fear sem \u00e1hugi hans \u00e1 nor\u00f0l\u00e6gum vistkerfum og loftslagsbreytingum efldist. Hann lauk meistarapr\u00f3fi \u00ed stj\u00f3rnun loftslagsm\u00e1la \u00e1ri\u00f0 2020 fr\u00e1 Western Norway University of Applied Sciences, \u00fear sem hann rannsaka\u00f0i landn\u00e1m hryggleysingja \u00ed vistkerfum sem myndast hafa eftir hop j\u00f6kla, auk ranns\u00f3kna \u00e1 vistkerfum \u00ed j\u00f6kulumhverfi \u00e1 Svalbar\u00f0a. Samhli\u00f0a n\u00e1mi s\u00ednu \u00e1 \u00e1runum 2018-2021 starfa\u00f0i hann og bj\u00f3 \u00e1 sau\u00f0fj\u00e1rb\u00fai \u00ed fjalllendi Noregs. S\u00fa reynsla vakti \u00e1huga hans \u00e1 \u00e1hrifum d\u00fdra \u00e1 loftslag og l\u00edfefnafr\u00e6\u00f0ilegum hringr\u00e1sum. \u00cd framhaldi af \u00fev\u00ed h\u00f3f hann doktorsn\u00e1m vi\u00f0 H\u00e1sk\u00f3la \u00cdslands og H\u00e1sk\u00f3lann \u00e1 H\u00f3lum \u00fear sem hann hefur veri\u00f0 a\u00f0 rannsaka \u00e1hrif beitar \u00e1 kolefnishringr\u00e1s \u00ed l\u00e1glendisvistkerfum \u00e1 \u00cdslandi. Auk doktorsn\u00e1ms s\u00edns a\u00f0sto\u00f0a\u00f0i hann vi\u00f0 kennslu \u00ed grasafr\u00e6\u00f0i og vistfr\u00e6\u00f0i gr\u00f3\u00f0urlenda vi\u00f0 Landb\u00fana\u00f0arh\u00e1sk\u00f3la \u00cdslands og lag\u00f0i sitt af m\u00f6rkum til kortlagningar \u00e1 l\u00edffr\u00e6\u00f0ilegri fj\u00f6lbreytni graslendis \u00ed Evr\u00f3pu. Me\u00f0 b\u00fasetu \u00e1 H\u00f3lum gat Christian samr\u00e6mt fr\u00e6\u00f0ast\u00f6rf s\u00edn og a\u00f0d\u00e1un sinni \u00e1 snj\u00f3\u00feungum vetrum og g\u00f6ngusk\u00ed\u00f0um.<\/p>\n

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