Jón Guðmundsson | Agricultural University of Iceland (original) (raw)

Researcher on land use and greenhouse gas emisons interaction

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Papers by Jón Guðmundsson

Research paper thumbnail of Near infrared reflectance spectroscopy for quantification of crop residue, green manure and catch crop C and N fractions governing decomposition dynamics in …

J. Near Infrared …, 2004

... Bo Stenberg,a,* Lars S. Jensen,b Erik Nordkvist,c Tor Arvid Breland,d Anders Pedersen,b Jón G... more ... Bo Stenberg,a,* Lars S. Jensen,b Erik Nordkvist,c Tor Arvid Breland,d Anders Pedersen,b Jón Guðmundsson,e Sander Bruun,b Tapio Salo,f Fridrik Palmason,e Trond M. Henrikseng and Audun Korsaethg aSwedish University of Agricultural Sciences, Department of Soil Science ...

Research paper thumbnail of Landbúnaður og losun gróðurhúsalofttegunda

Research paper thumbnail of Icelandic Inland Wetlands: Characteristics and Extent of Draining

Research paper thumbnail of Land-use and greenhouse gas balances of peatlands in the Nordic countries - present knowledge and gaps

Biogeosciences Discussions, 2009

Research paper thumbnail of Áætluð losun gróðurhúslofttegunda við sinubrunann á Mýrum

Research paper thumbnail of Mælingar á rúmþyngd grýtts jarðvegs

Research paper thumbnail of Stepwise chemical digestion, near-infrared spectroscopy or total N measurement to take account of decomposability of plant C and N in a mechanistic model

Soil Biology and Biochemistry, Dec 1, 2007

Mechanistic, multi-compartment decomposition models require that carbon (C) and nitrogen (N) in p... more Mechanistic, multi-compartment decomposition models require that carbon (C) and nitrogen (N) in plant material be distributed among pools of different degradability. For this purpose, measured concentrations of C and N in fractions obtained through stepwise chemical digestion ...

Research paper thumbnail of Application of the water and heat model to forested sites

Research paper thumbnail of The Icelandic Geographic Land Use Database (IGLUD)

Research paper thumbnail of Soil Carbon Sequestration – for climate, food security and ecosystem services

Research paper thumbnail of Er vatn takmarkandi þáttur í landgræðslu ?

Maeldur lofthiti (Hjarðarholt 1991) og reiknað hitastig nokkurra dýptarbila í jarðvegi landgraeðs... more Maeldur lofthiti (Hjarðarholt 1991) og reiknað hitastig nokkurra dýptarbila í jarðvegi landgraeðslusvaeðis við Hornafjarðarfljót. Maeldur lofthiti (Hjarðarholt 1991) Reiknað hitastig í y firborði jarðv egs Reiknað hitastig jarðv eg á 0-2 cm dýpi Reiknað hitastig jarðv egs á 2-5 cm dýpi Reiknað hitastig jarðv egsá 5-10 cm dýpi Reiknað hitastig jarðv egs á 10-15 cm dýpi Bakgrunnur Frá landnámi hefur jarðvegseyðing og uppblástur leitt til þess að vistkerfum stórra svaeða á Íslandi hefur hnignað verulega. Á síðast liðinni öld og einkum seinni hluta hennar hefur Landgraeðsla ríkisins, baendur og ýmis félagasamtök unnið öflugt starf við að endurheimta þessi töpuðu gróðurlendi svo víða eru nú algróin svaeði þar sem áður var auðnin ein. Á öðrum svaeðum hafa sáningar og áburðargjöf, sem eru helstu aðgerðir sem beitt hefur verið, ekki skilað eins góðum árangri. Hér er kannað hvort lítil vatnsheldni jarðvegs þessara svaeða geti verið skýring á hve gróður á erfitt með að komast af stað. Á árunu...

Research paper thumbnail of National Inventory Report Iceland 2008 Submitted under the United Nations Framework Convention on Climate Change

Research paper thumbnail of Áhrif niðurbrots plöntuleifa á laust nítur í jarðvegi.- The influence of turnover of plant residues on mineral N in soil

Research paper thumbnail of Enhanced incentives for mitigation efforts in the Land Use

Research paper thumbnail of Vatnsheldni mismunandi jarðvegsflokka

Research paper thumbnail of Stepwise chemical digestion, near-infrared spectroscopy or total N measurement to take account of decomposability of plant C and N

Soil Biology & Biochemistry, 2007

Mechanistic, multi-compartment decomposition models require that carbon (C) and nitrogen (N) in p... more Mechanistic, multi-compartment decomposition models require that carbon (C) and nitrogen (N) in plant material be distributed among pools of different degradability. For this purpose, measured concentrations of C and N in fractions obtained through stepwise chemical digestion ...

Research paper thumbnail of Empirical predictions of plant material C and N mineralization patterns from near infrared spectroscopy, stepwise chemical digestion and C/N ratios

Soil Biology and Biochemistry, 2005

Prediction of carbon (C) and nitrogen (N) mineralization patterns of plant litter is desirable fo... more Prediction of carbon (C) and nitrogen (N) mineralization patterns of plant litter is desirable for both agronomic and environmental reasons. Near infrared reflectance (NIR) spectroscopy has recently been introduced in decomposition studies to characterize biochemical ...

Research paper thumbnail of Respiration as the main determinant of carbon balance in European forests

Research paper thumbnail of Near infrared reflectance spectroscopy for quantification of crop residue, green manure and catch crop C and N fractions governing decomposition dynamics in soil

Journal of Near Infrared Spectroscopy, 2004

Research paper thumbnail of Variable sensitivity of plant communities in Iceland to experimental warming

Global Change Biology, 2005

Research paper thumbnail of Near infrared reflectance spectroscopy for quantification of crop residue, green manure and catch crop C and N fractions governing decomposition dynamics in …

J. Near Infrared …, 2004

... Bo Stenberg,a,* Lars S. Jensen,b Erik Nordkvist,c Tor Arvid Breland,d Anders Pedersen,b Jón G... more ... Bo Stenberg,a,* Lars S. Jensen,b Erik Nordkvist,c Tor Arvid Breland,d Anders Pedersen,b Jón Guðmundsson,e Sander Bruun,b Tapio Salo,f Fridrik Palmason,e Trond M. Henrikseng and Audun Korsaethg aSwedish University of Agricultural Sciences, Department of Soil Science ...

Research paper thumbnail of Landbúnaður og losun gróðurhúsalofttegunda

Research paper thumbnail of Icelandic Inland Wetlands: Characteristics and Extent of Draining

Research paper thumbnail of Land-use and greenhouse gas balances of peatlands in the Nordic countries - present knowledge and gaps

Biogeosciences Discussions, 2009

Research paper thumbnail of Áætluð losun gróðurhúslofttegunda við sinubrunann á Mýrum

Research paper thumbnail of Mælingar á rúmþyngd grýtts jarðvegs

Research paper thumbnail of Stepwise chemical digestion, near-infrared spectroscopy or total N measurement to take account of decomposability of plant C and N in a mechanistic model

Soil Biology and Biochemistry, Dec 1, 2007

Mechanistic, multi-compartment decomposition models require that carbon (C) and nitrogen (N) in p... more Mechanistic, multi-compartment decomposition models require that carbon (C) and nitrogen (N) in plant material be distributed among pools of different degradability. For this purpose, measured concentrations of C and N in fractions obtained through stepwise chemical digestion ...

Research paper thumbnail of Application of the water and heat model to forested sites

Research paper thumbnail of The Icelandic Geographic Land Use Database (IGLUD)

Research paper thumbnail of Soil Carbon Sequestration – for climate, food security and ecosystem services

Research paper thumbnail of Er vatn takmarkandi þáttur í landgræðslu ?

Maeldur lofthiti (Hjarðarholt 1991) og reiknað hitastig nokkurra dýptarbila í jarðvegi landgraeðs... more Maeldur lofthiti (Hjarðarholt 1991) og reiknað hitastig nokkurra dýptarbila í jarðvegi landgraeðslusvaeðis við Hornafjarðarfljót. Maeldur lofthiti (Hjarðarholt 1991) Reiknað hitastig í y firborði jarðv egs Reiknað hitastig jarðv eg á 0-2 cm dýpi Reiknað hitastig jarðv egs á 2-5 cm dýpi Reiknað hitastig jarðv egsá 5-10 cm dýpi Reiknað hitastig jarðv egs á 10-15 cm dýpi Bakgrunnur Frá landnámi hefur jarðvegseyðing og uppblástur leitt til þess að vistkerfum stórra svaeða á Íslandi hefur hnignað verulega. Á síðast liðinni öld og einkum seinni hluta hennar hefur Landgraeðsla ríkisins, baendur og ýmis félagasamtök unnið öflugt starf við að endurheimta þessi töpuðu gróðurlendi svo víða eru nú algróin svaeði þar sem áður var auðnin ein. Á öðrum svaeðum hafa sáningar og áburðargjöf, sem eru helstu aðgerðir sem beitt hefur verið, ekki skilað eins góðum árangri. Hér er kannað hvort lítil vatnsheldni jarðvegs þessara svaeða geti verið skýring á hve gróður á erfitt með að komast af stað. Á árunu...

Research paper thumbnail of National Inventory Report Iceland 2008 Submitted under the United Nations Framework Convention on Climate Change

Research paper thumbnail of Áhrif niðurbrots plöntuleifa á laust nítur í jarðvegi.- The influence of turnover of plant residues on mineral N in soil

Research paper thumbnail of Enhanced incentives for mitigation efforts in the Land Use

Research paper thumbnail of Vatnsheldni mismunandi jarðvegsflokka

Research paper thumbnail of Stepwise chemical digestion, near-infrared spectroscopy or total N measurement to take account of decomposability of plant C and N

Soil Biology & Biochemistry, 2007

Mechanistic, multi-compartment decomposition models require that carbon (C) and nitrogen (N) in p... more Mechanistic, multi-compartment decomposition models require that carbon (C) and nitrogen (N) in plant material be distributed among pools of different degradability. For this purpose, measured concentrations of C and N in fractions obtained through stepwise chemical digestion ...

Research paper thumbnail of Empirical predictions of plant material C and N mineralization patterns from near infrared spectroscopy, stepwise chemical digestion and C/N ratios

Soil Biology and Biochemistry, 2005

Prediction of carbon (C) and nitrogen (N) mineralization patterns of plant litter is desirable fo... more Prediction of carbon (C) and nitrogen (N) mineralization patterns of plant litter is desirable for both agronomic and environmental reasons. Near infrared reflectance (NIR) spectroscopy has recently been introduced in decomposition studies to characterize biochemical ...

Research paper thumbnail of Respiration as the main determinant of carbon balance in European forests

Research paper thumbnail of Near infrared reflectance spectroscopy for quantification of crop residue, green manure and catch crop C and N fractions governing decomposition dynamics in soil

Journal of Near Infrared Spectroscopy, 2004

Research paper thumbnail of Variable sensitivity of plant communities in Iceland to experimental warming

Global Change Biology, 2005

Research paper thumbnail of  Emissions of greenhouse gases in Iceland from 1990 to 2011 National Inventory Report 2013 Submitted under the United Nations Framework Convention on Climate Change and the Kyoto Protocol Birna Sigrún Hallsdóttir, Christoph Wöll, Jón Guðmundsson, Arnór Snorrason, Jóhann Þórsson

Research paper thumbnail of  Emissions of greenhouse gases in Iceland from 1990 to 2012 Natonal Inventory Report 2014. Submitted under the United Nations Framework Convention on Climate Change and the Kyoto Protocol

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