Search Results - "Christiansen, Jesper Riis"

Spatial variation of net methane uptake in Arctic and subarctic drylands of Canada and Greenland by Juncher Jørgensen, Christian, Schlaikjær Mariager, Tue, Riis Christiansen, Jesper

“…The importance of uptake of atmospheric methane (CH4) in dry Arctic soils for the total Arctic CH4 budget is unresolved. This is partly due to lack of data on…”
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Comparison of static chambers to measure CH4 emissions from soils by Pihlatie, Mari K., Christiansen, Jesper Riis, Aaltonen, Hermanni, Korhonen, Janne F.J., Nordbo, Annika, Rasilo, Terhi, Benanti, Giuseppe, Giebels, Michael, Helmy, Mohamed, Sheehy, Jatta, Jones, Stephanie, Juszczak, Radoslaw, Klefoth, Roland, Lobo-do-Vale, Raquel, Rosa, Ana Paula, Schreiber, Peter, Serça, Dominique, Vicca, Sara, Wolf, Benjamin, Pumpanen, Jukka

“…► Static chamber method is the most common method to measure methane emissions from soils. ► We quantified errors resulting from chamber size and flux…”
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Soil respiration and rates of soil carbon turnover differ among six common European tree species by Vesterdal, Lars, Elberling, Bo, Christiansen, Jesper Riis, Callesen, Ingeborg, Schmidt, Inger Kappel

“…► We studied soil carbon dynamics in six common European tree species. ► We explored differences in soil respiration and indices of C turnover rate. ► Soil…”
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The natural abundance of ¹⁵N in litter and soil profiles under six temperate tree species: N cycling depends on tree species traits and site fertility by Callesen, Ingeborg, Nilsson, Lars Ola, Schmidt, Inger Kappel, Vesterdal, Lars, Ambus, Per, Christiansen, Jesper Riis, Högberg, Peter, Gundersen, Per

“…Aims We investigated the influence of tree species on the natural ¹⁵N abundance in forest stands under elevated ambient N deposition. Methods We analysed δ¹⁵N…”
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First observation of direct methane emission to the atmosphere from the subglacial domain of the Greenland Ice Sheet by Christiansen, Jesper Riis, Jørgensen, Christian Juncher

“…During a 2016 field expedition to the West Greenland Ice Sheet, a striking observation of significantly elevated CH 4 concentrations of up to 15 times the…”
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Nitrous oxide and methane exchange in two small temperate forest catchments—effects of hydrological gradients and implications for global warming potentials of forest soils by Christiansen, Jesper Riis, Vesterdal, Lars, Gundersen, Per

“…The magnitude of greenhouse gas (GHG) flux rates may be important in wet and intermediate wet forest soils, but published estimates are scarce. We studied the…”
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Methane emissions from subglacial meltwater of three alpine glaciers in Yukon, Canada by Sapper, Sarah Elise, Jørgensen, Christian Juncher, Schroll, Moritz, Keppler, Frank, Christiansen, Jesper Riis

“…Subglacial meltwater of land-terminating glaciers in Greenland and Iceland are sources of methane (CH4) to the atmosphere, but sparse empirical data exist…”
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Influence of hydromorphic soil conditions on greenhouse gas emissions and soil carbon stocks in a Danish temperate forest by Christiansen, Jesper Riis, Gundersen, Per, Frederiksen, Preben, Vesterdal, Lars

“…► Emission of N2O was similar in upland and hydromorphic soils in a Danish forest. ► Methane oxidation in the soil was significantly lower in hydromorphic…”
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Assessing the effects of chamber placement, manual sampling and headspace mixing on CH4 fluxes in a laboratory experiment by Christiansen, Jesper Riis, Korhonen, Janne F. J., Juszczak, Radoslaw, Giebels, Michael, Pihlatie, Mari

“…A laboratory experiment was conducted with two types of closed static chambers to estimate the effects of chamber placement, manual headspace sampling and…”
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Continuous methane concentration measurements at the Greenland ice sheet–atmosphere interface using a low-cost, low-power metal oxide sensor system by Jørgensen, Christian Juncher, Mønster, Jacob, Fuglsang, Karsten, Christiansen, Jesper Riis

“…In this paper, the performance of a low-cost and low-power methane (CH4) sensing system prototype based on a metal oxide sensor (MOS) sensitive to CH4 is…”
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Methane fluxes and the functional groups of methanotrophs and methanogens in a young Arctic landscape on Disko Island, West Greenland by Christiansen, Jesper Riis, Romero, Alejandro Jose Barrera, Jørgensen, Niels O. G, Glaring, Mikkel Andreas, Jørgensen, Christian Juncher, Berg, Louise Kristine, Elberling, Bo

“…Arctic soils are known to be important methane (CH₄) consumers and sources. This study integrates in situ fluxes of CH₄between upland and wetland soils with…”
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Climate mitigation potential and soil microbial response of cyanobacteria‐fertilized bioenergy crops in a cool semi‐arid cropland by Gay, Justin D., Goemann, Hannah M., Currey, Bryce, Stoy, Paul C., Christiansen, Jesper Riis, Miller, Perry R., Poulter, Benjamin, Peyton, Brent M., Brookshire, E. N. Jack

“…Bioenergy carbon capture and storage (BECCS) systems can serve as decarbonization pathways for climate mitigation. Perennial grasses are a promising…”
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Do indicators of nitrogen retention and leaching differ between coniferous and broadleaved forests in Denmark? by Gundersen, Per, Sevel, Lisbeth, Christiansen, Jesper Riis, Vesterdal, Lars, Hansen, Karin, Bastrup-Birk, Annemarie

“…The area of broadleaved forests is projected to increase in Denmark as well as in the rest of Europe. However, studies of the N leaching response to elevated N…”
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Spatial controls of methane uptake in upland soils across climatic and geological regions in Greenland by D’Imperio, Ludovica, Li, Bing-Bing, Tiedje, James M., Oh, Youmi, Christiansen, Jesper Riis, Kepfer-Rojas, Sebastian, Westergaard-Nielsen, Andreas, Brandt, Kristian Koefoed, Holm, Peter E., Wang, Peiyan, Ambus, Per, Elberling, Bo

“…Abstract In the Arctic, the spatiotemporal variation of net methane uptake in upland soils depends on unresolved interactive controls between edaphic and…”
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Soil-atmosphere exchange of N₂O, CO₂ and CH₄ along a slope of an evergreen broad-leaved forest in southern China by Fang, Yunting, Gundersen, Per, Zhang, Wei, Zhou, Guoyi, Christiansen, Jesper Riis, Mo, Jiangming, Dong, Shaofeng, Zhang, Tao

“…At most sites the magnitude of soil-atmosphere exchange of nitrous dioxide (N₂O), carbon dioxide (CO₂) and methane (CH₄) was estimated based on a few chambers…”
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To replicate, or not to replicate – that is the question: how to tackle nonlinear responses in ecological experiments by Kreyling, Juergen, Schweiger, Andreas H., Bahn, Michael, Ineson, Phil, Migliavacca, Mirco, Morel‐Journel, Thibaut, Christiansen, Jesper Riis, Schtickzelle, Nicolas, Larsen, Klaus Steenberg, Chase, Jonathan

“…A fundamental challenge in experimental ecology is to capture nonlinearities of ecological responses to interacting environmental drivers. Here, we demonstrate…”
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Forest canopy water fluxes can be estimated using canopy structure metrics derived from airborne light detection and ranging (LiDAR) by Schumacher, Johannes, Christiansen, Jesper Riis

“…•We estimate precipitation canopy throughfall with LiDAR data and meteorological variables.•We estimate throughfall on monthly, seasonal, and annual…”
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Comparison of CO2, CH4 and N2O soil-atmosphere exchange measured in static chambers with cavity ring-down spectroscopy and gas chromatography by Christiansen, Jesper Riis, Outhwaite, Josh, Smukler, Sean M.

“…•CRDS fluxes differed significantly compared to GC for CO2 and CH4, but not N2O.•CH4 uptake was detected with CRDS in the field experiment, but not with…”
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Reduction of forest soil biota impacts tree performance but not greenhouse gas fluxes by Georgopoulos, Konstantinos, Bezemer, T Martijn, Christiansen, Jesper Riis, Larsen, Klaus Steenberg, Moerman, Gina, Vermeulen, Roos, Anslan, Sten, Tedersoo, Leho, Gomes, Sofia IF

“…Soil communities are essential to ecosystem functioning, yet the impact of reducing soil biota on root-associated communities, tree performance, and greenhouse…”
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A strong temperature dependence of soil nitric oxide emission from a temperate forest in Northeast China by Huang, Kai, Su, Chenxia, Liu, Dongwei, Duan, Yihang, Kang, Ronghua, Yu, Haoming, Liu, Yuqi, Li, Xue, Gurmesa, Geshere Abdisa, Quan, Zhi, Christiansen, Jesper Riis, Zhu, Weixing, Fang, Yunting

“…•First long-term daily soil NO flux measurement with an automated system from a temperate forest in Northeast China.•Soil temperature explained 90–92% of the…”
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