Kristian Albert's Publications List

Does warming affect stem secondary growth and biomass production of shrubs in the High Arctic?

2013-06-19T11:43:18Z

The predicted increase in summer temperature might change the plant growth dynamics and biomass production of arctic ecosystems and their feedback to climate change. Nevertheless, up to date, no information is available on the impact of warming on stem secondary growth and aboveground relative growth rate (RGR) of shrubs and whole-community net primary production (NPP) in the High Arctic. Here, we...

CAMPIOLI M, SCHMIDT NM, ALBERT KR, RO-POULSEN H, MATHIESEN KL, MICHELSEN A (2013) Plant Ecology accepted:

Antagonistic effects of drought and warming counteract photosynthetic stimulation of elevated CO2 in temperate heath plants

2013-06-10T17:45:36Z

Climatic change factors in concert are likely to induce unpredictable interactive impacts on plant carbon uptake and water consumption and multi-factor experimentation serves as a tool to gain knowledge into such processes. In the second year of experimentation, we investigated the combined impact of elevated CO2 (CO2) drought (D) and nighttime warming (T) on photosynthesis and leaf characteristic...

ALBERT KR, MIKKELSEN TN, LINDEN L, RO-POULSEN H, MICHELSEN A, BEIER C (2013) Physiologia Plantarum : - in review

Antagonism between elevated CO2, nighttime warming, and summer drought reduces the robustness of PSII performance to freezing events

2013-06-10T17:45:08Z

K R ALBERT, K BOESGARD, H RO-POULSEN, T N MIKKELSEN, S ANDERSEN, K PILEGAARD (2013) Environmental and Experimental Botany 93: 1-12

Nitrous oxide emission from Ulva lactuca is stimulated by nitrite, nitrate and light. Results from batch-culture incubations

2013-06-10T17:45:53Z

K R ALBERT, A BRUHN, P AMBUS (2013) Journal of Experimental Marine Biology and Ecology : accepted

UV-induced N2O emission from terrestrial surfaces

2013-06-10T17:48:23Z

BRUHN D, ALBERT KR, MIKKELSEN TN, AMBUS P (2013) Biogeochemistry : - in review

Multi-factor climate change effects on insect herbivore performance

2013-05-05T10:50:12Z

In a multi-factor climate change experiment, we tested effects of three independent global change drivers on insect herbivore performance. We found that most drivers adversely affected herbivore performance. The most surprising result of our study, however, was that the number of global change drivers (0, 1, 2 or 3) additively affected herbivore performance.

SCHERBER C, GLADBACH D, STEVNBAK K, KARSTEN R, SCHMIDT IK, MICHELSEN A, ALBERT KR, STEENBERG LArRSEN K, MIKKELSEN TN, BEIER C, CHRISTENSEN S, (2013) Ecology and Evolution :

Solar UV-B effects on PSII performance in Betula nana are influenced by PAR level and reduced by EDU. Results of a 3-year experiment in the High Arctic

2012-06-07T09:43:31Z

The long-term and diurnal responses of photosystem II (PSII) performance to near-ambient UV-B radiation were investigated in High Arctic Betula nana. We conducted an UV exclusion experiment with five replicated blocks consisting of open control (no filter), photosynthetic active radiation and UV-B transparent filter control (Teflon), UV-B-absorbing filter (Mylar) and UV-AB-absorbing filter (Lexan)...

ALBERT KR, MIKKELSEN TN, RO-POULSEN H, ARNDAL MF, BOESGAARD K, MICHELSEN A, SCHMIDT NM (2012) Physiologia Plantarum 145: 485-500

Contrasting evergreen shrub vs. grass growth strategies, but similar eco-physiological responses to dry conditions in a temperate heath

2012-11-05T07:53:21Z

Future changes in precipitation patterns affect plant carbon uptake but the outcome depends much on individual plant species responses. We investigated the leaf level photosynthetic performance, leaf C, N and δ13C along with vegetation cover and biomass in the dwarf shrub Calluna vulgaris and the grass species Deschampsia flexuosa in a temperate heath during a season with dry and rewetting condit...

ALBERT KR, KONGSTAD J, SCHMIDTH IK, RO-POULSEN H, MIKKELSEN TN, MICHELSEN A, BEIER C (2012) Acta Oecologia 45: 79-85

Long-term structural canopy changes sustain net photosynthesis per ground area in high arctic Vaccinium uliginosum exposed to changes in near-ambient UV-B levels

2012-07-16T08:49:25Z

Full recovery of the ozone layer is not expected for several decades and consequently, the incoming level of solar ultraviolet-B (UV-B) will only slowly be reduced. Therefore to investigate the structural and photosynthetic responses to changes in solar UV-B we conducted a 5-year UV-B exclusion study in high arctic Greenland. During the growing season, the gas exchange (H2O and CO2) and chlorophyl...

BOESGAARD K, ALBERT KR, RO-POULSEN H, MICHELSEN A, MIKKELSEN T, SCHMIDTH N (2012) Physiologia Plantarum 145: 540-550

UV-induced carbon monoxide emission from sand and living vegetation

2012-12-20T14:28:43Z

The global burden of carbon monoxide, CO, is rather uncertain. In this paper we address the potential of UV-induced CO emission by terrestrial surfaces. Real-time measurements of [CO] were made with a cavity enhanced laser connected in closed loop to either an ecosystem chamber or a leaf scale chamber. Sand and leaves of all examined plant species exhibited emission of CO in response to artificial...

D BRUHN, KR ALBERT, TN MIKKELSEN, P AMBUS (2012) Biogeoscience Discussions 9: 8449-8473

Reduced N cycling in response to elevated CO2, warming, and drought in a Danish heathland: Synthesizing results of the CLIMAITE project after two years of treatments

2011-04-04T11:40:05Z

Field-scale experiments simulating realistic future climate scenarios are important tools for investigating the effects of current and future climate changes on ecosystem functioning and biogeochemical cycling. We exposed a seminatural Danish heathland ecosystem to elevated atmospheric carbon dioxide (CO2), warming, and extended summer drought in all combinations. Here, we report on the short-t...

LARSEN KS, ANDRESEN LC, CHRISTENSEN S, HOLMSTRUP M, MICHELSEN A, SCHMIDT IK, JONASSON S, ALBERT KR, AMBUS P, ARNDAL M, CARTER MS, IBROM A, KONGSTAD J, LINDEN LG, MARALDO K, MIKKELSEN TN, PILEGAARD K, PRIEMÉ A, RO-POULSEN H, STEVNBAK K, BEIER C (2011) Global Change Biology 17: 1884-1899

Effects of elevated atmospheric CO2, prolonged summer drought and temperature increase on N2O and CH4 fluxes in a temperate heathland

2011-06-08T08:12:38Z

In temperate regions, climate change is predicted to increase annual mean temperature and intensify the duration and frequency of summer droughts, which together with elevated atmospheric carbon dioxide (CO2) concentrations, may affect the exchange of nitrous oxide (N2O) and methane (CH4) between terrestrial ecosystems and the atmosphere. We report results from the CLIMAITE experiment, where th...

CARTER MS, AMBUS P, ALBERT KR, LARSEN KS, ANDERSSON M, PRIMÉ A, LINDEN L, BEIER C (2011) Soil Biology & Biochemistry 43: 1660-1670

Effects of elevated CO2, warming and drought episodes on plant carbon uptake in a temperate heath ecosystem are controlled by soil water status.

2011-06-15T07:47:40Z

The impact of elevated CO2, periodic drought and warming on photosynthesis and leaf characteristics of the evergreen dwarf shrub Calluna vulgaris in a temperate heath ecosystem was investigated. Photosynthesis was reduced by drought in midsummer and increased by elevated CO2 throughout the growing season, whereas warming only stimulated photosynthesis early in the year. At the beginning and end of...

ALBERT KR, RO-POULSEN H, MIKKELSEN TN, MICHELSEN A, LINDEN L, BEIER C (2011) Plant, Cell and Environment 34: 1207-1222

Interactive effects of drought, elevated CO2 and warming on photosynthetic capacity and photosystem performance in temperate heath plants

2011-06-22T07:44:38Z

Increased temperature, atmospheric CO2 and change in precipitation patterns affect plant physiological and ecosystem processes. In combination, the interactions between these effects result in complex responses that challenge our current understanding. In a multi-factorial field experiment with elevated CO2 (CO2, FACE), nighttime warming (T) and periodic drought (D) we investigated photosynthetic ...

ALBERT KR, MIKKELSEN TN, MICHELSEN A, RO-POULSEN H, LINDEN L, (2011) Journal of Plant Physiology 168: 1550-1561

Interactive effects of elevated CO2, warming and drought on photosynthesis of Deschampsia flexuosa in a temperate heath ecosystem

2011-10-14T12:12:07Z

Global change factors affect plant carbon uptake in concert. In order to investigate the response directions and potential interactive effects, and to understand the underlying mechanisms, multifactor experiments are needed. We focused on photosynthetic response to elevated CO2 (CO2, FACE), drought (D, water excluding curtains) and night time warming (T, IR-reflective curtains) in a temperate heat...

ALBERT KR, RO-POULSEN H, MIKKELSEN TN, MICHELSEN A, LINDEN L, BEIER C (2011) Journal of Experimental Botany 62: 4253-4266

Ambient UV-B radiation reduces PSII performance and net photosynthesis in high Arctic Salix arctica

2011-09-08T07:07:08Z

Ambient ultraviolet-B (UV-B) radiation potentially impacts the photosynthetic performance of high Arctic plants. We conducted an UV-B exclusion experiment in a dwarf shrub heath in NE Greenland (74°N), with open control, filter control, UV-B filtering and UV-AB filtering, all in combination with leaf angle control. Two sites with natural leaf positions had ground angles of 0° ([`]level site') an...

ALBERT K R, MIKKELSEN T N, RO-POULSEN H, ARNDAL M F, MICHELSEN A, (2011) Environmental and Experimental Botany 73: 10-18

Emissions of nitrous oxide from arable organic and conventional cropping systems on two soil types

2010-07-30T08:07:08Z

Agriculture Ecosystems & Environment 136: 3-4. pp199-208. Conventional cropping systems rely on targeted short-term fertility management, whereas organic systems depend, in part, on long-term increase in soil fertility as determined by crop rotation and management. Such differences influence soil nitrogen (N) cycling and availability through the year. The main objective of this study was to com...

N CHIRINDA, MS CARTER, KR ALBERT, P AMBUS, JE OLESEN, JR PORTER, SO PETERSEN (2010) Agriculture Ecosystems & Environment 136: 3-4 199-208

Improved UV-B screening capacity does not prevent negative effects of ambient UV irradiance on PSII performance in High Arctic plants. Results from a six year UV exclusion study

2011-07-25T08:43:51Z

Long-term responses of ambient solar ultraviolet (UV) radiation were investigated on Salix arctica and Vaccinium uliginosum in a High Arctic heath ecosystem in Zackenberg, northeast Greenland. Over a period of six years, UV exclusion was conducted in the growing season by means of filters: 60% UV-B reduction, 90% UV-B + UV-A reduction, UV transparent filter control, and an open control without ...

ALBERT KR, MIKKELSEN TN, RO-POULSEN H, MICHELSEN A, ARNDAL MF, BREDAHL L, HÅKANSSON KB, BOESGAARD K, SCHMIDT NM (2010) Journal of Plant Physiology 167: 1542-1549

Development of an accumulation-based system for cost-effective chamber measurements of inert trace gas fluxes

2010-09-17T11:32:52Z

As soil–atmosphere fluxes of greenhouse gases are characterized by high temporal fluctuations, frequent measurements in the range of hours to days need to be deployed, resulting in high analytical costs. We have therefore developed a new low-cost system that combines high-frequency automated sampling with low-frequency chemical analysis. The System for Inert Gas Monitoring by Accumulation (SI...

P AMBUS , U SKIBA, J DREWER, SK JONES, MS CARTER, KR ALBERT, MA SUTTON (2010) European Journal of Soil Science 61: 785-792

Seasonal Variation in Gross Ecosystem Production, Plant Biomass, and Carbon and Nitrogen Pools in Five High Arctic Vegetation Types

2010-08-04T08:30:17Z

Arctic, Antarctic, and Alpine Research, Vol. 41, No. 2, 2009, pp. 164–173. The Arctic is extremely vulnerable to projected climate change, and global warming may result in major community reorganizations. The aim of this study was a thorough investigation of plant biomass production throughout an entire growing season in five different high arctic vegetation types: Cassiope, Dryas, and Salix ...

MF ARNDAL, L ILLERIS, A MICHELSEN, KR ALBERT, M TAMSTORF, BU HANSEN (2009) Artic Antarctic and Alpine Research 41: 2 164-173

Ambient UV-B radiation decreases photosynthesis in high arctic Vaccinium uliginosum

2010-07-30T08:09:43Z

Physiologia Plantarum 133: 2. pp 199-210 . An UV-B-exclusion experiment was established in high arctic Zackenberg, Northeast Greenland, to investigate the possible effects of ambient UV-B on plant performance. During almost a whole growing season, canopy gas exchange and Chl fluorescence were measured on Vaccinium uliginosum (bog blueberry). Leaf area, biomass, carbon, nitrogen and UV-B-absorb...

KR ALBERT, TN MIKKELSEN, H RO-POULSEN (2008) Physiologia Plantarum 133: 2 199-210

Solar ultraviolet-B radiation at Zackenberg : The impact on higher plants and soil microbial communities

2010-08-04T08:33:40Z

ADVANCES IN ECOLOGICAL RESEARCH 40: 421-440. Depletion of the ozone layer and the consequent increase in solar ultraviolet‐B (UV‐B) radiation may impact living conditions for arctic plants significantly. In order to evaluate how the prevailing UV‐B fluxes aVect the heath ecosystem at Zackenberg (74300N, 20300W) and other high‐arctic regions, manipulation experiments with various set‐...

KR ALBERT, R RINNAN, H RO-POULSEN, MIKKELSEN TN, HÅKANSSON KB, ARNDAL MF, MICHELSEN A (2008) Advances in Ecological Research 40: 421-440

Experimental design of multifactor climate change experiments with elevated CO2, warming and drought : the CLIMAITE project

2010-07-30T09:37:28Z

Functional Ecology 22: 1. 185-195 1. Recent findings indicate that the interactions among CO2, temperature and water can be substantial, and that the combined effects on the biological systems of several factors may not be predicted from experiments with one or a few factors. Therefore realistic multifactorial experiments involving a larger set of main factors are needed. 2. We describe a ne...

MIKKELSEN TN , BEIER C, JONASSON S, HOLMSTRUB M, SCHMIDT IK, AMBUS P, PILEGAARD K, MICHELSEN A, ALBERT KR, ANDRESEN LC, ARNDAN MF, BRUUN N, CHRISTENSEN S, DANBÆK S, GUNDERSEN P, JØRGENSEN P, KONGSTAD J, MARALDO K, PRIMÉ A, RIIS-NIELSEN T, RO-POULSEN H, STEVNBAK K, SELSTED MB, SØRENSEN P, LARSEN KS, CARTER MS, MARTINUSSEN T, MIGLIETTA F, SVERDRUP H. (2008) Functional Ecology 22: 1 185-195

Effects of ambient versus reduced UV-B radiation on high arctic Salix arctica assessed by measurements and calculations of chlorophyll a fluorescence parameters from fluorescence transients

2010-07-30T08:17:01Z

Physiologia Plantarum 124: 2. 208-226 . A UV-B exclusion-experiment was conducted in the high Arctic Zackenberg, NE Greenland, in which Salix arctica leaves during most of the growing season were fixed perpendicular to the solar zenith angle, thereby receiving maximal solar radiation. Covered with Teflon and Mylar foil, the leaves received approximately 90 and 40% of the ambient UV-B irradia...

KR ALBERT, TN MIKKELSEN, H RO-POULSEN (2005) Physiologia Plantarum 124: 2 208-226

Effects of reducing the ambient UV-B radiation in the high arctic on Salix arctica and Vaccinium uliginosum

2010-08-04T08:30:49Z

ALBERT K.R., RO-POULSEN H., MIKKELSEN T.N., BREDAHL L. & HAAKANSSON K.B. 2004. Effects of reducing the ambient UV-B radiation in the high arctic on Salix arctica and Vaccin-ium uliginosum. - Phyton 45 (4): (41)-(49). Effects of reducing the ambient UV-B radiation on gas exchange and chlorophyll fluores-cence of two dwarf shrub species, Salix arctica and Vaccinium uliginosum, was studied in a high...

KR ALBERT, H RO-POULSEN, TN MIKKELSEN, et al. (2005) Phyton-Annales Rei Botanicae 45: 4 41-49