A5021185243- Peatlands and Wetlands Ecology
- Atmospheric and Environmental Gas Dynamics
- Soil Carbon and Nitrogen Dynamics
- Climate change and permafrost
- Plant Water Relations and Carbon Dynamics
- Soil and Water Nutrient Dynamics
- Cryospheric studies and observations
- Fire effects on ecosystems
- Methane Hydrates and Related Phenomena
- Botany and Plant Ecology Studies
- Coastal wetland ecosystem dynamics
- Soil and Unsaturated Flow
- Forest ecology and management
- Wastewater Treatment and Nitrogen Removal
- Geology and Paleoclimatology Research
- Marine and coastal ecosystems
- Science and Climate Studies
- Hydrology and Watershed Management Studies
- Plant nutrient uptake and metabolism
- Tree-ring climate responses
- Remote Sensing in Agriculture
- Microbial Community Ecology and Physiology
- Forest Ecology and Biodiversity Studies
- Bioenergy crop production and management
- Climate variability and models
University of Gothenburg
2015-2024
Lund University
2023
University of Sheffield
2023
Google (United States)
2020
Mediterranean Center for Environmental Studies
2018
Institute of Agrophysics, Polish Academy of Sciences
2018
University of Nebraska–Lincoln
2018
Joint Research Centre
2018
Université Toulouse III - Paul Sabatier
2018
Agricultural Research Service
2013
This study investigated patterns and controls of the seasonal inter‐annual variations in energy fluxes (i.e., sensible heat, H , latent λE ) partitioning water budget precipitation, P ; evapotranspiration, ET discharge, Q soil storage, ∆S over five years (2001–2005) a boreal oligotrophic fen northern Sweden based on continuous eddy covariance, table level ( WTL ), weir measurements. For growing season (May 1 to September 31), 5 year averages (± standard deviation) midday (10:00 14:00 h)...
Summary This paper reports the range and statistical distribution of oxidation rates atmospheric CH 4 in soils found Northern Europe an international study, compares them with published data for various other ecosystems. It reassesses size, uncertainty in, global terrestrial sink, examines effect land‐use change factors on rate. Only a very high water table were sources ; all others sinks. Oxidation varied from 1 to nearly 200 μg m −2 h −1 annual sites measured ≥1 y 0.1–9.1 kg ha ,...
Abstract. The nitrogen (N) cycle contains two different processes of dissimilatory nitrate (NO3−) reduction, denitrification and NO3− reduction to ammonium (DNRA). While there is general agreement that the process takes place in many soils, occurrence importance DNRA generally not considered. Two approaches have been used investigate soil, (1) microbiological techniques identify soil microorganisms capable (2) 15N tracing elucidate quantify gross rates. There evidence bacteria fungi ability...
Abstract Based on theories of mire development and responses to a changing climate, the current role mires as net carbon sink has been questioned. A rigorous evaluation C‐exchange in requires measurements all relevant fluxes. Estimates annual total budgets are still very limited. Here, we present full budget over 2 years for boreal minerogenic oligotrophic northern Sweden (64°11′N, 19°33′E). Data following fluxes were collected: land–atmosphere CO exchange (continuous Eddy covariance...
Nitrous oxide (N2O) is a powerful greenhouse gas and the main driver of stratospheric ozone depletion. Since soils are largest source N2O, predicting soil response to changes in climate or land use central understanding managing N2O. Here we find that N2O flux can be predicted by models incorporating nitrate concentration (NO3-), water content temperature using global field survey emissions potential driving factors across wide range organic soils. increase with NO3- follow bell-shaped...
Miniaturized thermal infrared (TIR) cameras that measure surface temperature are increasingly available for use with unmanned aerial vehicles (UAVs). However, deriving accurate data from these is non-trivialsince they highly sensitive to changes in their internal and low-cost models often not radiometrically calibrated. We present the results of laboratory field experiments tested extent temperature-dependency a non-radiometric FLIR Vue Pro 640. found simple empirical line calibration using...
Abstract. Plant transpiration links physiological responses of vegetation to water supply and demand with hydrological, energy, carbon budgets at the land–atmosphere interface. However, despite being main land evaporative flux global scale, its response environmental drivers are currently not well constrained by observations. Here we introduce first compilation whole-plant data from sap flow measurements (SAPFLUXNET, https://sapfluxnet.creaf.cat/, last access: 8 June 2021). We harmonized...
Abstract Forested histosols have been found in some cases to be major, and other minor, sources of the greenhouse gas nitrous oxide (N 2 O). In order estimate total national or global emissions N O from histosols, scaling mapping parameters that can separate low‐ high‐emitting sites are needed, should included soil databases. Based on interannual measurements drained forested Sweden, we a strong negative relationship between CN ratios ( r adj =0.96, mean annual emission= e (− b ratio) ). The...
Abstract Disturbance of ecosystems is a major factor in regional carbon budgets, and it believed to be partly responsible for the large inter‐annual variability terrestrial part balance. Forest fires have so far been considered as most important disturbance but also other forms such insect outbreaks or wind‐throw might contribute significantly largely unexplained variability, at least specific regions. The effect has not yet estimated because lack data on how fluxes are affected. Gudrun...
Mires are key landscape elements at high latitudes and have certainly accumulated carbon during the Holocene, but their current balance present time is very unclear. The major flux land‐atmosphere CO 2 exchange full‐year data still limited. Here we from 3 a (2001–2003) of continuous Eddy Covariance measurements Degerö Stormyr (64°11′N, 19°33′E) an oligotrophic, minerotrophic mire in Sweden. climate site defined as cold temperate humid, with 30‐a annual precipitation temperature means 523 mm...
Summary Greenhouse gas (GHG) emissions from farmed organic soils can have a major impact on national emission budgets. This investigation was conducted to evaluate whether afforestation of such could mitigate this problem. Over the period 1994–1997, methane (CH 4 ) and nitrous oxide (N 2 O) were recorded an soil site in Sweden, forested with silver birch ( Betula pendula Roth), using static field chambers. The used for grazing prior forestation. Soil pH carbon content varied greatly across...
Abstract Lakes are major sources of methane (CH 4 ) to the atmosphere that contribute significantly global budget. Recent studies have shown diffusive fluxes, ebullition and surface water CH concentrations can differ within lakes—spatially temporally. fluxes may be affected at longer scales in response seasons, temperature, lake mixing events, short term weather events like pressure variations, shifting winds diel cycles. Frequent measurements same system integrated assessments impacts...
Abstract Chamber measurements of trace gas fluxes between the land surface and atmosphere have been conducted for almost a century. Different chamber techniques, including static dynamic, used with varying degrees success in estimating greenhouse gases (CO 2 , CH 4 N O) fluxes. However, all these certain disadvantages which either prevented them from providing an adequate estimate exchange or restricted to be under limited conditions. Generally, methods are relatively low cost simple...
Abstract Commercially available fast-response analysers for methane (CH 4 ) and nitrous oxide (N 2 O) have recently become more sensitive, robust easier to operate. This has made their application long-term flux measurements with the eddy-covariance method feasible. Unlike carbon dioxide (CO water vapour (H O), there so far been no guidelines on how optimise standardise measurements. paper reviews state-of-the-art of various steps discusses aspects such as instrument selection, setup...
We analysed the effect of 2018 European drought on greenhouse gas (GHG) exchange five North mire ecosystems. The low precipitation and high summer temperatures in Fennoscandia led to a lowered water table majority these mires. This both carbon dioxide (CO2) uptake methane (CH4) emission during 2018, turning three out mires from CO2 sinks sources. calculated radiative forcing showed that drought-induced changes GHG fluxes first resulted cooling lasting 15-50 years, due CH4 emission, which was...
The Nordic region was subjected to severe drought in 2018 with a particularly long-lasting and large soil water deficit Denmark, Southern Sweden Estonia. Here, we analyse the impact of on carbon fluxes 11 forest ecosystems different composition: spruce, pine, mixed deciduous. We assess by estimating difference (anomaly) between year reference without drought. Unexpectedly, evaporation only slightly reduced during compared at two sites while it increased or nearly unchanged all other sites....
Abstract Soil processes in high‐latitude regions during winter are important contributors to global carbon circulation, but our understanding of the mechanisms controlling these is poor and observed temperature response coefficients CO 2 production frozen soils deviate markedly from thermodynamically predicted responses (sometimes by several orders magnitude). We investigated 23 unfrozen surface soil samples various types boreal forests peatland ecosystems also measured changes water content...
• Effects of warming on root morphology, mass distribution and microbial activity were studied in organic mineral soil layers two alpine ecosystems over > 10 yr, using open-top chambers, Swedish Lapland. Root was estimated cores. Washed roots scanned sorted into four diameter classes, for which variables including (g dry matter DM) m−2), length density (RLD; cm cm−3 soil), specific (SRL; m g DM−1), area (SRA; m2 kg number tips m−2 determined. Nitrification (NEA) denitrification enzyme (DEA)...
The winter CO 2 efflux from subnivean environments is an important component of annual C budgets in Arctic ecosystems and consequently makes prediction estimations processes as well incorporations these into existing models important. Several methods have been used for estimating effluxes involving different assumptions about the snowpack, all aiming to quantify production. Here, four are compared discussed: (1) measurements with a chamber on snow surface, F , (2) directly soil, soil after...