A5047524789- Plant Water Relations and Carbon Dynamics
- Forest ecology and management
- Climate variability and models
- Atmospheric and Environmental Gas Dynamics
- Fire effects on ecosystems
- Meteorological Phenomena and Simulations
- Aeolian processes and effects
- Plant responses to elevated CO2
- Heat Transfer Mechanisms
- Tree Root and Stability Studies
- Agroforestry and silvopastoral systems
- Fluid Dynamics and Turbulent Flows
- Hydrology and Watershed Management Studies
- Environmental Impact and Sustainability
- Oil Palm Production and Sustainability
- Geothermal Energy Systems and Applications
- Tree-ring climate responses
- Peatlands and Wetlands Ecology
- Solar Radiation and Photovoltaics
- Forest Management and Policy
- Conservation, Biodiversity, and Resource Management
- Seedling growth and survival studies
- Odor and Emission Control Technologies
- Water resources management and optimization
- Forest Biomass Utilization and Management
University of Göttingen
2019-2024
Understanding the critical soil moisture (SM) threshold (θcrit ) of plant water stress and land surface energy partitioning is a basis to evaluate drought impacts improve models for predicting future ecosystem condition climate. Quantifying θcrit across biomes climates challenging because observations fluxes SM remain sparse. Here, we used latest database eddy covariance measurements estimate Europe by evaluating evaporative fraction (EF)-SM relationships investigating between vapor pressure...
Abstract Intensively managed open croplands are highly productive but often have deleterious environmental impacts. Temperate agroforestry potentially improves ecosystem functions, although comprehensive analysis is lacking. Here, we measured primary data on 47 indicators of seven functions in and 16 four grasslands to assess how alley-cropping performs compared cropland grassland. Carbon sequestration, habitat for soil biological activity, wind erosion resistance improved ( P ≤ 0.03)...
While the eddy covariance (EC) technique is a well-established method for measuring water fluxes (i.e., evaporation or 'evapotranspiration', ET), measurement susceptible to many uncertainties. One such issue potential underestimation of ET when relative humidity (RH) high (>70%), due low-pass filtering with some EC systems. Yet, this different types systems (e.g. open-path closed-path sensors) has not been characterized synthesis datasets as widely used FLUXNET2015 dataset. Here, we assess...
Abstract. Spatial heterogeneity in terrestrial ecosystems compromises the accuracy of eddy covariance measurements. An example heterogeneous are temperate agroforestry systems, that have been poorly studied by covariance. Agroforestry systems get an increasing attention due to their potential environmental benefits, e.g. a higher carbon sequestration, enhanced microclimate and erosion reduction compared monocropping agricultural systems. Lower-cost setups might offer opportunity reduce this...
Forests are important natural carbon sinks and can help mitigate climate change. The drought heat waves of recent years have severely affected forests in Germany, resulting reduced net CO2 uptake. How forest management, age species composition moderate the negative impacts weather extremes on uptake or its recovery is still unknown.For around 25 years, gross primary production, ecosystem respiration exchange as well evapotranspiration been studied a unmanaged, uneven-aged mixed beech stand...
The O2:CO2 exchange ratio of land-atmosphere fluxes (ER) can be used to identify sources and sinks CO2 in land ecosystems. During photosynthesis, the ER at leaf level is approximately -1 mol mol-1, reflecting uptake one mole associated with release O2. However, entire ecosystems largely unknown.Here we present a unique dataset two years continuous O2 flux measurements agricultural FLUXNET site Reinshof (51°29'24.0"N, 9°55'55.2"E, DE-Rns) near Göttingen, Germany,...
Dual-isotope eddy covariance measurements offer a novel approach for studying water fluxes in ecosystems, providing detailed insights into evapotranspiration (ET) and its components, evaporation (E) transpiration (T). During the 2024 growing season, dual-isotope system was deployed over winter wheat cropland central Germany, integrating Los Gatos Research (LGR) Water Vapor Isotope Analyzer with conventional setup. This continuously measured isotopic (δD δ18O) alongside...
Nitrous oxide (N2O) fluxes exhibit a high temporal and spatial variability, making their accurate quantification challenging. Recently, the eddy covariance (EC) technique has become available for N2O measurements, providing non-intrusive spatially integrated flux data at resolution (half-hourly from 10 Hz raw data), which can give valuable insights in underlying drivers when combined with ancillary measurements.Since April 2022, we measure by EC using fast response closed-path analyzer (Los...
Wind erosion is seen as one of the main risks for modern agriculture in dry and sandy regions. Shelterbelts agroforestry systems are known their ability to reduce wind speed and, consequently, erosion. The current study considers temperate alley cropping systems, where multiple tree strips (shelterbelts) interleaved with either annual rotating crops or perennial grassland. aim was quantify potential reduction by effect design decisions a case Germany. By combining measurements Large Eddy...
Abstract. Heterogeneous land surfaces require multiple measurement units for spatially adequate sampling and representative fluxes. The complexity cost of traditional eddy covariance (EC) set-ups typically limits the feasible number units. Therefore, new low-cost systems provide ideal opportunities replicated sampling. aim this study was to test performance a compact, pressure, temperature relative humidity sensor application evapotranspiration measurements by over agroforestry conventional...
Abstract. In the past few years, interest in growing crops and trees for bioenergy production has increased. One agricultural practice is mixed cultivation of fast-growing annual or perennial grasslands on same piece land, which referred to as one type agroforestry (AF). The inclusion tree strips into landscape been shown – hand lead reduced wind speeds higher carbon sequestration above ground soil. On other hand, concerns have raised about increased water losses atmosphere via...
Novel, lower-cost setups of eddy covariance systems may offer a potential solution to the spatial replication problem single flux towers. Prior their widespread application, it is essential conduct comprehensive testing against conventional ensure accuracy and precision measurements. In this study, we performed comparison between three based on (approximately 33 % cost infrared gas analyzer) slow-response carbon dioxide (CO2) relative humidity (RH) sensors setup for measuring...
Abstract. Eddy covariance (EC) measurements can provide direct and non-invasive ecosystem of the exchange energy, water (H2O) carbon dioxide (CO2). However, conventional eddy (CON-EC) setups (ultrasonic anemometer infrared gas analyser) be expensive, which recently led to development lower-cost (LC-EC) setups. In current study we test performance a LC-EC setup for CO2 H2O flux at an agroforestry adjacent grassland site in temperate northern Germany. The closed-path was compared with CON-EC...
In tall vegetation canopies, calm weather conditions may result in the formation of an isolated below-canopy air layer. Especially during night, carbon dioxide (CO2) fluxes be concealed from above-canopy eddy covariance (EC) measurements, masking magnitude CO2 net ecosystem exchange (NEE). Particular attention to this "nighttime problem" needs paid oil palm (Elaeis guineensis Jacq.) plantations, which can form a dense top canopy and are grown tropical regions where wind speeds often low....
Abstract. Eddy covariance has evolved as the method of choice for measurements ecosystem-atmosphere exchange water vapour, sensible heat and trace gases. Under ideal conditions eddy provides direct precise flux observations, commonly approximated from single point measurements. While is appropriate over uniform terrain infinite extent, heterogeneous land surfaces compromise representativity single-point a predictor ecosystem-wide fluxes violate assumptions method. Therefore require multiple...
Eddy covariance (EC) studies typically involve the use of one or maximum two measuring towers, which leads to a low level spatial replication, compromising statistical representativity EC measurements, especially above highly heterogeneous ecosystems, such as agroforestry systems. Lower-cost eddy setups (LC-EC) represent potential solution this problem, since their affordability allows for installation multiple towers study heterogeneity at landscape scale. In last years, several LC-EC have...
Abstract. Eddy covariance (EC) measurements can provide direct and non-invasive ecosystem of the exchange energy, water (H2O) carbon dioxide (CO2). However, conventional eddy (CON-EC) setups (ultrasonic anemometer infrared gas analyser) be expensive, which recently led to development lower-cost (LC-EC) (University Exeter). In current study, we tested performance an LC-EC setup for CO2 H2O flux at agroforestry adjacent grassland site in a temperate northern Germany. The closed-path was...
Novel lower-cost set-ups of eddy covariance systems might provide a solution to the spatial replication problem single flux towers. Before widely applying such set-ups, they need be thoroughly tested against conventional ensure accuracy and precision measurements. In this study, we performed comparison three based on cheaper (around 33% cost gas analyzer) slow-response carbon dioxide (CO2) relative humidity (RH) sensors with set-up for measuring latent heat fluxes above monocropping...
While the eddy covariance (EC) technique is a well-established method for measuring water fluxes (i.e., evaporation or 'evapotranspiration’, ET), susceptible to many uncertainties. One such issue potential underestimation of ET when relative humidity (RH) high (>70%), due low-pass filtering with some EC systems. The influence these errors different types systems (e.g. open- closed-path sensors) has not been characterized synthesis datasets as widely used FLUXNET2015 dataset. Here, we assess...
Abstract. In past years the interest in growing crops and trees for bioenergy production increased. One agricultural practice is mixed cultivation of fast annual or perennial grass-lands on same piece land, referred to as one type agroforestry. The inclusion tree strips into landscape has been shown – hand lead reduced wind speeds higher carbon sequestration above-ground soil. On other hand, concerns have risen about increased water losses atmosphere via evapotranspiration (ET). Therefore it...
In tall vegetation canopies, calm weather conditions may result in the formation of an isolated below-canopy air layer. Especially during night, carbon dioxide (CO2) fluxes be concealed from above-canopy eddy covariance (EC) measurements, resulting underestimation CO2 net ecosystem exchange (NEE). Particular attention to this “nighttime problem” needs paid oil palm (Elaeis guineensis Jacq.) plantations, which can form a dense top canopy and are grown tropical regions where wind speeds often...