A5008314512- Soil Carbon and Nitrogen Dynamics
- Plant Water Relations and Carbon Dynamics
- Peatlands and Wetlands Ecology
- Soil and Water Nutrient Dynamics
- Atmospheric and Environmental Gas Dynamics
- Forest ecology and management
- Soil and Unsaturated Flow
- Forest Management and Policy
- Hydrology and Watershed Management Studies
- Climate variability and models
- Tree-ring climate responses
- Microbial Community Ecology and Physiology
- Remote Sensing in Agriculture
- Fluid Dynamics and Turbulent Flows
- Simulation Techniques and Applications
- Remote Sensing and LiDAR Applications
- Bioenergy crop production and management
- Cryospheric studies and observations
- Scientific Computing and Data Management
- Soil Geostatistics and Mapping
- Meteorological Phenomena and Simulations
- Plant responses to elevated CO2
- Aerodynamics and Acoustics in Jet Flows
- Botany and Plant Ecology Studies
- Plant Ecology and Soil Science
Max Planck Institute for Biogeochemistry
2015-2025
University of Edinburgh
2021
National Centre for Earth Observation
2021
Max Planck Society
2005-2013
Friedrich Schiller University Jena
2008
TU Dresden
2006
Abstract. With the eddy covariance (EC) technique, net fluxes of carbon dioxide (CO2) and other trace gases as well water energy can be measured at ecosystem level. These flux measurements are a main source for understanding biosphere–atmosphere interactions feedbacks through cross-site analysis, model–data integration, upscaling. The raw with EC technique require extensive laborious data processing. While there standard tools1 available in an open-source environment processing...
Abstract Aim To infer a forest carbon density map at 0.01° resolution from radar remote sensing product for the estimation of stocks in Northern Hemisphere boreal and temperate forests. Location The study area extends 30° N to 80° , covering three biomes – broadleaf mixed forests ( TBMF ), conifer TCF ) BFT over continents orth A merica, E urope sia). Methods This is based on recently available growing stock volume GSV retrieved synthetic aperture data. Forest biomass spatially explicit...
The effect of temperature and the influence fresh substrate addition on soil organic matter decomposition are two key factors we need to understand forecast carbon dynamics under climate change rising CO2 levels. Here perform a laboratory incubation experiment address following questions: 1) Does sensitivity differ between freshly added bulk carbon? 2) stimulate ("priming effect")? 3) If so, does this priming depend temperature? In our study, incubated sieved samples without with labelled...
Sun-induced fluorescence (SIF) in the far-red region provides a new noninvasive measurement approach that has potential to quantify dynamic changes light-use efficiency and gross primary production (GPP). However, mechanistic link between GPP SIF is not completely understood. We analyzed structural functional factors controlling emission of at 760 nm (F760 ) Mediterranean grassland manipulated with nutrient addition nitrogen (N), phosphorous (P) or nitrogen-phosphorous (NP). Using...
Abstract Soil water content is a key variable for biogeochemical and atmospheric coupled processes. Its small‐scale heterogeneity impacts the partitioning of precipitation (e.g., deep percolation or transpiration) by triggering threshold processes connecting flow paths. Forest hydrologists frequently hypothesized that throughfall stemflow patterns induce soil heterogeneity, yet experimental validation limited. Here, we pursued pattern‐oriented approach to explore relationship between net...
Abstract Globally, soils store two to three times as much carbon currently resides in the atmosphere, and it is critical understand how soil greenhouse gas (GHG) emissions uptake will respond ongoing climate change. In particular, soil‐to‐atmosphere CO 2 flux, commonly though imprecisely termed respiration ( R S ), one of largest fluxes Earth system. An increasing number high‐frequency measurements (typically, from an automated system with hourly sampling) have been made over last decades;...
The sensitivity of photosynthesis to environmental changes is essential for understanding carbon cycle responses global climate change and the development modeling approaches that explains its spatial temporal variability. We collected a large variety published functions gross primary productivity (GPP) different forcing variables assess response GPP factors. These include temperature; vapor pressure deficit, some which atmospheric CO2 concentrations; soil water availability (W); light...
Abstract. Many projections of the soil carbon sink or source are based on kinetically defined pool models. Para\\-meters these models often determined in a way that steady state model matches observed stocks. The underlying simplifying assumption is stocks near equilibrium. This challenged by observations very old soils do still accumulate carbon. In this modelling study we explored consequences case where apart from Calculation equilibrium states currently accumulating small amounts were...
This study provides a comprehensive set of functions for predicting biomass Common beech ( Fagus sylvatica L.) in Central Europe all major tree compartments. The equations are based on data stem, branch, timber, brushwood (wood with diameter below 5 or 7 cm), foliage, root, and total aboveground 443 trees from 13 studies. We used nonlinear mixed-effects models to assess the contribution fixed effects (tree dimensions, site descriptors), random (grouping according studies), residual variance...
Abstract. Decomposition of soil organic matter (SOM) is limited by both the available substrate and active decomposer community. The understanding this colimitation strongly affects feedbacks carbon to global warming its consequences. This study compares different formulations decomposition. We compiled from literature into groups according representation biomass on SOM decomposition rate a) non-explicit (substrate only), b) linear, c) non-linear. By varying equation in a basic simplified...
Abstract. This study investigates the performances of different optical indices to estimate gross primary production (GPP) herbaceous stratum in a Mediterranean savanna with nitrogen (N) and phosphorous (P) availability. Sun-induced chlorophyll fluorescence yield computed at 760 nm (Fy760), scaled photochemical reflectance index (sPRI), MERIS terrestrial-chlorophyll (MTCI) normalized difference vegetation (NDVI) were from near-surface field spectroscopy measurements collected using high...
Abstract. Plant–soil interactions, such as the coupling of plants' below-ground biomass allocation with soil organic matter (SOM) decomposition, nutrient release and plant uptake, are essential to understand response carbon (C) cycling global changes. However, these processes poorly represented in current terrestrial biosphere models owing simple first-order approach SOM ignorance variations within a profile. While emerging microbially explicit C can better describe formation turnover, at...
<ja:p>Countries need to assess changes in the carbon stocks of forest soils as a part national greenhouse gas (GHG) inventories under United Nations Framework Convention on Climate Change (UNFCCC) and Kyoto Protocol (KP). Since measuring these is expensive, it likely that many countries will use alternative methods prepare estimates. We reviewed seven well-known soil models from point view preparing country-scale C change first introduced explained how they incorporated most important input...
Abstract. The vertical distribution of soil organic matter (SOM) in the profile may constitute an important factor for carbon cycling. However, formation SOM is currently poorly understood due to equifinality, caused by entanglement several processes: input from roots, mixing bioturbation, and leaching. In this study we quantified contribution these three processes using Bayesian parameter estimation mechanistic model SOMPROF. Based on measurements, 13 parameters related decomposition...
Abstract. Interactions between different qualities of soil organic matter (SOM) affecting their turnover are rarely represented in models. In this study, we propose three mathematical strategies at levels abstraction to represent those interactions. By implementing these into the Introductory Carbon Balance Model (ICBM) and applying them several scenarios litter input, show that applicable timescales. We present a simple one-parameter equation substrate limitation can straightforwardly be...
The inter-annual variability (IAV) of the terrestrial carbon cycle is tightly linked to semi-arid ecosystems. Thus, it utmost importance understand what main meteorological drivers for IAV such ecosystems are, and how they respond extreme events as droughts heatwaves. To shed light onto these questions, we analyse fluxes, its relation with variables, impact compound drought heatwave on two similar ecosystems, along a precipitation gradient. A four-year long dataset from 2016 2019 was used...
Abstract Nutrient availability, especially of nitrogen (N) and phosphorus (P), is major importance for every organism at a larger scale ecosystem functioning productivity. Changes in nutrient availability potential stoichiometric imbalance due to anthropogenic deposition might lead deficiency or alter various ways. In this study, we present 6 years (2014–2020) flux‐, plant‐, remote sensing data from large‐scale manipulation experiment conducted Mediterranean savanna‐type with an emphasis on...
Abstract Temperate forest ecosystems have recently been identified as an important net sink in the global carbon budget. The factors responsible for strength of sinks and their permanence, however, are less evident. In this paper, we quantify present sequestration Thuringian managed coniferous forests. We effects indirect human‐induced environmental changes (increasing temperature, increasing atmospheric CO 2 concentration nitrogen fertilization), during last century using BIOME‐BGC, well...
Carbon dioxide (CO&#8322;) flux partitioning involves separating net ecosystem exchange (NEE) into its gross primary production (GPP) and respiration (RECO) components. Despite 25 years of research abundant data from networks such as FLUXNET [1], the development validation new methods remain hindered by lack a standardized benchmark dataset evaluation protocol. Existing parametric methods, including nighttime (NT) [2] daytime (DT) [3] approaches, have become integral to products but face...
Heatwaves are well-documented drivers of adverse health outcomes and socio-economic disruptions, yet regional variations in risk, particularly the case multi-hazard scenarios, remain insufficiently understood. Understanding these is critical for development targeted strategies to mitigate outcomes. Most studies examining extreme heat terms associated mortality focus on temperature influence alone, often neglecting role coinciding environmental conditions, such as moisture. While those that...
Abstract. With the eddy-covariance (EC) technique, net fluxes of carbon dioxide (CO2) and other greenhouse gases as well water energy can be measured at ecosystem level. These flux measurements are a main source for understanding biosphere-atmosphere interactions feedbacks by cross-site analysis, model-data integration, up-scaling. The raw with EC technique require an extensive laborious data processing. While there standard tools available in open environment processing high-frequency (10...
Abstract. Soils of temperate forests store significant amounts organic matter and are considered to be net sinks atmospheric CO2. Soil carbon (SOC) turnover has been studied using the Δ14C values bulk SOC or different fractions as observational constraints in models. Further, CO2 that evolved during incubation soil roots have widely used together with total respiration partition into heterotrophic (HR) rhizosphere respiration. However, these data not joint determine times. Thus, we focus on...