A5074630020- Plant Water Relations and Carbon Dynamics
- Ecology and Vegetation Dynamics Studies
- Forest ecology and management
- Forest Ecology and Biodiversity Studies
- Forest Management and Policy
- Atmospheric and Environmental Gas Dynamics
- Peatlands and Wetlands Ecology
- Soil Carbon and Nitrogen Dynamics
- Plant responses to elevated CO2
- Botany and Plant Ecology Studies
- Tree-ring climate responses
- Plant and animal studies
- Fire effects on ecosystems
- Ecology, Conservation, and Geographical Studies
- Atmospheric chemistry and aerosols
- Soil and Water Nutrient Dynamics
- Lichen and fungal ecology
- Plant Stress Responses and Tolerance
- Climate variability and models
- Plant Parasitism and Resistance
- Mycorrhizal Fungi and Plant Interactions
- Climate change and permafrost
- Geology and Paleoclimatology Research
- Environmental Science and Technology
- Plant nutrient uptake and metabolism
Max Planck Institute for Biogeochemistry
2015-2024
Max Planck Society
2012-2021
University of Göttingen
1966-2016
Helmholtz Centre for Environmental Research
2011
Helmholtz Zentrum München
2011
Institute of Groundwater Ecology
2011
Technische Universität Berlin
1988-2008
University of Antwerp
2003
Laboratoire des Sciences du Climat et de l'Environnement
2003
University of Aberdeen
2003
At eight European field sites, the impact of loss plant diversity on primary productivity was simulated by synthesizing grassland communities with different numbers species. Results differed in detail at each location, but there an overall log-linear reduction average aboveground biomass For a given number species, fewer functional groups were less productive. These effects occurred along differences associated species composition and geographic location . Niche complementarity positive...
Species distribution models (SDMs) are numerical tools that combine observations of species occurrence or abundance with environmental estimates. They used to gain ecological and evolutionary insights predict distributions across landscapes, ...Read More
Global biogeochemical models have improved dramatically in the last decade their representation of biosphere. Although leaf area data are an important input to such and readily available globally, global root distributions for modeling water nutrient uptake carbon cycling not been available. This analysis provides fine biomass, length, surface with depth soil, estimates pools roots. Calculated is almost always greater than area, more order magnitude so grasslands. The average C:N:P ratio...
The biodiversity-productivity relationship (BPR) is foundational to our understanding of the global extinction crisis and its impacts on ecosystem functioning. Understanding BPR critical for accurate valuation effective conservation biodiversity. Using ground-sourced data from 777,126 permanent plots, spanning 44 countries most terrestrial biomes, we reveal a globally consistent positive concave-down BPR, showing that continued biodiversity loss would result in an accelerating decline forest...
Summary This paper presents CO 2 flux data from 18 forest ecosystems, studied in the European Union funded EUROFLUX project. Overall, mean annual gross primary productivity (GPP, total amount of carbon (C) fixed during photosynthesis) these forests was 1380 ± 330 gC m −2 y −1 (mean ±SD). On average, 80% GPP respired by autotrophs and heterotrophs released back into atmosphere (total ecosystem respiration, TER = 1100 260 ). Mean soil respiration (SR) 760 340 (55% 69% TER). Among investigated...
Abstract Terrestrial ecosystems sequester 2.1 Pg of atmospheric carbon annually. A large amount the terrestrial sink is realized by forests. However, considerable uncertainties remain regarding fate this over both short and long timescales. Relevant data to address these are being collected at many sites around world, but syntheses still sparse. To facilitate future synthesis activities, we have assembled a comprehensive global database for forest ecosystems, which includes budget variables...
Symptoms of forest decline spruce in Europe range from needle yellowing and loss to tree stand mortality. In a study area northeast Bavaria, West Germany, where was initially detected, exposure high concentrations gaseous pollutants, SO(2,) NO(x,) ozone has had no long-lasting direct effect on needles, pathogens have only been secondary agents. Deposition sulfur, nitrate, ammonium, however, significantly modified plant nutrition soil chemistry. Spruce roots apparently take up ammonium rather...
ABSTRACT A model is presented which solves simultaneously for leaf‐scale stomatal conductance, CO 2 assimilation and the energy balance as a function of leaf position within canopies well‐watered vegetation. Fluxes conductances were calculated separately sunlit shaded leaves. linear dependence photosynthetic capacity on nitrogen content was assumed, while light intensity assumed to decrease exponentially canopies. Separate extinction coefficients used diffuse direct beam radiation. An...
This review provides a theoretical framework and global maps for relations between nitrogen-(N)-nutrition stomatal conductance, gs' at the leaf scale flUXe!1 of water vapor carbon dioxide canopy scale. theory defines boundaries observed rates maximum surface Gsmax, its relation to area index, A, within range max imum conductances. gsmax. Soil evaporation compensates reduced contribution plants total ecosystem loss A < 4. Thus, Gsmax is fairly independent changes in broad vegetation types....
This review describes the current hypotheses of how humidity and plant soil water status may interact regulate stomatal conductance photosynthesis. will focus on effects 1. humidity, 2. leaf potential turgor, 3. conductance, transpiration, CO/sub 2/ assimilation.
Most inverse atmospheric models report considerable uptake of carbon dioxide in Europe's terrestrial biosphere. In contrast, stocks ecosystems increase at a much smaller rate, with gains forests and grassland soils almost being offset by losses from cropland peat soils. Accounting for non-carbon transfers that are not detected the fluxes bypassing ecosystem considerably reduces gap between small carbon-stock changes larger estimated models. The remaining difference could be because missing...