M. Reichstein results 16
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Non‐Abrupt Vegetation Changes due to Altered Nutrient Balance Make Complex Scale‐Dependent Warming and Cooling EffectsNARA Subscribed
Land‐atmosphere exchanges are mediated by biophysical properties (e.g., albedo change, evaporative cooling) and biogeochemical cycle (e.g., CO 2 fluxes), with both processes exerting global feedback as radiative forcing (). While most research on concentrated on the impact of abrupt vegetation changes, this study investigates the effects on non‐abrupt changes due to altered nutrient levels (i.e., nitrogen [] and phosphorus []...
Nutrients and water availability constrain the seasonality of vegetation activity in a Mediterranean ecosystemNARA Subscribed
Anthropogenic nitrogen (N) deposition and resulting differences in ecosystem N and phosphorus (P) ratios are expected to impact photosynthetic capacity, that is, maximum gross primary productivity (GPP max ). However, the interplay between N and P availability with other critical resources on seasonal dynamics of ecosystem productivity remains largely unknown. In a Mediterranean tree–grass ecosystem, we established three lands...
TRY plant trait database – enhanced coverage and open accessNARA Subscribed
Plant traits—the morphological, anatomical, physiological, biochemical and phenological characteristics of plants—determine how plants respond to environmental factors, affect other trophic levels, and influence ecosystem properties and their benefits and detriments to people. Plant trait data thus represent the basis for a vast area of research spanning from evolutionary biology, community and functional ecology, to biodivers...
Fertile forests produce biomass more efficientlyNARA Subscribed
Ecology Letters (2012) Abstract Trees with sufficient nutrition are known to allocate carbon preferentially to aboveground plant parts. Our global study of 49 forests revealed an even more fundamental carbon allocation response to nutrient availability: forests with high‐nutrient availability use 58 ± 3% (mean ± SE; 17 forests) of their photosynthates for plant biomass production (BP), while forests with low‐nutrient availabil...
TRY – a global database of plant traitsNARA Subscribed
Plant traits – the morphological, anatomical, physiological, biochemical and phenological characteristics of plants and their organs – determine how primary producers respond to environmental factors, affect other trophic levels, influence ecosystem processes and services and provide a link from species richness to ecosystem functional diversity. Trait data thus represent the raw material for a wide range of research from evol...
The European carbon balance. Part 3: forestsNARA Subscribed
We present a new synthesis, based on a suite of complementary approaches, of the primary production and carbon sink in forests of the 25 member states of the European Union (EU‐25) during 1990–2005. Upscaled terrestrial observations and model‐based approaches agree within 25% on the mean net primary production (NPP) of forests, i.e. 520±75 g C m −2 yr −1 over a forest area of 1.32 × 10 6 km 2 to 1.55 × 10 6 km 2 (EU‐25). New e...
Partitioning net ecosystem carbon exchange and the carbon isotopic disequilibrium in a subalpine forestNARA Subscribed
We investigate the utility of an improved isotopic method to partition the net ecosystem exchange of CO 2 ( F ) into net photosynthesis ( F A ) and nonfoliar respiration ( F R ). Measurements of F and the carbon isotopic content in air at a high‐elevation coniferous forest (the Niwot Ridge AmeriFlux site) were used to partition F into F A and F R . Isotopically partitioned fluxes were then compared with an independent flux par...
CO 2 balance of boreal, temperate, and tropical forests derived from a global databaseNARA Subscribed
Terrestrial ecosystems sequester 2.1 Pg of atmospheric carbon annually. A large amount of the terrestrial sink is realized by forests. However, considerable uncertainties remain regarding the fate of this carbon over both short and long timescales. Relevant data to address these uncertainties are being collected at many sites around the world, but syntheses of these data are still sparse. To facilitate future synthesis activit...
Photosynthesis drives anomalies in net carbon‐exchange of pine forests at different latitudesNARA Subscribed
The growth rate of atmospheric CO 2 exhibits large temporal variation that is largely determined by year‐to‐year fluctuations in land–atmosphere CO 2 fluxes. This land–atmosphere CO 2 ‐flux is driven by large‐scale biomass burning and variation in net ecosystem exchange (NEE). Between‐ and within years, NEE varies due to fluctuations in climate. Studies on climatic influences on inter‐ and intra‐annual variability in gross pho...
Net regional ecosystem CO 2 exchange from airborne and ground‐based eddy covariance, land‐use maps and weather observationsNARA Subscribed
Measurements of regional net ecosystem exchange (NEE) were made over a period of 21 days in summer 2002 in the South‐Central part of the Netherlands and extrapolated to an area of 13 000 km 2 using a combination of flux measurements made by a Sky Arrow ERA research aircraft, half‐hourly eddy covariance data from four towers, half‐hourly weather data recorded by three weather stations and detailed information on regional land u...
The European CARBOEUROPE/FLUXNET monitoring sites, spatial remote sensing observations via the EOS‐MODIS sensor and ecosystem modelling provide independent and complementary views on the effect of the 2003 heatwave on the European biosphere's productivity and carbon balance. In our analysis, these data streams consistently demonstrate a strong negative anomaly of the primary productivity during the summer of 2003. FLUXNET eddy...
Evapotranspiration and soil water content in a scrub‐oak woodland under carbon dioxide enrichmentNARA Subscribed
Leaf conductance often decreases in response to elevated atmospheric CO 2 concentration ( C a ) potentially leading to changes in hydrology. We describe the hydrological responses of Florida scrub oak to elevated C a during an eight‐month period two years after C a manipulation began. Whole‐chamber gas exchange measurements revealed a consistent reduction in evapotranspiration in response to elevated C a , despite an increase...
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