28 Result(s)
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Article
Michael Köhl
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Open AccessIntegrated global assessment of the natural forest carbon potential
Forests are a substantial terrestrial carbon sink, but anthropogenic changes in land use and climate have considerably reduced the scale of this system1. Remote-sensing estimates to quantify carbon losses from gl...
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Open AccessThe global biogeography of tree leaf form and habit
Understanding what controls global leaf type variation in trees is crucial for comprehending their role in terrestrial ecosystems, including carbon, water and nutrient dynamics. Yet our understanding of the fa...
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Open AccessAuthor Correction: Native diversity buffers against severity of non-native tree invasions
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Open AccessNative diversity buffers against severity of non-native tree invasions
Determining the drivers of non-native plant invasions is critical for managing native ecosystems and limiting the spread of invasive species1,2. Tree invasions in particular have been relatively overlooked, even ...
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Ensure forest-data integrity for climate change studies
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Open AccessUsing Utilitarian Plants for Lemur Conservation
Nature and species conservation often conflict with intensive natural resource or land use. Many protected areas are too small for long-term conservation of viable vertebrate populations, especially in Madagas...
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Open AccessDeterministic spin-photon entanglement from a trapped ion in a fiber Fabry–Perot cavity
The development of efficient network nodes is a key element for the realization of quantum networks which promise great capabilities as distributed quantum computing or provable secure communication. We report...
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Competing magnetic orders in a bilayer Hubbard model with ultracold atoms
Fermionic atoms in optical lattices have served as a useful model system in which to study and emulate the physics of strongly correlated matter. Driven by the advances of high-resolution microscopy, the curre...
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Open AccessCarbon recovery following selective logging in tropical rainforests in Kalimantan, Indonesia
The knowledge gap regarding post-logging carbon recovery by increased growth is becoming more crucial to understand the significant contribution of forest to climate change mitigation. We assessed the ability ...
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Monolayer graphene as dissipative membrane in an optical resonator
We experimentally demonstrate coupling of an atomically thin, free-standing graphene membrane to an optical cavity. By changing the position of the membrane along the standing-wave field of the cavity, we tail...
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Open AccessHarvested wood products and REDD+: looking beyond the forest border
The focus of REDD+ is sensu stricto on maintaining forest carbon stocks. We extend the scope of sustainable management of forest from forests to timber utilization, and study carbon offsets resulting from the ...
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Open AccessModeling the CO2-effects of forest management and wood usage on a regional basis
At the 15th Conference of Parties of the UN Framework Convention on Climate Change, Copenhagen, 2009, harvested wood products were identified as an additional carbon pool. This modification eliminates inconsisten...
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Open AccessAvoiding treatment bias of REDD+ monitoring by sampling with partial replacement
Implementing REDD+ renders the development of a measurement, reporting and verification (MRV) system necessary to monitor carbon stock changes. MRV systems generally apply a combination of remote sensing techn...
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Error propagation in stock-difference and gain–loss estimates of a forest biomass carbon balance
According to the United Nations International Panel on Climate Change good practice guidance, an annual forest biomass carbon balance (AFCB) can be estimated by either the stock-difference (SD) or the gain–lo...
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Correction: Corrigendum: Universal spin dynamics in two-dimensional Fermi gases
Nature Phys. 9, 405–409 (2013); published online 26 May 2013; corrected online 4 June 2013; corrected after print 23 December 2013 In the version of this Letter originally published, the stated value for the d...
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Universal spin dynamics in two-dimensional Fermi gases
Experiments with ultracold atomic gases can provide insight into more general phenomena, such as spin transport. A study of spin diffusion in a two-dimensional Fermi gas measured the lowest spin diffusion cons...
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Open AccessThe global climate change mitigation strategy REDD: monitoring costs and uncertainties jeopardize economic benefits
REDD (Reducing Emissions from Deforestation and Forest Degradation) has been suggested as a climate change mitigation strategy that is based on the philosophy to reward countries for reducing their deforestati...
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Controlling chemical reactions of a single particle
Chemical reactions between a single trapped ion and a condensate of ultracold neutral atoms are investigated by controlling the quantum states of both ion and atoms—revealing the effect of the hyperfine intera...
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Attractive and repulsive Fermi polarons in two dimensions
Investigations of a two-dimensional spin-imbalanced Fermi gas reveal the existence of the Fermi polaron for attractive and repulsive interactions, and the transition from the attractive polaron to a molecule.
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Observation of a pairing pseudogap in a two-dimensional Fermi gas
Observation of a many-body pairing gap in a trapped, 2D atomic Fermi gas shows that ultracold atomic gases can be used to emulate the physics of correlated 2D superconductors, with the ultimate goal of underst...
