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| Open AccessConsistent patterns of common species across tropical tree communities
Inventory data from more than 1 million trees across African, Amazonian and Southeast Asian tropical forests suggests that, despite their high diversity, just 1,053 species, representing a consistent ~2.2% of tropical tree species in each region, constitute half of Earth’s 800 billion tropical trees.
- Declan L. M. Cooper
- , Simon L. Lewis
- & Stanford Zent
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Article
| Open AccessIntegrated global assessment of the natural forest carbon potential
Analysis of ground-sourced and satellite-derived models reveals a global forest carbon potential of 226 Gt outside agricultural and urban lands, with a difference of only 12% across these modelling approaches.
- Lidong Mo
- , Constantin M. Zohner
- & Thomas W. Crowther
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Article
| Open AccessNative diversity buffers against severity of non-native tree invasions
Analysis combining multiple global tree databases reveals that whether a location is invaded by non-native tree species depends on anthropogenic factors, but the severity of the invasion depends on the native species diversity.
- Camille S. Delavaux
- , Thomas W. Crowther
- & Daniel S. Maynard
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Article
| Open AccessBasin-wide variation in tree hydraulic safety margins predicts the carbon balance of Amazon forests
A pan-Amazon study of forests shows large variations in drought tolerance traits and finds that forests in regions of pronounced climate change are losing biomass and may be operating beyond their hydraulic limits.
- Julia Valentim Tavares
- , Rafael S. Oliveira
- & David R. Galbraith
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Article |
Tree diversity increases decadal forest soil carbon and nitrogen accrual
Analysis of data from the Canadian National Forest Inventory database suggests that greater tree diversity in natural forests is associated with increases in soil carbon and nitrogen stocks.
- Xinli Chen
- , Anthony R. Taylor
- & Scott X. Chang
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Article |
Effects of moisture and density-dependent interactions on tropical tree diversity
Moist soil strengthens density-dependent mortality with long-lasting effects on species diversity of tropical trees.
- Edwin Lebrija-Trejos
- , Andrés Hernández
- & S. Joseph Wright
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Article
| Open AccessLogged tropical forests have amplified and diverse ecosystem energetics
Logged forests in Borneo have higher energy flow from vegetation to and broad range of bird and mammal species relative to old-growth forests and oil palm plantations, showing that they can be diverse and ecologically vibrant ecosystems.
- Yadvinder Malhi
- , Terhi Riutta
- & Matthew J. Struebig
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Article |
Widespread herbivory cost in tropical nitrogen-fixing tree species
Nitrogen-fixing trees are favoured by herbivorous animals relative to non-fixing trees, increasing their carbon opportunity cost and potentially constraining global nitrogen fixation.
- Will Barker
- , Liza S. Comita
- & Sarah A. Batterman
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Article |
Warm springs alter timing but not total growth of temperate deciduous trees
Warmer spring temperatures affect the timing of stem diameter growth of temperate deciduous trees but have little effect on annual growth.
- Cameron Dow
- , Albert Y. Kim
- & Kristina J. Anderson-Teixeira
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Article
| Open AccessSufficient conditions for rapid range expansion of a boreal conifer
A boreal conifer is advancing northwards into Arctic tundra, with this treeline advance facilitated by climate warming together with winter winds, deeper snow and increased soil nutrient availability.
- Roman J. Dial
- , Colin T. Maher
- & Patrick F. Sullivan
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Article |
Tropical tree mortality has increased with rising atmospheric water stress
Over the past 35 years, annual tree mortality risk has increased in the moist tropical forests of Australia and is associated with increased atmospheric water stress.
- David Bauman
- , Claire Fortunel
- & Sean M. McMahon
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Article |
Widespread woody plant use of water stored in bedrock
Woody plants across the continental United States make extensive use of water stored in bedrock across diverse climates and biomes.
- Erica L. McCormick
- , David N. Dralle
- & Daniella M. Rempe
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Article |
The contribution of insects to global forest deadwood decomposition
Multi-year field experiments across six continents suggest that insects have an important contribution to decomposition and carbon release from forest deadwood.
- Sebastian Seibold
- , Werner Rammer
- & Jörg Müller
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Article |
High aboveground carbon stock of African tropical montane forests
The aboveground carbon stock of a montane African forest network is comparable to that of a lowland African forest network and two-thirds higher than default values for these montane forests.
- Aida Cuni-Sanchez
- , Martin J. P. Sullivan
- & Etienne Zibera
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Article |
Unveiling African rainforest composition and vulnerability to global change
A large dataset of 6 million trees from 193 taxa is used to map the floristic and functional composition of central African forests and predict their vulnerability to climate change.
- Maxime Réjou-Méchain
- , Frédéric Mortier
- & Sylvie Gourlet-Fleury
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Article |
Soil carbon loss by experimental warming in a tropical forest
When tropical forest soils are warmed in situ, they release more CO2 than predicted by theory, creating a potentially substantial positive feedback to climate change.
- Andrew T. Nottingham
- , Patrick Meir
- & Benjamin L. Turner
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Article |
The fate of carbon in a mature forest under carbon dioxide enrichment
Carbon dioxide enrichment of a mature forest resulted in the emission of the excess carbon back into the atmosphere via enhanced ecosystem respiration, suggesting that mature forests may be limited in their capacity to mitigate climate change.
- Mingkai Jiang
- , Belinda E. Medlyn
- & David S. Ellsworth
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Article |
Asynchronous carbon sink saturation in African and Amazonian tropical forests
Unlike Amazonian forests, African forests have maintained their carbon sink until recently but by 2030 the African carbon sink will have shrunk by 14 per cent and the Amazonian sink will reach almost zero.
- Wannes Hubau
- , Simon L. Lewis
- & Lise Zemagho
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Article |
Arthropod decline in grasslands and forests is associated with landscape-level drivers
Analyses of a dataset of arthropod biomass, abundance and diversity in grassland and forest habitats in Germany for the period 2008–2017 reveal that drivers of arthropod declines act at the landscape level.
- Sebastian Seibold
- , Martin M. Gossner
- & Wolfgang W. Weisser
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Letter |
Increasing wildfires threaten historic carbon sink of boreal forest soils
Soil radiocarbon dating reveals that combusted ‘legacy carbon’—soil carbon that escaped burning during previous fires—could shift the carbon balance of boreal ecosystems, resulting in a positive climate feedback.
- Xanthe J. Walker
- , Jennifer L. Baltzer
- & Michelle C. Mack
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Letter |
Climatic controls of decomposition drive the global biogeography of forest-tree symbioses
A spatially explicit global map of tree symbioses with nitrogen-fixing bacteria and mycorrhizal fungi reveals that climate variables are the primary drivers of the distribution of different types of symbiosis.
- B. S. Steidinger
- , T. W. Crowther
- & Irie Casimir Zo-Bi
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Letter |
Hydraulic diversity of forests regulates ecosystem resilience during drought
The diversity in the hydraulic traits of trees mediates ecosystem resilience to drought and will probably have an important role in future ecosystem–atmosphere feedback effects.
- William R. L. Anderegg
- , Alexandra G. Konings
- & Nicole Zenes
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Article |
Environment and host as large-scale controls of ectomycorrhizal fungi
Analyses of data from 137 forest plots across 20 European countries show that ectomycorrhizal fungal diversity is strongly influenced by environmental and host species factors and provide thresholds to inform ecosystem assessment tools
- Sietse van der Linde
- , Laura M. Suz
- & Martin I. Bidartondo
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Letter |
Shifts in tree functional composition amplify the response of forest biomass to climate
Forest inventory data from the 1980s and 2000s show the response of eastern USA forests to climate variability; direct effects of climate on forest biomass are amplified by changes in tree species composition.
- Tao Zhang
- , Ülo Niinemets
- & Jeremy W. Lichstein
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Letter |
Global patterns of tropical forest fragmentation
Satellite data and modelling reveal that tropical forest fragments have similar size distributions across continents, and that forest fragmentation is close to a critical point, beyond which fragment numbers will strongly increase.
- Franziska Taubert
- , Rico Fischer
- & Andreas Huth
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Article |
Creation of forest edges has a global impact on forest vertebrates
Fragmentation of forest ecosystems produces forest edges, which affect the distribution of many analysed vertebrate species; smaller-bodied amphibians, larger reptiles and medium-sized mammals experience a larger reduction in suitable habitat than other forest-core species.
- M. Pfeifer
- , V. Lefebvre
- & R. M. Ewers
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Letter |
Age, extent and carbon storage of the central Congo Basin peatland complex
Field measurements combined with remotely sensed data reveal the Cuvette Centrale in the central Congo Basin to contain the most extensive peatland complex in the tropics, increasing the best estimate of global tropical peatland carbon stocks by approximately one-third.
- Greta C. Dargie
- , Simon L. Lewis
- & Suspense A. Ifo
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Letter |
Seasonality of temperate forest photosynthesis and daytime respiration
Climate models require an understanding of ecosystem-scale respiration and photosynthesis, yet there is no way of measuring these two fluxes directly; here, new instrumentation is used to determine these fluxes in a temperate forest, showing, for instance, that respiration is less during the day than at night.
- R. Wehr
- , J. W. Munger
- & S. R. Saleska
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Letter |
Anthropogenic disturbance in tropical forests can double biodiversity loss from deforestation
Evaluation of the primary forests in the Brazilian state of Pará shows that anthropogenic disturbance can more than double the loss of biodiversity expected from deforestation.
- Jos Barlow
- , Gareth D. Lennox
- & Toby A. Gardner
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Letter |
Biomass resilience of Neotropical secondary forests
An analysis of above-ground biomass recovery during secondary succession in forest sites and plots, covering the major environmental gradients in the Neotropics.
- Lourens Poorter
- , Frans Bongers
- & Danaë M. A. Rozendaal
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Letter |
Plant functional traits have globally consistent effects on competition
Data from millions of trees in thousands of locations are used to show that certain key traits affect competitive ability in predictable ways, and that there are trade-offs between traits that favour growth with and without competition.
- Georges Kunstler
- , Daniel Falster
- & Mark Westoby
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Article |
Mapping tree density at a global scale
Ground-sourced tree density data is assembled to provide a global map of tree density, which reveals that there are three trillion trees (tenfold more than previous estimates); tree numbers have declined by nearly half since the start of human civilization and over 15 billion trees are lost on an annual basis.
- T. W. Crowther
- , H. B. Glick
- & M. A. Bradford
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Letter |
Long-term decline of the Amazon carbon sink
The capacity of Amazonian forests to sequester carbon has weakened with potentially important implications for climate change.
- R. J. W. Brienen
- , O. L. Phillips
- & R. J. Zagt
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Letter |
Amazon forests maintain consistent canopy structure and greenness during the dry season
Lidar and optical satellite observations of Amazon forests indicate consistent canopy structure and reflectance during the dry season, challenging the paradigm of light-limited tropical forest productivity.
- Douglas C. Morton
- , Jyoteshwar Nagol
- & Peter R. J. North
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Letter |
Pathogens and insect herbivores drive rainforest plant diversity and composition
Suppressing fungi in a tropical forest plant community lowers diversity by reducing the negative effects of density on seedling recruitment, and removing insects increases seedling survival and alters plant community composition; this demonstrates the crucial role of pathogens and insects in maintaining and structuring tropical forest plant diversity.
- Robert Bagchi
- , Rachel E. Gallery
- & Owen T. Lewis
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Letter |
Rate of tree carbon accumulation increases continuously with tree size
A global analysis shows that for most tree species the largest trees are the fastest-growing trees, a finding that resolves conflicting assumptions about tree growth and that has implications for understanding forest carbon dynamics, resource allocation trade-offs within trees and plant senescence.
- N. L. Stephenson
- , A. J. Das
- & M. A. Zavala
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Letter |
Increase in forest water-use efficiency as atmospheric carbon dioxide concentrations rise
Present-day forests use water more efficiently, probably owing to the effect of increased atmospheric carbon dioxide on leaf stomata, which partially close to maintain a near-constant level of carbon dioxide inside the leaves despite increasing atmospheric levels.
- Trevor F. Keenan
- , David Y. Hollinger
- & Andrew D. Richardson
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News |
Severe drought has lasting effects on Amazon
Satellite data reveal effects of climate change on tropical forests.
- Hannah Hoag
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Correspondence |
Tightening up on tree carbon estimates
- Rosa C. Goodman
- , Oliver L. Phillips
- & Timothy R. Baker
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News & Views |
Forests on the brink
An analysis of the physiological vulnerability of different trees to drought shows that forests around the globe are at equally high risk of succumbing to increases in drought conditions. See Letter p.752
- Bettina M. J. Engelbrecht
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Letter |
Global convergence in the vulnerability of forests to drought
Analysis of data from forest plants worldwide shows that margins between threshold xylem pressures at which plants suffer damage and the lowest xylem pressures experienced are small, with no difference between dry and wet forests, providing insight into why drought-induced forest decline is occurring in both arid and wet forests.
- Brendan Choat
- , Steven Jansen
- & Amy E. Zanne
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Correspondence |
Citizens add to satellite forest maps
- Marijn van der Velde
- , Linda See
- & Steffen Fritz
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News Feature |
Forest fires: Burn out
Forests in the American west are under attack from giant fires, climate change and insect outbreaks. Some ecosystems will never be the same.
- Michelle Nijhuis
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News & Views |
Drought and tropical soil emissions
Past research implied that positive feedback might exist between climate change and greenhouse-gas emissions from soil. A study finds that drought-induced declines in such emissions from tropical forests could counter climate change.
- Cory C. Cleveland
- & Benjamin W. Sullivan
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News |
India’s forest area in doubt
Reliance on satellite data blamed for over-optimistic estimates of forest cover.
- Natasha Gilbert
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News |
Brazil unveils tool to track emissions
Carbon releases lag behind Amazon deforestation.
- Jeff Tollefson
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News |
Brazil's Atlantic forests lose key species
Survey reveals that local extinctions of large mammals are far worse than predicted.
- Claudio Angelo
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Letter |
Averting biodiversity collapse in tropical forest protected areas
Analysis of changes in functional groups of species and potential drivers of environmental change for protected areas across the world’s major tropical regions reveals large variation between reserves that have been effective and those experiencing an erosion of biodiversity, and shows that environmental changes immediately outside reserves are nearly as important as those inside in determining their ecological fate.
- William F. Laurance
- , D. Carolina Useche
- & Franky Zamzani
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News |
Amazon's extinction debt still to be paid
Current species losses are just the tip of the iceberg.
- Helen Thompson