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Variation in hydraulic vulnerability among tree species in a bottomland hardwood forestNARA Subscribed
Tree hydraulic traits offer useful insights into species- and ecosystem-level responses to droughts, which threaten forests globally. However, hydraulic traits are poorly described in floodplain ecosystems like bottomland hardwood (BLH) forests in the southeastern U.S.A. A tradeoff between flood tolerance and drought tolerance suggests that BLH tree species may have hydraulic traits that make them vulnerable to droughts. To as...
Climate change threatens biodiversity when species cannot tolerate, adapt to, or track shifting environmental conditions to stay within their climatic niches. A major unresolved question is whether and how species' genetic diversity modulates these dynamics, buffering against range contractions or facilitating range expansions. To test this, we integrated the largest global databases of species range shifts and genetic diversi...
Stomatal closure is a pervasive response among trees exposed to flooded soil. We tested whether this response is caused by reduced hydraulic conductance in the soil-to-leaf hydraulic continuum ( k total ), and particularly by reduced root hydraulic conductance ( k root ), which has been widely hypothesized. We tracked stomatal conductance at the leaf level ( g s ) and canopy scale ( G s ) along with physiological conditions in...
Effects of Treated Effluent Discharge on Tree Growth and Water use in a Cypress SwampNARA Subscribed
When municipal effluent is discharged into swamps, baldcypress trees ( Taxodium distichum ) generally respond with increased growth. This growth increase may be associated with increased transpiration (E), but if functional traits are also affected, they may modulate the response of E to environmental conditions such as atmospheric vapor pressure deficit (VPD). We measured tree growth and sap flux to assess water-use traits an...
Leaf turgor loss point varies among tree species, habitats, and seasons in a bottomland hardwood forestNARA Subscribed
Key message Tree species in a temperate floodplain forest had leaf turgor loss point values similar to those of upland forest trees, suggesting physiological drought tolerance in this generally non-water-limited system. Abstract Leaf turgor loss point (TLP) is a key plant trait associated with drought tolerance. In the bottomland hardwood (BLH) forests that grow in floodplains of the southeastern USA, drought stress is general...
The Coastal Carbon Library and Atlas: Open source soil data and tools supporting blue carbon research and policyNARA Subscribed
Quantifying carbon fluxes into and out of coastal soils is critical to meeting greenhouse gas reduction and coastal resiliency goals. Numerous ‘blue carbon’ studies have generated, or benefitted from, synthetic datasets. However, the community those efforts inspired does not have a centralized, standardized database of disaggregated data used to estimate carbon stocks and fluxes. In this paper, we describe a data structure des...
Leaf habit affects the distribution of drought sensitivity but not water transport efficiency in the tropicsNARA Subscribed
Considering the global intensification of aridity in tropical biomes due to climate change, we need to understand what shapes the distribution of drought sensitivity in tropical plants. We conducted a pantropical data synthesis representing 1117 species to test whether xylem‐specific hydraulic conductivity (K S ), water potential at leaf turgor loss (Ψ TLP ) and water potential at 50% loss of K S (Ψ P50 ) varied along climate...
Prolonging survival in good health is a fundamental societal goal. However, the leading determinants of disability-free survival in healthy older people have not been well established. Data from ASPREE, a bi-national placebo-controlled trial of aspirin with 4.7 years median follow-up, was analysed. At enrolment, participants were healthy and without prior cardiovascular events, dementia or persistent physical disability. Disab...
Functional traits offer a rich quantitative framework for developing and testing theories in evolutionary biology, ecology and ecosystem science. However, the potential of functional traits to drive theoretical advances and refine models of global change can only be fully realised when species‐level information is complete. Here we present the AVONET dataset containing comprehensive functional trait data for all birds, includi...
Stomata regulate CO 2 uptake for photosynthesis and water loss through transpiration. The approaches used to represent stomatal conductance ( g s ) in models vary. In particular, current understanding of drivers of the variation in a key parameter in those models, the slope parameter (i.e. a measure of intrinsic plant water‐use‐efficiency), is still limited, particularly in the tropics. Here we collected diurnal measurements o...
Climate and plant trait strategies determine tree carbon allocation to leaves and mediate future forest productivityNARA Subscribed
Forest leaf area has enormous leverage on the carbon cycle because it mediates both forest productivity and resilience to climate extremes. Despite widespread evidence that trees are capable of adjusting to changes in environment across both space and time through modifying carbon allocation to leaves, many vegetation models use fixed carbon allocation schemes independent of environment, which introduces large uncertainties in...