Browsing by Subject "Trees"
Now showing items 1-20 of 26
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Above-ground biomass and structure of 260 African tropical forests.
(Philosophical transactions of the Royal Society of London. Series B, Biological sciences, 2013-01)We report above-ground biomass (AGB), basal area, stem density and wood mass density estimates from 260 sample plots (mean size: 1.2 ha) in intact closed-canopy tropical forests across 12 African countries. Mean AGB is 395.7 ... -
An estimate of the number of tropical tree species.
(Proc Natl Acad Sci U S A, 2015-06-16)The high species richness of tropical forests has long been recognized, yet there remains substantial uncertainty regarding the actual number of tropical tree species. Using a pantropical tree inventory database from closed ... -
Biogeographic analysis of the woody plants of the Southern Appalachians: Implications for the origins of a regional flora.
(Am J Bot, 2015-05)PREMISE OF THE STUDY: We investigated the origins of 252 Southern Appalachian woody species representing 158 clades to analyze larger patterns of biogeographic connectivity around the northern hemisphere. We tested biogeographic ... -
Calibrating single-ended fiber-optic Raman spectra distributed temperature sensing data.
(Sensors (Basel), 2011)Hydrologic research is a very demanding application of fiber-optic distributed temperature sensing (DTS) in terms of precision, accuracy and calibration. The physics behind the most frequently used DTS instruments are considered ... -
Comparative analyses of clinical and environmental populations of Cryptococcus neoformans in Botswana.
(Mol Ecol, 2015-07)Cryptococcus neoformans var. grubii (Cng) is the most common cause of fungal meningitis, and its prevalence is highest in sub-Saharan Africa. Patients become infected by inhaling airborne spores or desiccated yeast cells ... -
Cryptococcus gattii VGIII isolates causing infections in HIV/AIDS patients in Southern California: identification of the local environmental source as arboreal.
(PLoS Pathog, 2014-08)Ongoing Cryptococcus gattii outbreaks in the Western United States and Canada illustrate the impact of environmental reservoirs and both clonal and recombining propagation in driving emergence and expansion of microbial ... -
Deadwood stocks increase with selective logging and large tree frequency in Gabon.
(Glob Chang Biol, 2017-04)Deadwood is a major component of aboveground biomass (AGB) in tropical forests and is important as habitat and for nutrient cycling and carbon storage. With deforestation and degradation taking place throughout the tropics, ... -
Decadal biomass increment in early secondary succession woody ecosystems is increased by CO2 enrichment.
(Nature communications, 2019-02)Increasing atmospheric CO2 stimulates photosynthesis which can increase net primary production (NPP), but at longer timescales may not necessarily increase plant biomass. Here we analyse the four decade-long CO2-enrichment ... -
Dust accumulation in the canopy: a potential cause of dental microwear in primates.
(Am J Phys Anthropol, 1995-06)Dental microwear researchers consider exogenous grit or dust to be an important cause of microscopic wear on primate teeth. No study to date has examined the accumulation of such abrasives on foods eaten by primates in the ... -
Estimating the Impacts of Local Policy Innovation: The Synthetic Control Method Applied to Tropical Deforestation.
(PLoS One, 2015)Quasi-experimental methods increasingly are used to evaluate the impacts of conservation interventions by generating credible estimates of counterfactual baselines. These methods generally require large samples for statistical ... -
Evidence for a Cenozoic radiation of ferns in an angiosperm-dominated canopy.
(Proceedings of the National Academy of Sciences of the United States of America, 2009-07)In today's angiosperm-dominated terrestrial ecosystems, leptosporangiate ferns are truly exceptional--accounting for 80% of the approximately 11,000 nonflowering vascular plant species. Recent studies have shown that this ... -
Four-decade responses of soil trace elements to an aggrading old-field forest: B, Mn, Zn, Cu, and Fe.
(Ecology, 2008-10)In the ancient and acidic Ultisol soils of the Southern Piedmont, USA, we studied changes in trace element biogeochemistry over four decades, a period during which formerly cultivated cotton fields were planted with pine ... -
Hydraulic redistribution of soil water by roots affects whole-stand evapotranspiration and net ecosystem carbon exchange.
(New Phytol, 2010-07)*Hydraulic redistribution (HR) of water via roots from moist to drier portions of the soil occurs in many ecosystems, potentially influencing both water use and carbon assimilation. *By measuring soil water content, sap ... -
Long-term thermal sensitivity of Earth's tropical forests.
(Science (New York, N.Y.), 2020-05-21)The sensitivity of tropical forest carbon to climate is a key uncertainty in predicting global climate change. Although short-term drying and warming are known to affect forests, it is unknown if such effects translate into ... -
Observed change of the standardized precipitation index, its potential cause and implications to future climate change in the Amazon region.
(Philos Trans R Soc Lond B Biol Sci, 2008-05-27)Observations show that the standard precipitation index (SPI) over the southern Amazon region decreased in the period of 1970-1999 by 0.32 per decade, indicating an increase in dry conditions. Simulations of constant ... -
Oil and gas projects in the Western Amazon: threats to wilderness, biodiversity, and indigenous peoples.
(PLoS One, 2008-08-13)BACKGROUND: The western Amazon is the most biologically rich part of the Amazon basin and is home to a great diversity of indigenous ethnic groups, including some of the world's last uncontacted peoples living in voluntary ... -
Organic nitrogen enhances nitrogen nutrition and early growth of Pinus sylvestris seedlings.
(Tree physiology, 2022-03)Boreal trees are capable of taking up organic nitrogen (N) as effectively as inorganic N. Depending on the abundance of soil N forms, plants may adjust physiological and morphological traits to optimize N uptake. However, ... -
Planning a Sustainable Tree Canopy for Durham
(2020-04-24)Trees are a vital part of a city’s infrastructure. The urban forest provides many ecosystem services to residents including health benefits, air pollution removal, extreme heat reduction, stormwater mitigation, and even ... -
Quantitative analysis of forest fragmentation in the atlantic forest reveals more threatened bird species than the current red list.
(PloS one, 2013-01)Habitat loss and attendant fragmentation threaten the existence of many species. Conserving these species requires a straightforward and objective method that quantifies how these factors affect their survival. Therefore, ...
