On March 26, 1912, a donation from Japan arrived in Washington, D.C.―3,020 ornamental cherry trees, sparking one of the biggest springtime annual attractions in the […]

The post Washington, D.C.’s Cherry Trees are Very Good at Planning for the Future appeared first on Smithsonian Insider.

A global analysis raises the minimum estimated number of tropical tree species to at least 40,000–53,000 worldwide in a paper appearing in Proceedings of the […]

The post Analysis: Many tropical tree species have yet to be discovered appeared first on Smithsonian Insider.

Ubiquitous as they may be today, the origin of the Christmas tree is unknown to most. The tradition of decorating a tree, usually an evergreen […]

The post Agustín Stahl: Scientist Who Introduced the “Arbol de Navidad” (Christmas Tree) to Puerto Rico appeared first on Smithsonian Insider.

How more than 1,000 tree species may occur in a small area of forest in Amazonia or Borneo is an unsolved mystery. Their ability to […]

The post Trees employ similar strategies to outcompete their neighbors appeared first on Smithsonian Insider.

Internet and phone connections are essential for effective communicators and for success in business. New results from the Smithsonian Tropical Research Institute in Panama show […]

The post Ant bridges connect tropical tree crowns appeared first on Smithsonian Insider.

A newly discovered Hawaiian tree recently had the distinction of being added to the International Union for the Conservation of Nature’s Red List of Critically […]

The post Newly named, Hawaiian tree species already critically endangered appeared first on Smithsonian Insider.

Living trees can rot from the inside out, leaving only a hollowed trunk. Wood rot in living trees can cause overestimates of global carbon pools, […]

The post Measuring trees with the speed of sound appeared first on Smithsonian Insider.

When a mosquito lands and begins to feed, the saliva it deposits in the skin stops blood from coagulating and makes the bite itch. A […]

The post The beautiful and bizarre treehopper appeared first on Smithsonian Insider.

Hidden in plain sight–that’s how researchers describe their discovery of a new genus of large forest tree commonly found, yet previously scientifically unknown, in the […]

The post Remarkable new tree species was “hidden in plain sight” in the Andes appeared first on Smithsonian Insider.

How specific fungi interact with seeds in tropical forest soils may be the ultimate arbiter in the struggle for survival among tropical trees. “Depending on […]

The post Study reveals soil fungi has final say in survival of seeds from tropical trees appeared first on Smithsonian Insider.

Each year from summer into fall, ornamental crape myrtle trees in the southern and central U.S. lay out a visual feast of vibrant flowers in […]

The post Crape myrtle trees aren’t native to the US, but hungry native birds still find them tasty appeared first on Smithsonian Insider.

The impact of polluted urban soil on trees is highlighted in a recent study from Latvia. The researchers found that high salt levels from de-icing chemicals and nutrient imbalance in soil damaged lime trees growing in the city of Riga.

An op-ed in today’s Wall Street Journal questions the conclusions of a National Academies of Sciences, Engineering, and Medicine analysis, issued earlier this year, of a draft of the federal government’s U.S. Global Change Research Program’s Climate Science Special Report (CSSR).

The impact of polluted urban soil on trees is highlighted in a recent study from Latvia. The researchers found that high salt levels from de-icing chemicals and nutrient imbalance in soil damaged lime trees growing in the city of Riga.

Trees form a valuable part of green infrastructure in cities by helping reduce surface water runoff, recent research finds. Together with grassy areas, significant reductions in surface water flows can be achieved by planting trees, reducing the risk of floods.

An early-warning system developed by researchers could help forest managers in Europe predict which trees are at greatest risk of bark- beetle infestation. The study looked at the probability of bark-beetle outbreaks on two important conifer-tree species in Slovenia: the Norway spruce (Picea abies) and silver fir (Abies alba). It found that high temperatures, and extreme weather linked to climate change — including droughts and ice storms — weakened trees, making them more vulnerable to attack by bark beetles.

The discomfort associated with hot, dry summers in some urban areas can be reduced by planting the most appropriate trees in open city spaces, according to a recent study. The researchers identified the Indian laurel fig as the most effective tree for this purpose in the Greek city of Chania.

Trees and other vegetation have an important influence on urban temperatures. To explore these effects, Japanese researchers have built and studied scale models of tree-lined streets. This approach could help designers and planners create urban environments that are cooler during summer months.

Adding compost to compacted urban soils can provide a lasting effect that aids tree growth, new research indicates. Urban soils improved with added organic material are less compacted after five years compared with soils that have not been treated with organic composts, the study suggests.

Doctors prescribe fewer antidepressants in urban areas with more trees on the street, according to recent UK research. The study examined the link between mental health and wellbeing and the presence of trees in London neighbourhoods. Its findings support the idea that maintaining a link to nature, even in an urban area, may help provide a healthy living environment.

‘Dye-sensitised solar cells’ (DSSCs) are an alternative to traditional silicon photovoltaic (PV) cells. They have a number of advantages over traditional PV solar cells, including greater flexibility and lower manufacturing cost, but they are less efficient at turning sunlight into electricity. Taking inspiration from nature, new research has doubled their efficiency using pine tree-shaped nanotubes.

Droughts and temperature rises caused by climate change may already be increasing the die-off of forests, according to a new study. To combat this threat researchers have called for greater knowledge on the status of the forests and the ways in which climate change could have an impact on forest ecosystems.

A recent study has assessed how the choice and cultivation of native and introduced pine tree species affects the impact of insect pests and fungal diseases in Spanish plantations. Native maritime pine trees appeared to be more susceptible to insect attack, whilst non-native Monterey pines were more likely to suffer from fungal attacks. Thinning trees also had differing effects on reducing the effects of pests, depending on the tree species.

A recent study confirms that some European ash trees are more genetically-resistant to the devastating ash dieback disease. These individuals could therefore be selected for gene conservation and/or start a breeding programme to save the European ash.

Climate change will cause widespread biodiversity loss in Europe, but is unlikely to wipe out entire groups of closely related species, according to a new study. The researchers made their predictions using cutting edge modelling techniques to assess the impact of climate change on the "tree of life".

Insect communities are permanently changed by the presence of street lighting, according to new research. The authors of the study found that predatory and scavenging insects such as ants and ground beetles were more common under streetlights at all times of day, suggesting that light pollution does not simply attract different types of animals at night.

Careful choice of tree species and sites could transform plantations into refuges for woodland plant diversity, new research from Ireland suggests. Plantations of native species on or near historic woodland and those with adequate light levels below the tree canopy were found to support more plant species.

Research suggests that climate change could alter the structure and function of temperate peat bogs and that these changes are primarily driven by rising temperatures, rather than periods of temporary drought. An average temperature rise above 1??C could permanently shift moss-covered peat bogs into bogs predominately covered with trees, affecting their ability to store carbon and the existing carbon stocks in them.

Managing urban green spaces to ensure that they have a good mix of tree species, including some older and larger trees, can enhance species diversity of woodland birds, a new study has shown. The study, carried out in Prague, Czech Republic, also showed that the presence of water bodies increased the number of species of woodland birds.

Milder winters under climate change could increase the extent of alder tree (Alnus glutinosa) decline in Europe due to the increased spread of the pathogen Phytophthora alni, a recent study has found. However, this may be offset by hotter summers, which reduce the severity of the disease.

Street lighting reduces the number of moths at ground level and increases flight activity at the level of the lights, shows new research. Less pollen was transported by moths at lit sites in the UK study as a result of the disruptive effects on moth behaviour. The study highlights the need to consider both the direct and indirect ecological impacts of artificial light.

The effect on bats of the replacement of mercury lamps with light-emitting diodes (LEDs) in street lighting has been investigated in a recent study. Artificial light affects bat species differently and the activity of species normally more sensitive to light were affected less by the new LED street lamps than by traditional mercury lamps. Use of LEDs may, therefore, help to reduce the impacts of outdoor lighting on light-sensitive bats, if used at an appropriate level.

The black locust tree can be economically valuable and offer certain environmental benefits, but its dominant and invasive nature in Europe can have an adverse impact on biodiversity. A recent study, which presents an overview of this species’ ecological and socio-economic impacts in Central Europe, recommends tolerating the tree in some areas and eradicating it in others, in order to balance its co-existence with people and nature.

Planting trees in urban areas has been recognised as a cost-effective means of reducing air pollution for several major cities worldwide. In a new study, the impact of tree species diversity on levels of ozone pollution in Rome was assessed. The results suggest that different species of tree complement each other in providing this important ecosystem service.

Planting vegetation in city streets could significantly reduce air pollution in urban street canyons, according to new research. Traffic pollutants are deposited on vegetation at a higher rate than on hard, built surfaces and could reduce the concentration of nitrogen dioxide (NO2) and PM10 in the air by as much as 40% and 60%, respectively, under certain conditions.

Careful planting and pruning is needed to ensure that air pollution in tree-lined streets is minimised, new research suggests. While planting trees in urban areas can have many benefits, such as enhancing biodiversity, trees can trap particulate matter pollution, say the study’s authors.

A recent analysis of tree-ring data spanning the past millennium reveals drought patterns that largely align with climate model projections for the same period. This adds credibility to climate models, which project that human influences on drought patterns will become stronger over the next century.

It may be possible to use trees to monitor levels of air pollution in cities, new research suggests. A Belgian study found evidence that leaves of urban trees change both chemically and physiologically when exposed to different levels of air pollution. If these changes are carefully quantified, trees could provide cheap and widespread ‘bio-indicators’, the study’s authors suggest.

The post Australian and Korean dancers join forces for Seoul Street Arts Festival appeared first on The Lead SA.

The Second World War holds “vivid” memories for David Hays who says it is important for the public to continue to reflect on the sacrifices of our war heroes.

If The Florist is cool and charming, its new downstairs neighbour, Las Iguanas, is all about fun and colour.

SALEM – The gusty winds and heavy rains from the remnants of Hurricane Michael yesterday created flooded roads, downed trees and power lines in western Virginia. As of 11 a.m., approximately 140 roads are closed or affected in the 12 counties of VDOT’s Salem District.   Crews are currently clearing debris and assessing roads throughout the region, coordinating with emergency and utility crews and making or scheduling repairs where possible. In some areas, water will need to recede before a road can be investigated or repaired. Their focus today will be to make roads safe and passable for traffic. If extensive repairs are needed, they will be coordinated and scheduled at a later date.  Drivers are encouraged to continue to monitor road conditions in your area prior to traveling.   The most up-to-date information about flooded roads is available at www.511Virginia.org . For information on specific roads, citizens can access the Road Table under the text views section of the site.  To report downed trees or debris on state maintained roads, citizens can contact VDOT’s customer service center at 1-800-FOR-ROAD.  Drivers who are traveling today are reminded of the following: Turn Around, Don’t Drown! Never drive through water flowing across a road. It takes only six to 12 inches of water to float a small vehicle. Never drive around barricades. Remember, the road has been closed for your safety. Avoid flood-prone areas, especially along creeks and other low-lying areas. Be alert for tree limbs and other debris in the roadway. Even small branches and other debris can damage a car or cause the driver to lose control. If you come across a downed power line, do not try to move it. Contact your local authorities. For updates throughout the day, follow us on Twitter at @VaDOTSalem and @511southwestva  for the latest updates on road conditions.

This file is in PDF format, requiring the Adobe Acrobat Reader to open.

Jonathan Kesselman shares his knowledge of green jobs with others in Times Square.

The engineering mentality based around cars vs. the needs of kids, cyclists and seniors isn't safe for pedestrians. Here are 11 ways to make streets safer.

Amid an uproar from some conservatives, the Obama administration will delay an industry-funded effort to promote real Christmas trees over plastic replicas.