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tree : a woody perennial plant having a single usually elongate main stem generally with few or no branches on its lower part — Webster
Tree is a perennial plant with an elongated stem, or trunk, supporting branches and leaves in most species. In some usages, the definition of a tree may be narrower, including only woody plants with secondary growth, plants that are usable as lumber or plants above a specified height. Trees are not a taxonomic group but include a variety of plant species that have independently evolved a woody trunk and branches as a way to tower above other plants to compete for sunlight. In looser senses, the taller palms, the tree ferns, bananas and bamboos are also trees. Trees tend to be long-lived, some reaching several thousand years old. The tallest known tree, a coast redwood named Hyperion, stands 115.6 m (379 ft) high. Trees have been in existence for 370 million years. — Wikipedia
Trees News -- ScienceDaily Read all about trees, including the latest research on many tree species, insect infestations, and the role of trees in ecology. Full articles, photos, free.
Drier conditions could doom Rocky Mountain spruce...
on February 22, 2018 at 5:57 pm
Drier summers and a decline in average snowpack over the past 40 years have severely hampered the establishment of two foundational tree species in subalpine regions of Colorado's Front Range, suggesting that climate warming is already taking a toll on forest health in some areas of the southern Rocky Mountains. […]
Tropical trees use unique method to resist drought
on February 21, 2018 at 7:09 pm
Tropical trees in the Amazon Rainforest may be more drought resistant than previously thought, according to a new study. That's good news, since the Amazon stores about 20 percent of all carbon in the Earth's biomass, which helps reduce global warming by lowering the planet's greenhouse gas levels. […]
Birds and beans: Study shows best coffee for bird...
on February 16, 2018 at 1:48 pm
It's an age-old debate for coffee lovers. Which is better: Arabica beans with their sweeter, softer taste, or the bold, deep flavor of Robusta beans? A new study has taken the question to unlikely coffee aficionados: birds. […]
At last, butterflies get a bigger, better...
on February 15, 2018 at 8:39 pm
Butterflies offer key insights into community ecology, how species originate and evolve, climate change and interactions between plants and insects. But a comprehensive map of how butterflies are related to each other has been lacking -- until now. […]
Hunting is changing forests, but not as expected
on February 15, 2018 at 5:50 pm
In many tropical forests, over-hunting is diminishing the populations of animals who are vital for dispersing the seeds of woody plants. Those same plants are vital for carbon storage and previous theoretical modeling studies predicted dire consequences to defaunation, this research suggests otherwise. Instead the data shows the effects on the ecosystem are less straightforward and less immediately devastating. […]