Trees are an important component of the natural landscape because of their prevention of erosion and the provision of a weather-sheltered ecosystem in and under their foliage. Trees also play an important role in producing oxygen and reducing carbon dioxide in the atmosphere, as well as moderating ground temperatures. They are also elements in landscaping and agriculture, both for their aesthetic appeal and their orchard crops (such as apples). Wood from trees is a building material, as well as a primary energy source in many developing countries. Trees also play a role in many of the world's mythologies (see trees in mythology).
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Men In Trees: Blogs In Trees
This was my first script for "Men In Trees," so therefore, my first blog. ... Our First Blog of Season Two!!! Hey, tree huggers ...blogs.abc.com/blogsintrees/Tree Blog
how to keep the trees healthy, and why to plant this variety ... Podcast Stockton. Tree Blog is proudly powered by WordPress. Entries (RSS) and Comments (RSS) ...trees.savestockton.org/blog/Dallas Trees
Dallas Trees. Welcome to Phil Erwin's personal blog on Dallas, Texas forestry. ... What Do You Think Of This Blog? Ask An Arborist. An Introduction To Dallas Trees ...dallastrees.blogspot.com/These Come From Trees Blog
These Come From Trees Blog. Welcome to the world's first guerrilla public service announcement! ... has her blog, which helped These Come From Trees when she ...thesecomefromtrees.blogspot.com/Men In Trees: Blogs In Trees
Hey Elmoians! Sorry for the very long wait for this next blog entry. ... Men In Trees: Blogs In Trees " Okay, here's the deal...blogs.abc.com/blogsintrees/2007/06/were_baaaackkk.html
Trees are an important component of the natural landscape because of their prevention of erosion and the provision of a weather-sheltered ecosystem in and under their foliage. Trees also play an important role in producing oxygen and reducing carbon dioxide in the atmosphere, as well as moderating ground temperatures. They are also elements in landscaping and agriculture, both for their aesthetic appeal and their orchard crops (such as apples). Wood from trees is a building material, as well as a primary energy source in many developing countries. Trees also play a role in many of the world's mythologies (see trees in mythology).
Classification
The tree form has evolved separately in unrelated classes of plants, in response to similar environmental challenges, making it a classic example of parallel evolution. With an estimate of 100,000 tree species, the number of tree species worldwide might total 25 percent of all living plant species. The majority of tree species grow in tropical regions of the world and many of these areas have not been surveyed yet by botanists, making species diversity and ranges poorly understood.
The earliest trees were tree ferns and horsetails, which grew in forests in the Carboniferous Period; tree ferns still survive, but the only surviving horsetails are not of tree form. Later, in the Triassic Period, conifers, ginkgos, cycads and other gymnosperms appeared, and subsequently flowering plants in the Cretaceous Period. Most species of trees today are flowering plants (Angiosperms) and conifers. The listing below gives examples of well-known trees and how they are classified.
A small group of trees growing together is called a grove or copse, and a landscape covered by a dense growth of trees is called a forest. Several biotopes are defined largely by the trees that inhabit them; examples are rainforest and taiga (see ecozones). A landscape of trees scattered or spaced across grassland (usually grazed or burned over periodically) is called a savanna. A forest of great age is called old growth forest or ancient woodland (in the UK). A young tree is called a sapling.
Morphology
