Plant ecologyis a subdiscipline ofecologywhich studies the distribution andabundanceofplants, the effects of environmental factors upon the abundance of plants, and the interactions among and between plants and other organisms.[1]Examples of these are the distribution oftemperate deciduous forestsin North America, the effects of drought or flooding upon plant survival, and competition among desert plants forwater, or effects of herds of grazing animals upon the composition of grasslands.A global overview of the Earth's major vegetation types is provided by O.W. Archibold.[2]He recognizes 11 major vegetation types: tropical forests, tropical savannas, arid regions (deserts), Mediterranean ecosystems, temperate forest ecosystems, temperate grasslands, coniferous forests, tundra (both polar and high mountain), terrestrialwetlands, freshwater ecosystems and coastal/marine systems. This breadth of topics shows the complexity of plant ecology, since it includes plants from floating single-celled algae up to large canopy forming trees.One feature that defines plants is photosynthesis.One of the most important aspects of plant ecology is the role plants have played increating the oxygenated atmosphere of earth, an event that occurred some 2 billion years ago. It can be dated by the deposition of banded iron formations, distinctive sedimentary rocks with large amounts of iron oxide. At the same time, plants began removing carbon dioxide from the atmosphere, thereby initiating the process of controlling Earth's climate. A long term trend of the Earth has been toward increasing oxygen and decreasing carbon dioxide, and many other events in the Earths history, like the first movement of life onto land, are likely tied to this sequence of events.Plant ecology can also be divided by levels of organization including plantecophysiology, plantpopulation ecology,community ecology,ecosystem ecology,landscape ecologyand biosphere ecology . it is a very beautiful green color plant......
