Terrestrial Biomes of the World The study of the distribution of plants is the science of plant geography. The units of vegetation the plant geographers study vary in size from the basic community , to groups of communities and their environment— ecosystems —to assemblages of ecosystems with distinctive vegetation and growth forms that extend over large geographic areas— biomes . Although these three terms each delineate portions of vegetation that occupy space, the terms imply no size per se. A plant community can be the lichens and mosses growing on the bark of a single tree trunk, an acre woodlot, or the plant communities of Yellowstone National Park. So, too, the size of ecosystems varies, although in this case energy flow and nutrient cycling dynamics determine the boundaries of the ecosystem; that is, more reactions occur within the system than
This is the end of the preview.
access the rest of the document.