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Terrestrial ecosystems occupy 55,660,000 mi 2 (144,150,000 km 2), or 28.26% of Earth's surface. [5] Major plant taxa in terrestrial ecosystems are members of the division Magnoliophyta (flowering plants), of which there are about 275,000 species, and the division Pinophyta (conifers), of which there are about 500 species.
Ecosystem ecology is philosophically and historically rooted in terrestrial ecology. The ecosystem concept has evolved rapidly during the last 100 years with important ideas developed by Frederic Clements, a botanist who argued for specific definitions of ecosystems and that physiological processes were responsible for their development and persistence. [2]
An ecosystem (or ecological system) is a system formed by organisms in interaction with their environment. [2]: 458 The biotic and abiotic components are linked together through nutrient cycles and energy flows.
The Science Education Resource Center, Carleton College, offers the following description: "Earth System science embraces chemistry, physics, biology, mathematics and applied sciences in transcending disciplinary boundaries to treat the Earth as an integrated system.
Ecosystem services or eco-services are defined as the goods and services provided by ecosystems to humans. [3] Per the 2006 Millennium Ecosystem Assessment (MA), ecosystem services are "the benefits people obtain from ecosystems".
The Tehuacán-Cuicatlán biosphere reserve is a protected natural area located in southeastern Mexico. Its name derives from its two main locations: Cuicatlán and Tehuacán, in the latter are their administrative offices, covers 490,186 hectares distributed among 21 municipalities in the state of Puebla and Oaxaca.
The park was created by Law 409 enacted June 3, 1976. It was preceded by a Reserva Forestal (Forest Reserve) called Zona Vedada de Los Haitises (Los Haitises Prohibited Zone), created by Law 244. In 1996, its area was expanded from 208 to 826 km 2 (80 to 319 sq mi) by Decree 233. Its boundary, which has been redrawn on several occasions, is ...
The Sistema Ibérico mountain range borders the Meseta Central on its eastern end and separates the Meseta Central from the Ebro valley and from the Mediterranean coast.. This system runs northwest-southeast between the Ebro plain and the Meseta Central for over 500 km, from the La Bureba corridor in Burgos Province close to the Cordillera Cantábrica to the Mediterranean sea close to Valencia ...