gross primary productivity
1gross primary productivity — the addition, through photosynthesis, of organic matter in plants measured in dry grammes per square metre per year …
2Primary production — For other uses, see Primary production (economics). Global oceanic and terrestrial photoautotroph abundance, from September 1997 to August 2000. As an estimate of autotroph biomass, it is only a rough indicator of primary production potential,… …
3productivity — pro·duc·tiv·i·ty (prō dŭk tĭvʹĭ tē, prŏd ək ) n. 1. The quality of being productive. 2. Economics. The rate at which goods or services are produced especially output per unit of labor. 3. Ecology. The rate at which radiant energy is used by… …
4Gross domestic product — GDP redirects here. For other uses, see GDP (disambiguation). Not to be confused with Gross national product or Gross domestic income. CIA World Factbook 2005 figures of total nominal GDP (top) compared to PPP adjusted GDP (bottom) …
5Glossary of environmental science — This is a glossary of environmental science.Environmental science is the study of interactions among physical, chemical, and biological components of the environment. Environmental science provides an integrated, quantitative, and… …
6tropical rainforest — Introduction also spelled tropical rain forest luxuriant forest, generally composed of broad leaved trees and found in wet tropical uplands and lowlands around the Equator. Rainforests are vegetation types dominated by broad leaved trees …
7biosphere — biospheric /buy euh sfer ik/, adj. /buy euh sfear /, n. 1. the part of the earth s crust, waters, and atmosphere that supports life. 2. the ecosystem comprising the entire earth and the living organisms that inhabit it. [1895 1900; < G Biosphäre; …
8temperate forest — ▪ ecology Introduction vegetation type with a more or less continuous canopy of broad leaved trees. Such forests occur between approximately 25° and 50° latitude in both hemispheres (seeFigure 1 >). Toward the polar regions they grade into… …
9Ecosystem ecology — Figure 1. A riparian forest in the White Mountains, New Hampshire (USA). Ecosystem ecology is the integrated study of biotic and abiotic components of ecosystems and their interactions within an ecosystem framework. This science examines how… …
10marine ecosystem — Introduction complex of living organisms in the ocean environment. Marine waters cover two thirds of the surface of the Earth. In some places the ocean is deeper than Mount Everest is high; for example, the Mariana Trench and the… …
