
	Where results make sense

Topic: Biogeochemical cycle

Related Topics

Carbon cycle

Water cycle

Nitrogen cycle

Hydrology

Water resources

Ecosystem

Nitrogen fixation

Nitrogenase

Ecology

Carbon

Nitrogen

Edge effect

Phosphate

Biosphere

Ammonium

In the News (Fri 27 Nov 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	Nitrogen Cycles Project: 2. Biogeochemical Cycle
		The term biogeochemical cycles expresses the interactions among the organic (bio-) and inorganic (geo-) worlds, and focuses on the chemistry (chemical-), and movement (cycles) of chemical elements and compounds.
		In studying biogeochemical cycles, it is important to express in a common unit the amount of each element in all its phases and all its chemical compounds.
		Sprent, J.I. The Ecology of the Nitrogen Cycle.
	www.sws.uiuc.edu /nitro/biogen.asp (860 words)

	Biogeochemical cycle - Wikipedia, the free encyclopedia
		In ecology and Earth science, a biogeochemical cycle is a circuit or pathway by which a chemical element or molecule moves through both biotic ("bio-") and abiotic ("geo-") compartments of an ecosystem.
		The most well-known and important biogeochemical cycles, for example, include the carbon cycle, the nitrogen cycle, the oxygen cycle, the phosphorus cycle, and the water cycle.
		Biogeochemical cycles always involve equilibrium states: a balance in the cycling of the element between compartments.
	en.wikipedia.org /wiki/Biogeochemical_cycle (844 words)

	Life and Biogeochemical Cycles
		Both the hydrological and sedimentary cycles are intertwined with the distribution of the amounts and flows of six important elements - hydrogen, carbon, oxygen, nitrogen, phosphorus, and sulfur.
		Another example of a major biogeochemical cycle of significance to climate and life is the sulfur cycle.
		The carbon cycle includes four main reservoirs of stored carbon: as CO2 in the atmosphere; as organic compounds in living or recently dead organisms; as dissolved carbon dioxide in the oceans and other bodies of water; and as calcium carbonate in limestone and in buried organic matter (e.g.
	essp.csumb.edu /esse/climate/climatebiogeo.html (2017 words)

	Global Biogeochemical Cycles and the Physical Climate System - Fred T. Mackenzie
		Emphasis is on the biogeochemical cycles of atmospheric carbon dioxide and oxygen through the past 600 million years of the history of the earth.
		Figures 9, 10, 11 illustrate the biogeochemical cycles of methane (CH), carbon monoxide (CO), and carbon dioxide between the earth's surface and atmosphere.
		The difference between the two amounts implies that the ocean, prior to human interference in the global biogeochemical cycle of carbon, was a net heterotrophic system and supplied CO to the atmosphere.
	www.dpc.ucar.edu /globalChange/m4bgchem/m4html.html (14145 words)

	EO Library: The Carbon Cycle
		On Earth, carbon cycles through the land, ocean, atmosphere, and the Earth’s interior in a major biogeochemical cycle (the circulation of chemical components through the biosphere from or to the lithosphere, atmosphere, and hydrosphere).
		The global carbon cycle can be divided into two categories: the geological, which operates over large time scales (millions of years), and the biological/physical, which operates at shorter time scales (days to thousands of years).
		The cycle continues as these materials are drawn into Earth’s mantle by subduction (a process in which one lithospheric plate descends beneath another, often as a result of folding or faulting) at the edges of continental plates.
	eobglossary.gsfc.nasa.gov /Library/CarbonCycle/index.html (583 words)

	The Environmental Literacy Council - Biogeochemical Cycles
		Humans accelerate natural biogeochemical cycles when elements are extracted from their reservoirs, or sources, and deposited back into the environment (sinks).
		For example, humans have significantly altered the carbon cycle by extracting and combusting billions of tons of hydrocarbons in fossil that were buried deep in the Earth's crust, in addition to clearing vegetation that stores carbon.
		In addition to carbon cycle, humans have altered the nitrogen and phosphorous cycles by adding these elements to croplands as fertilizers, which has contributed to over-fertilization of aquatic ecosystems when excess amounts are carried by runoff into local waterways.
	www.enviroliteracy.org /subcategory.php/198.html (710 words)

	ch04 (Site not responding. Last check: 2007-11-03)
		Energy for biogeochemical cycling is derived in part from the solar radiation, which drives photosynthesis, and atmospheric and oceanic circulation.
		Energy for biogeochemical cycling is also derived from geologic processes such as subduction and uplift which are associated with plated tectonics and weathering, erosion, and rock formation which are part of the rock cycle.
		A biogeochemical cycle is a pathway that a chemical follows as it cycles through the biota, soil, water, and atmosphere (Figure 4.2).
	drjoe.biology.ecu.edu /ch04/ch04.htm (2048 words)

	ATM S 211 - Notes
		The carbon cycle is one of a number of geochemical cycles and since it involves the biosphere it is sometimes referred to as a bio-geochemical cycle.
		In the the short term organic carbon cycle, the transfer rates are large but the biospheric reservoir is relatively small, whereas in the long term cycles the reverse is true.
		All three of these cycles are linked together as part of the global carbon cycle, but we examine them separately because they control atmospheric levels of CO on different timescales ranging from months (short term organic carbon cycle), to tens of millions of years (long term inorganic carbon cycle).
	www.atmos.washington.edu /2002Q4/211/notes_carboncycle.html (1564 words)

	Climate Part I: The Carbon Cycle and the Greenhouse Effect (Site not responding. Last check: 2007-11-03)
		It is a biogeochemical cycle because it involves the cycling of a chemical element – carbon – between organic (CHO) and inorganic (CO2 and carbonate/bicarbonate compounds) states.
		This cycle fades towards the tropics, and is reversed south of the equator.
		To ask the question, "where is the remainder?", examine the global carbon cycle, assume we have an accurate estimate of the amount of fossil fuels converted to CO2 (the source), and ask, "what are the possible sinks?".
	www-personal.umich.edu /~dallan/nre220/outline20.htm (1540 words)

	SCOPE 21 - The Major Biogeochemical Cycles and Their Interactions, Chapter02, C, N, P, and S Cycles: Major Reservoirs ...
		The natural cycle of P partly regulates the distribution of biomass because the supply and levels of phosphate are low relative to the requirements for plant and animal nutrition.
		Superimposed on the natural cycle is man's influence: the mining and consuming of phosphates by society, and the release of P in domestic and industrial effluents.
		This phenomenon also alters the cycles the C and N. Given the above observations, the P cycle is thus significantly perturbed by the activities of man. Figure 2.4 gives an overview of the reservoirs and fluxes of the global P cycle.
	www.icsu-scope.org /downloadpubs/scope21/chapter02.html (3880 words)

	Global Cycles of Biologically Active Elements
		The global cycles of biologically active elements are an important part of basic and advanced Earth Science, Ecology and Biogeochemistry courses.
		An understanding of biogeochemical cycles and anthropogenic impacts on them is also fundamental in studies of global climate change.
		Unfortunately, most presentations of biogeochemical cycles occupy one of two extremes: they are either presented so simply that they contain information on pathways only, or in such detail that they defy comprehension and are us eful only to specialists.
	www.ess.uci.edu /~reeburgh/figures.html (1095 words)

	Biogeochemical Cycles \| World of Earth Science
		The term biogeochemical cycle refers to any set of changes that occur as a particular element passes back and forth between the living and non-living worlds.
		When an organism dies, for example, the elements of which it is composed continue to move through a cycle, returning to the earth, to the air, to the ocean, or to another organism.
		The phosphorous cycle is an exception since phosphorus is essentially absent from the atmosphere.
	www.bookrags.com /research/biogeochemical-cycles-woes-01 (558 words)

	The Environmental Literacy Council - Nitrogen Cycle
		Nitrogen is both the most abundant element in the atmosphere and, as a building block of proteins and nucleic acids such as DNA, a crucially important component of all biological life.
		The nitrogen cycle is a complex biogeochemical cycle in which nitrogen is converted from its inert atmospheric molecular form (N
		The material covered includes biogeochemical cycles, properties of nitrogen, an illustration of the nitrogen cycle, and the effect of human activity on the cycle.
	www.enviroliteracy.org /article.php/479.html (739 words)

	Environmental Biology Sequence - Ecosystems
		The nitrogen cycle is one of the most difficult of the cycles to learn, simply because there are so many important forms of nitrogen, and because organisms are responsible for each of the interconversions.
		The phosphorous cycle is the simplest of the cycles that we will examine (I like to save the simplest for the last sometimes; it's like a cool-down period after a long run).
		This cycle will occur over and over until at last the phosphorous is lost at the bottom of the deepest parts of the ocean, where it becomes part of the sedimentary rocks forming there.
	www.marietta.edu /~biol/102/ecosystem.html (5677 words)

	Terrestrial ecosystems and the global biogeochemical silica cycle
		The global biogeochemical Si cycle is of great interest because of its impact on global CO concentrations through the combined processes of weathering of silicate minerals and transfer of CO from the atmosphere to the lithosphere.
		Internal recycling of the phytolith pool is intense with riverine fluxes of dissolved silicate to the oceans buffered by the terrestrial biogeochemical Si cycle, challenging the ability of weathering models to predict rates of weathering and consequently, changes in global climate.
		Consideration must be given to the influence of the terrestrial BSi pool on variations in the global biogeochemical Si cycle over geologic time and the influence man has had on modifying both the terrestrial and aquatic biogeochemical cycles.
	www.agu.org /pubs/crossref/2002/2002GB001894.shtml (294 words)

	SCOPE 13 - The Global Carbon Cycle, Chapter 1, The Global Biogeochemical Carbon Cycle
		A treatment of the carbon cycle implies consideration of physical, chemical, biological and geological processes that proceed on very different time scales, that is, from millions of years for the slow movement of the earth's crust, to weeks and days for the rapidly changing scene of the water surface of the sea.
		The flux of carbon due to the freshwater cycle is dealt with in Chapter 12.
		The oxygen cycle, therefore, is linked with the carbon cycle and the vertical distribution of oxygen will serve as an important piece of information in determining the relative role of water renewal and detritus decomposition for the maintenance of both the total carbon and oxygen distribution in the sea.
	www.icsu-scope.org /downloadpubs/scope13/chapter01.html (12518 words)

	carbon cycle
		The carbon cycle is one of the biogeochemical cycles.
		In the cycle there are various sinks, or stores, of carbon (represented by the boxes) and processes by which the various sinks exchange carbon (the arrows).
		Scientists are actively investigating the carbon cycle to see if their data does indeed indicate a balancing of the cycle.
	www.cotf.edu /ete/modules/carbon/efcarbon.html (553 words)

	chapter4.html (Site not responding. Last check: 2007-11-03)
		Biogeochemical cycles are part of the larger cycles that describe the functioning of the whole Earth (not just the surface parts)
		Time scale for this cycle is millions to hundreds of millions of years, so not a major concern of humans...
		Change is a part of natural biogeochemical cycles resulting in periods of abundant biota and periods of scarce biota (both ocean and land).
	www.colorado.edu /GeolSci/courses/GEOL1070/chap04/chapter4.html (1458 words)

	Dummies::Discovering the Biogeochemical Cycles
		The plants and animals that live and then die are the bio part; the earth that they decompose into comprises the geo part; and the process by which organic matter returns to the chemical elements in the earth is explained by the chemical part.
		There are four biogeochemical cycles, and each of them returns to the earth important elements that are required in living organisms.
		The nitrogen cycle (Figure 1) is the most complex biogeochemical cycle because nitrogen can exist in several different forms.
	www.dummies.com /WileyCDA/DummiesArticle/id-1207,subcat-MATH.html (802 words)

	Carbon cycle - Wikipedia, the free encyclopedia (via CobWeb/3.1 planetlab2.netlab.uky.edu) (Site not responding. Last check: 2007-11-03)
		The carbon cycle is the biogeochemical cycle by which carbon is exchanged between the biosphere, geosphere, hydrosphere and atmosphere of the Earth (other astronomical objects may have similar carbon cycles, but nothing is yet known about them).
		The cycle is usually thought of as four major reservoirs of carbon interconnected by pathways of exchange.
		The reservoirs are the atmosphere, the terrestrial biosphere (which usually includes freshwater systems and non-living organic material, such as soil carbon), the oceans (which includes dissolved inorganic carbon and living and non-living marine biota), and the sediments (which includes fossil fuels).
	en.wikipedia.org.cob-web.org:8888 /wiki/Carbon_cycle (1574 words)

	Water cycle - Wikipedia, the free encyclopedia
		The water cycle — technically known as the hydrologic cycle — is the continuous circulation of water within the Earth's hydrosphere, and is driven by solar radiation.
		Water moves from compartment to compartment, such as from river to ocean, by the physical processes of evaporation, precipitation, infiltration, runoff, and subsurface flow.
		Glacial retreat is also an example of a changing water cycle, where the supply of water to glaciers from precipitation cannot keep up with the loss of water from melting and sublimation.
	en.wikipedia.org /wiki/Water_cycle (1355 words)

	EO Printall
		But in contrast to land, carbon cycles between photosynthesis and respiration vary rapidly; i.e., there is virtually no storage of carbon as there is on land (i.e., tree trunks and soil).
		For example, notice in Figure 1 (schematic of the carbon cycle) that fossil fuel burning releases roughly 5.5 gigatons of carbon (GtC [giga=1 billion]) per year into the atmosphere and that land-use changes such as deforestation contribute roughly 1.6 GtC per year.
		It is designed to create new knowledge needed to understand the climatological, ecological, biogeochemical, and hydrological functioning of Amazonia, the impact of land-use change on these functions, and the interactions between Amazonia and the Earth system.
	earthobservatory.nasa.gov /Library/CarbonCycle/printall.php (3678 words)

	Nitrogen fixation (Site not responding. Last check: 2007-11-03)
		We shall deal first with the process of nitrogen fixation and the nitrogen-fixing organisms, then consider the microbial processes involved in the cycling of nitrogen in the biosphere.
		At any one time a large proportion of the total fixed nitrogen will be locked up in the biomass or in the dead remains of organisms (shown collectively as "organic matter").
		So, the only nitrogen available to support new growth will be that which is supplied by nitrogen fixation from the atmosphere (pathway 6 in the diagram) or by the release of ammonium or simple organic nitrogen compounds through the decomposition of organic matter (pathway 2).
	helios.bto.ed.ac.uk /bto/microbes/nitrogen.htm (2449 words)

	CIG: Sasha Turchyn
		I am particularly interested in changes in biogeochemical cycles in response to perturbations to Earth’s climate and how different biogeochemical cycles are coupled.
		Geomicrobiology is a critical component of understanding and interpreting biogeochemical cycles in a paleoceanographic context.
		Temporal variations in the oxygen isotopic composition of sulfate reflect changes in the microbial pathways dominating during the biogeochemical cycling of sulfur in organic rich sediments.
	eps.berkeley.edu /cig/turchyn (526 words)

	Nitrogen Cycles Project: 1. Overview
		Scientists need to be able to account for all the sources, transformations, and pathways of N in the environment to be able to determine the confidence, efficiency and effectiveness of N control strategies and policies.
		The purpose of this project is to provide an improved scientific basis for developing and testing improved mathematical process models for simulating the biogeochemical cycling of N in Illinois' environments, and for conducting N mass-balance studies.
		We start by discussing the general concept of biogeochemical cycles.
	www.sws.uiuc.edu /nitro/default.asp?sp=y (509 words)

	January 28, 2003
		The path an element takes as it moves from abiotic systems through living organisms and back again is referred to as its biogeochemical cycle.
		A key feature in all cycles is that nutrients are recycled and reused.
		The carbon cycle and the nitrogen cycle are examples of major, global biogeochemical cycles.
	www.msu.edu /course/lbs/144/s03/classnotes_012803.html (414 words)

	19: Biogeochemical Cycles
		Enzymes are needed to catalyze the biological reactions of the biogeochemical cycles.
		Most of the carbon within organisms comes from the carbon dioxide (CO in the air.The atmosphere is 0.03 mol % in CO However, the greatest physical reservoir of carbon is not atmospheric carbon dioxide but instead is located in the Earth's crust and is not easily accessible to biological organisms.
		The enzyme that affixes the CO to a pre-existing carbohydrate is usually considered the key diagnostic enzyme in a carbon cycle.
	www.biosci.ohio-state.edu /~mgonzalez/Micro521/19.html (2211 words)

	Water Cycle Research (WCR) nsf04577
		Nevertheless, the water cycle and its role as an agent of transport for mass and energy are both poorly understood.
		Determining how natural fluctuations and anthropogenic factors may impact the water cycle and its function as an agent of transport for multiple biologically and geochemically reactive substances is a major scientific challenge for the geosciences in the coming years.
		The categories of proposers identified in the Grant Proposal Guide are eligible to submit proposals under this program announcement/solicitation. There is no PI eligibility limit, nor is their a limit on the number of proposals that can be submitted by an institution.
	www.nsf.gov /pubs/2004/nsf04577/nsf04577.htm (3809 words)

Try your search on: Qwika (all wikis)