HOME >> BIOLOGY >> NEWS
How trees changed the world

Before 380 million years (Ma) ago, the continents had only patches of mosses and algae with no tree cover. The effect of the evolution of trees (large vascular plants with deep, extensive roots) changed the world for ever, according to Dr Robert Berner (Yale University). He presents his findings at Earth Systems Processes, a multidisciplinary meeting in Edinburgh, UK, hosted jointly by the Geological Society of London (GSL) and the Geological Society of America (GSA).

The first trees soaked up nutrients from rocks at a rate never before seen. This enhanced the weathering of calcium (Ca) and magnesium (Mg) silicate minerals, which in turn removed carbon dioxide from the atmosphere as Ca and Mg became locked together with carbonate ions in lime-rich sediments in the worlds oceans. The removal of CO2 from the atmosphere by this method and by increased photosynthesis (fixation) led to atmospheric CO2 stabilising at lower levels than the world had known for most of its previous 4200Ma history.

Trees also produced, for the first time, large amounts of lignin - the major constituent of wood. Resistant to decay, this substance led to increased amounts of organic carbon being buried with sediments, representing a large excess of global photosynthesis (carbon fixation) over global respiration (carbon oxidation). As atmospheric carbon dioxide was progressively reduced and photosynthesis reached unprecedented levels, the atmosphere became extremely rich in oxygen much richer than the air we know today.

Oxygen-enriched air was directly responsible for the evolution of very large insects - much larger than could live in todays relatively oxygen-poor air (insects rely upon more or less passive diffusion of O2 into their tissues, so large bodies become impossible at lower concentrations).

As well as the formation of huge coal deposits well known from Upper Carboniferous (Pennsylvanian) rocks worldwide, this radical shift in the Carbon Cycle also low
'"/>

Contact: Ann Cairns
acairns@geosociety.org
303-447-2020 x1156
Geological Society of America
26-Jun-2001


Page: 1 2

Related biology news :

1. Study: Emission of smog ingredients from trees is increasing rapidly
2. Plumbing trees plumbing reveals their engineering skill
3. An exotic grass kills trees by hijacking their water
4. Duke study disputes idea that trees can relocate quickly in response to climate change
5. Limited climate tracking in European trees despite 10,000 years of postglacial warmth
6. Newfound grasshopper takes to the trees on Konza Prairie
7. Chestnut trees to spread across landscape again, says Purdue scientist
8. Brood X cicadas will cause limited damage to trees, yard plants across eastern U.S.
9. Seeing the forest for the trees: The future of environmental policy lies in interaction
10. Armies of fighting fungi protect chocolate trees
11. Science paper: Overharvesting of Brazil nuts leading to fewer trees

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:4/24/2017)... , April 24, 2017 Janice ... partner with  Identity Strategy Partners, LLP (IdSP) , ... or without President Trump,s March 6, 2017 ... Entry , refugee vetting can be instilled with greater ... (Right now, all refugee applications are suspended by ...
(Date:4/13/2017)... 2017 According to a new market research report ... Identity Administration, and Authorization), Service, Authentication Type, Deployment Mode, Vertical, and Region ... expected to grow from USD 14.30 Billion in 2017 to USD 31.75 ... ... MarketsandMarkets Logo ...
(Date:4/6/2017)... 2017 Forecasts by Product Type ... by End-Use (Transportation & Logistics, Government & Public Sector, ... Fossil Generation Facility, Nuclear Power), Industrial, Retail, Business Organisation ... Are you looking for a definitive report on the ... ...
Breaking Biology News(10 mins):
(Date:10/11/2017)... ... October 11, 2017 , ... Singh Biotechnology today ... designation to SBT-100, its novel anti-STAT3 (Signal Transducer and Activator of Transcription 3) ... able to cross the cell membrane and bind intracellular STAT3 and inhibit its ...
(Date:10/10/2017)... ... October 10, 2017 , ... Dr. Bob Harman, founder and CEO ... Diego Rotary Club. The event entitled “Stem Cells and Their Regenerative ... attendees. Dr. Harman, DVM, MPVM was joined by two human doctors: Peter B. ...
(Date:10/10/2017)... ... 10, 2017 , ... The Pittcon Program Committee is pleased ... scientists who have made outstanding contributions to analytical chemistry and applied spectroscopy. Each ... leading conference and exposition for laboratory science, which will be held February 26-March ...
(Date:10/9/2017)... ... October 09, 2017 , ... The Giving ... marijuana products targeting the needs of consumers who are incorporating medical marijuana into ... in Phoenix, Arizona. , As operators of two successful Valley dispensaries, The Giving ...
Breaking Biology Technology:
Cached News: