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Watch How America’s Lands Changed From Forests to Fields

Watch How America’s Lands Changed From Forests to Fields | Biomes | Scoop.it
Arthromes are like biomes, but they acknowledge humanity's influence (RT @SmithsonianMag: "Arthromes" are like biomes, but they acknowledge humanity's influence http://t.co/Z7HTnxxXPl)...
Ruth Denton's insight:

Excellent visual.

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Rescooped by Ruth Denton from GTAV AC:G Y9 - Biomes and food security
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Agricultural innovation in Australia

Agricultural innovation in Australia | Biomes | Scoop.it

Via Geography Teachers' Association of Victoria Inc. (GTAV)
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Geography Teachers' Association of Victoria Inc. (GTAV)'s curator insight, July 18, 2013 11:00 PM

CD - The environmental, economic and technological factors that influence crop yields in Australia and across the world.

 

Students can explore some of the historical and contemporary innovations and farming practices that have made Australian farmers among the best in the world. They can also consider the agricultural use of the land in a variety of locations, highlighting the importance of good farming practice to maintain sustainable production.

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Bottlenose Dolphin Deaths Along US East Coast Seen At Higher Than Normal ... - Huffington Post

Bottlenose Dolphin Deaths Along US East Coast Seen At Higher Than Normal ... - Huffington Post | Biomes | Scoop.it
Bottlenose Dolphin Deaths Along US East Coast Seen At Higher Than Normal ...
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Rescooped by Ruth Denton from biomes threatened by man
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Soybean and livestock farming behind deforestation - Asahi Shimbun

Soybean and livestock farming behind deforestation - Asahi Shimbun | Biomes | Scoop.it
Soybean and livestock farming behind deforestationAsahi ShimbunThe primary causes of deforestation are pasturage and soybean cultivation.

Via Diane VanSwol
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Rescooped by Ruth Denton from Amazing Science
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Forests worldwide near tipping-point from drought, study finds

Forests worldwide near tipping-point from drought, study finds | Biomes | Scoop.it

Forests worldwide are at "equally high risk" to die-off from drought conditions, warns a new study published this week in the journal Nature. The study, conducted by an international team of scientists, assessed the specific physiological effects of drought on 226 tree species at 81 sites in different biomes around the world. It found that 70 percent of the species sampled are particularly vulnerable to reduction in water availability. With drought conditions increasing around the globe due to climate change and deforestation, the research suggests large swathes of the world's forests — and the services they afford — may be approaching a tipping point.

 

Water is critical to trees, transporting nutrients, providing stabilizing, and serving as a medium for the metabolic processes that generate the energy needed for a tree to survive. Mechanically, water moves through plants via their xylem, a tissue that can be compared to a system of tubes. Transpiration or release of water from a plant's leaves keeps the system moving. But when water availability is insufficient, the process begins to break down, having substantial impacts on the health of a tree. While this has long been observed, until recently the exact mechanism that triggers drought stress in forests was poorly understood. The new study argues that "hydraulic failure" may be a key factor. Effectively, insufficient water availably leads a tree to start pulling air bubbles — called gas emboli — into its xylem impeding the flow of water. Hydraulic failure is akin to attempting to drink through a broken straw — air bubbles significantly reduce the amount of liquid that reaches the top of the straw.

 

The researchers found that a wide range of trees are susceptible to "hydraulic failure". "We show that 70% of 226 forest species from 81 sites worldwide operate with narrow... hydraulic safety margins against injurious levels of drought stress and therefore potentially face long-term reductions in productivity and survival if temperature and aridity increase as predicted for many regions across the globe," the authors write. "Safety margins are largely independent of mean annual precipitation, showing that there is global convergence in the vulnerability of forests to drought, with all forest biomes equally vulnerable to hydraulic failure regardless of their current rainfall environment."

 

The results provide insight on why drought-induced forest die-off is occurring in a range of forest types, including tropical rainforests which are not typically considered at risk of drought. Over the past 15 years, forests in Borneo and the Amazon have suffered from widespread drought-induced decline. Drought stress if often accompanied by increased incidence of fires, either from natural sources like lightning or human activities like burning for cattle pasture of plantation establishment.


Via Dr. Stefan Gruenwald
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Lauri's curator insight, August 3, 2013 8:11 PM

If we lose our forests, we are well and truly screwed.

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The 10 Biggest Deserts on Earth - LiveScience.com

The 10 Biggest Deserts on Earth - LiveScience.com | Biomes | Scoop.it
The 10 Biggest Deserts on Earth
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Deforestation Adds More Atmospheric CO2 than the Sum Total of ...

Deforestation Adds More Atmospheric CO2 than the Sum Total of ... | Biomes | Scoop.it
Deforestation in tropical rainforests adds more carbon dioxide to the Earth's atmosphere than the sum total of cars and trucks on the world's roads. Cars and trucks account for 14% of global carbon emissions, while most ...

Via Diane VanSwol
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Terrestrial biomes: Tundra - by Jose Juan Gutierrez - Helium

Terrestrial biomes: Tundra - by Jose Juan Gutierrez - Helium | Biomes | Scoop.it
The tundra biome is characterized by extremely low temperatures throughout most of the year, along with a short summer season, during which plants..., Jose Juan Gutierrez (The #Tundra #Biome is a #Region of #Extremely low #Temperatures #Arctic #Antarctic...
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