Climate change may enhance or diminish ecosystem productivity, depending on environmental factors such as nitrogen or water availability. CO2 enrichment initially enhances productivity, but over time (days to years) this enhancement declines, a phenomenon called CO2 acclimation. One possible cause of CO2 acclimation is progressive nitrogen limitation.
Aspen are growing under different CO2 atmospheres in the free air CO2 enrichment (FACE) site in Rheinlander, WI.
Michelle N. Tremblay & Edward B. Mondor, Georgia Southern U.
Humans began to cultivate food crops about 10,000 years ago. Prior to that time, hunter-gatherers secured their food as they traveled in the nearby environment. When they...
Seagrasses as carbon sinkLast Updated on 2012-05-22 00:00:00
Research finds that the global carbon pool in seagrass beds is as much as 19.9 billion metric tons. They are vital to understanding climate change—they can store up to twice as much carbon as the world's temperate and tropical forests.
Seagrasses Can Store as Much Carbon as Forests
Seagrasses are a vital part of the solution to climate change and, per unit area, seagrass meadows can store up to twice as much carbon as the world's temperate and tropical forests.
So report researchers publishing a paper in the journal Nature Geoscience. The paper, "Seagrass Ecosystems as a Globally Significant Carbon Stock," is the first global analysis of carbon stored in seagrasses. The results demonstrate that coastal seagrass beds store up to 83,000 metric tons of carbon per square kilometer, mostly in the soils beneath them.
As a comparison, a typical... More »
Invasive Plant AbundanceLast Updated on 2011-02-01 00:00:00
Home and Away: Are Invasive Plant Species
Really That Special?
Invasive plants are a major environmental problem--but how abundant are they?
Invasive plant species are a serious environmental, economic and social problem worldwide. Their abundance can lead to lost native biodiversity and such ecosystem functions as nutrient cycling.
Despite substantial research, however, little is known about why some species dominate new habitats over native plants that technically should have the advantage.
A common but rarely tested assumption, say biologists, is that these plants behave in a special way, making them more abundant when introduced into communities versus native plants that are already there.
If true, it would mean that biosecurity screening procedures need to address how species will behave once introduced to nonnative communities--very... More »
Agriculture ILast Updated on 2010-12-28 04:17:57
Humans began to cultivate food crops about 10,000 years ago. Prior to that time, hunter-gatherers secured their food as they traveled in the nearby environment. When they observed some of the grains left behind at their campsites sprouting and growing to harvest, they began to cultivate these grains. From these humble beginnings agriculture began. More »
Drag and drop the content to change the order of featured content. The top nine will be displayed.