Clipping of news on Brazilian Culture, Law and Citizenship
04/05/2012
This article was translated by an automatic translation system, and was therefore not reviewed by people.
Plants are flowering earlier due to higher temperatures.
Research was published Wednesday in Nature.
Experiments that attempt to simulate the impact of global warming on plants underestimate what happens in the real world, a study published in this Wednesday in the British journal "Nature."
The research supports observations made by farmers and gardeners, especially in the Northern Hemisphere, according to which seasonal plants are blooming much earlier than in the past.
Experiments artificial global warming usually consist of a plant at the end into a chamber similar to a greenhouse without a lid, or tent roof in a small heater in order to replicate the effects of increasing temperature.
These experiments determined that the foliation and flowering occur between 1.9 and 3.3 days earlier for each degree Celsius of temperature rise. But the study says the exact number is much higher.
The warmer
The plants begin to develop leaves and flowers between 2.5 and 5 days earlier every 1 ° C warmer, highlighted the research, based on a comparison between experiments performed on heating at 1634 species of plants and long-term observations of these species in nature, carried out by 20 institutions in North America, Japan and Australia.
"Until now, it was assumed that experimental systems would respond the same way that natural systems respond, but it is not what happens," he said in a statement co-author Benjamin Cook, of the Lamont-Doherty Earth Observatory of the University Columbia in New York.
The experimental methods may fail because they reduce light, wind and soil moisture, seasonal affecting the maturity of the plant, said the article.
More rapid heating
According to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC), published in 2007, the surface temperatures of the world rose 0.74 degrees Celsius between 1906 and 2005.
According to current trends in carbon emissions, responsible for the increase of temperature on the globe, the Earth is headed for an additional warming of 2 ° C or more, according to estimates published by other sources last year.
To some experts, these estimates are conservative. They claim that many sites are warming much faster than the global average.
"The blossoming of cherry trees in Washington, United States, a phenomenon meticulously recorded and celebrated, anticipated in about a week since the 1970s," said the statement published by the Earth Institute at Columbia University.
"If the trend continues, some recent projections say they will be coming out in February around 2080," he concluded.
Source: G1 News
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This article was translated by an automatic translation system, and was therefore not reviewed by people.