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A NEW study has cast doubt on the ability of modern grasslands to fight climate change. An investigation into why the world’s 50 million square kilometres of grasslands aren’t soaking up more CO2 from the atmosphere has shown many such habitats reached their peak over 100 years ago. Based on UK grown samples, the study also shows that grasses are physiologically constrained from taking up further CO2 – even when nitrogen fertilisers are added to encourage their growth. In fact, grasslands that have received high levels of nitrogen fertiliser are today yielding less than they were a century ago. This latest analysis of samples from the world’s longest running ecological experiment, Park Grass, shows that some of the planet’s most productive grasslands may have reached carbon saturation sometime near the beginning of the 20th century or earlier when the concentration of atmospheric CO2 was only two thirds of its current level. ....
Article content The rise in atmospheric carbon dioxide concentration and concurrent climate change has led to yield reductions of grass-rich grassland vegetation in the past century. This observation was made by researchers at the Technical University of Munich (TUM) who, working jointly with colleagues from Rothamsted (U.K.), conducted a study on the worldâs oldest permanent ecological experiment there. We apologize, but this video has failed to load. Try refreshing your browser. Effects of CO2Â increase were already apparent in the past century Back to video âBased on field experiments with increased carbon dioxide concentration, artificial warming, and modified water supply, scientists understand quite well how future climate change will affect grassland vegetation. Such knowledge is largely missing for effects that already occurred in the last century,â says Hans Schnyder, Professor of Grassland at the TUM. ....
Effects of CO2 increase were already apparent in the past century stthomastimesjournal.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from stthomastimesjournal.com Daily Mail and Mail on Sunday newspapers.