When the temperature of the air of the swamp instead of carbon accumulation, become a source of its emission into the atmosphere. Scientists have confirmed that long-standing hypothesis, exposing isolated areas of sphagnum bogs in Minnesota of artificial heat for four years. In average, these sections began to lose 31.3 grams of carbon per square meter of surface per year. The results of their study published in the journal AGU Advances.
In mire ecosystems of the Earth is stored in the order of thousands of gigatons of carbon. There it is converted into peat deposits and permanently eliminated from the biological cycle. However, this conservation is accompanied by specific conditions: high humidity, low temperatures and acidic reactions in the environment. Global climate change makes the regions of the distribution of wetlands in the high latitudes of the increasingly dry and warm, which could potentially lead to violations of the sustainability of marsh ecosystems and releasing large quantities of greenhouse gases into the atmosphere.
Bolotovoy under the direction of Paul Henson from the Institute of Earth Sciences and climate change in the ridge investigated the response of wetlands to climate warming. To do this, they conducted a field experiment in a sphagnum-dominated bog with an area of 8.1 hectares in Northern Minnesota. The study authors found 10 structures resembling greenhouses with a diameter of 12 meters and a height of 7 meters with an open top. Within these structures artificially heated the air and soil of wetland ecosystems on +2,25; +4,5; +6,75 +9 degrees Celsius, respectively. Two greenhouses were the control areas of the ecosystem within them unaltered the microclimate.
To heat the air used propane furnace with a recirculation system, and heating of the soil — heaters enclosed in a pipe and buried to a depth of 2-3 meters. The temperature was monitored with thermometers at a height of two meters, the soil — at a depth of two meters. For modelling future climate change the study authors artificially increased the concentration of carbon dioxide in the air over certain areas. The experiment lasted from June 2014 to June 2018, passing through different phases: in 2014 began to warm the soil and air, two years later, to this is added artificial emission of CO2.