Kalkningens påverkan på växthusgasemissioner från odlad torvjord
Peat soils are used for agriculture and to improve the conditions they are drained and limed. These actions lead to improved living conditions for the microorganisms that live in the soil which increases the decomposition of the organic matter. In the process of decomposition the greenhouse gases...
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| Formato: | M2 |
| Lenguaje: | sueco Inglés |
| Publicado: |
SLU/Dept. of Soil and Environment
2018
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| Materias: |
| Sumario: | Peat soils are used for agriculture and to improve the conditions they are drained and limed.
These actions lead to improved living conditions for the microorganisms that live in the soil
which increases the decomposition of the organic matter. In the process of decomposition the
greenhouse gases carbon dioxide (CO2) and nitrous oxide (N2O) are produced. Cultivated peat
soils do therefore contribute to the global warming by emissions of CO2 and N2O. The aim of
this experiment was to test the effect on emissions from cultivated peat soils caused by drainage
and liming. In the experiment CO2 and N2O emissions were measured on cylinder soil samples
prepared as 4 treatments (corresponding to untreated sample and 10, 20 and 40 ton lime/ha
respectively) and each treatment was repeated 5 times. The emission measurements were
performed at 6 different drainage depths (saturated, 25, 37, 50, 75 and 100 cm from the soil
surface). For each treatment measurements of the soils properties were preformed to investigate
possible relationship with the emissions.
The results showed increased CO2 emissions for the untreated sample between
saturated and drainage depth of 25 cm. In the treatments with lime the results were the opposite
and the emissions decreased at the first drainage depth. Except that the emissions from the
untreated sample were lower at all drainage depths no big differences were measured at further
drainage. The emissions within the treatments varied and there were also a difference in which
treatment that gave the highest emissions at the different drainage depths. The results for the
N2O emissions only showed clear values at saturated conditions, where they were higher than
at the other drainage depths. The big difference at saturated conditions, for both gases, gives a
high uncertainty and it is difficult to make conclusions. When a comparison between the limed
treatments are made the results from this experiment shows that the water content has a greater
effect on the emissions than the lime content. |
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