Växthusgasutsläpp vid sandinblandning i torvjordar
Peat soils are organic soils which make up significant parts of Sweden land area. Peat soils are commonly used in agriculture. Growing crops in these soils require drainage which speeds up the degradation of the organic matter and increases the greenhouse gas emissions. Cultivated organic soils a...
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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 organic soils which make up significant parts of Sweden land area. Peat soils are
commonly used in agriculture. Growing crops in these soils require drainage which speeds up the
degradation of the organic matter and increases the greenhouse gas emissions. Cultivated organic soils
are responsible for 6-8 % of the total amount of anthropogenic greenhouse gas emissions in Sweden.
Previous studies show a decreased emission flow in peat soils with waste foundry sand mixed in. In this
study, sand and waste foundry sand is mixed in with peat in depths of 2,5 cm and 5 cm, respectively and
studied in a lab environment where emissions of carbon dioxide, nitrous oxide and methane gas were
measured. Results show a noteworthy decrease in carbon dioxide emissions from samples with 5 cm
sand/waste foundry sand mixed in. The waste foundry sand raised the pH level in the soil more than
sand. This is likely the reason that waste foundry sand performed slightly higher emissions since it
improves living conditions for the microorganisms in the soil. Measurements of nitrous oxide and
methane gas showed no clear signs of emissions. The measured concentrations were equivalent to
those occurring naturally in the lab. The conclusion of this study is that both sand and waste foundry
sand can be positive for decreasing the carbon dioxide emissions from peat soils. In order to ensure this
result more substantial studies and a deeper knowledge of the processes in the soils is required. |
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