Tillsats av biokol till en svensk sandjord : effekter på lustgasavgång, kväveretention och andel vattenfyllda porer
In a column experiment the effect of three different biochars on nitrous gas emissions, nitrogen retention and water filled pore space (WFPS) were studied in a Swedish sandy soil, classified as a Cryopsamment. Ammonium retention was positively correlated, while KCl-extractable ammonium was negativel...
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| Formato: | M2 |
| Lenguaje: | sueco Inglés |
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SLU/Dept. of Soil and Environment
2009
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| Materias: |
| Sumario: | In a column experiment the effect of three different biochars on nitrous gas emissions, nitrogen
retention and water filled pore space (WFPS) were studied in a Swedish sandy soil, classified as a
Cryopsamment. Ammonium retention was positively correlated, while KCl-extractable ammonium
was negatively correlated, with the specific area of the biochars. The question was raised whether the
negative correlation between extractable ammonium and biochar specific area reflects the amount of
ammonium present in the soil or its extractability from the biochar, and whether methods for
extracting soil mineral nitrogen, like KCl-extractions, have to be modified for application on biochar
amended soils. There was a tendency of increased nitrate retention and KCl-extractable nitrate with
biochar and KCl-extractable nitrate was positively correlated with the specific area of the biochar. pH
was higher for all biochars compared with control, although the differences were not significant, and
WFPS was lowered by biochar addition, significantly in one case. Nitrous oxide emissions were
generelly lower from biochar amended columns, although emissions from one of the biochars was
higher than control in the beginning of the measurements. The effect on nitrous oxide emissions
seem, in part, to be mediated by the increase in pH from the biochar addition. Among other factors,
nitrous oxide emissions was also negatively correlated with the specific area of the biochar. |
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