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Distribution of nitrous oxide emissions from managed organic soils under different land uses estimated by the peat C/N ratio to improve national GHG inventories.
- Source :
-
Science of the Total Environment . Aug2018, Vol. 631, p23-26. 4p. - Publication Year :
- 2018
-
Abstract
- Nitrous oxide (N 2 O) contributes substantially to greenhouse gas (GHG) emissions in the agricultural and land-use sectors. Owing to the high effort needed for measuring N 2 O emissions and the resulting lack of sufficient field measurements to apply at country-wide scale, soil-borne N 2 O emissions are often estimated by applying published IPCC default emission factors. To examine the data reported in the national GHG inventory, the current study utilizes a large data set of soil C/N ratios to predict N 2 O emissions and their distribution from drained organic soils in Switzerland. Calculated emission rates increase in the order of forest < grassland < cropland, and they are similar to the mean values currently used in the inventory. Distributions of N 2 O emissions are highly positive-skewed and they reveal probabilities of 10 and 14% for cropland and grassland, respectively, to be above 20 kg of N 2 O-N per hectare and year. It is likely that the greater part of N 2 O from drained organic soil derives from N released upon peat decomposition, and not from fertilization. In conclusion, this research shows that measurement of soil C/N ratios improves the reliability of organic soil N 2 O emissions estimates on a national scale and identifies site conditions where future emission measurements would be most effective for reducing the uncertainty in the GHG inventory. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00489697
- Volume :
- 631
- Database :
- Academic Search Index
- Journal :
- Science of the Total Environment
- Publication Type :
- Academic Journal
- Accession number :
- 129294582
- Full Text :
- https://doi.org/10.1016/j.scitotenv.2018.02.328