Evaluation of greenhouse gas emissions and area of organic soils in cropland and grassland in Latvia – integrated National forest inventory data and soil maps approach
Laen...
Kuupäev
2018
Kättesaadav alates
Autorid
Petaja, G.
Okmanis, M.
Polmanis, K.
Stola, J.
Spalva, G.
Jansons, J.
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Abstrakt
The aim of the research was to assess distribution of organic soils in farmlands for the
time period between 1990 and 2015, as well as to carry out a recalculation of GHG emissions
from organic soils in grassland and cropland. We evaluated the area of typical organic soils using
digitized soil maps created between 1960s and 1980s there were 183,000 ha of cropland and
grassland on organic soils. A selected number of areas on organic soils intersecting with the
National forest inventory (NFI) plots were surveyed. We found that 66 ± 10% of surveyed plots
still conforms to criteria for organic soils according to Intergovernmental Panel on Climate
Change (IPCC) guidelines; in the rest of plots soil organic matter has been mineralized and these
areas do not conform to IPCC criteria of organic soils. The following distributionof organic soils
was estimated in cropland – 6.3 ± 3.3% in 1990 and 4.1 ± 3.4% in 2015, but in grassland –
11.6 ± 3.6% in 1990 and 7.7 ± 3.9% in 2015. The annual reduction of GHG emissions due to
reduction of area of organic soils in cropland in 2015 corresponds to 1,400,000 tonnes CO2 eq. in
comparison to 1990 and in grassland – to 1,100,000 tonnes CO2 eq. The estimated reduction of
the GHG emissions due to conversion of organic soils into mineral soils, comparing the average
value in 2005–2009 with the projection for 2021–2030 on average will correspond to 313,000
tonnes CO2 eq. annually, however LULUCF sector still won’t become a net CO2 sink according
to the GHG inventory data on other land use categories and carbon pools.
Kirjeldus
Article
Märksõnad
cropland, grassland, GHG emissions, organic soil, articles