
	International Journal of Agricultural Research
	Year: 2009 \| Volume: 4 \| Issue: 1 \| Page No.: 1-16 DOI: 10.3923/ijar.2009.1.16

Nitrous Oxide (N₂O) Emissions from a Japanese Lowland Soil Cropped to Onion: III. Relationship with Soil Physical Properties

Nsalambi V. Nkongolo, Kanta Kuramochi and Hatano Ryusuke

Abstract: We studied the spatial variability of soil physical properties and related these properties to N₂O emissions. The study was conducted in a Japanese lowland soil cropped to onion in Mikassa, Hokkaido (Japan). N₂O emissions measurements and soil sampling were conducted along a 100x100 m (1999) and 60x60 m (2000) grids with samples taken at 10 m spacing. Air samples for N₂O determination were collected using the closed-chamber technique. Air samples were stored in vial bottles for analysis with a gas chromatograph with electron capture detector within 24 h after sampling. Soil samples were collected with a 5 cm diameter and a 5 cm height cylinder. Soil physical properties measured were soil temperature (T), bulk density (Ï?b), volumetric water content (Î¸_v), gravimetric water content (Î¸_g), air-filled porosity (fa), total pore space (TPS), relative gas diffusivity coefficient (D_s/D_o) and the pore tortuosity factor (Ï„). Results showed that N₂O emissions were highest in 1999 as compared to 2000. They were fitted to a linear variogram in 1999 while they responded to a spherical variogram model in 2000. Positive first degree surface trends were also found in N₂O emissions data in both years and the removal of these trends did not change variogram models, but significantly improved them by increasing the R² and Q values. Soil physical properties responded to a range of variograms, from linear to spherical models. Detrending soil physical properties either increased (T) or decreased (Î¸_v) the range and R² values. Soil T, Ï„, D_s/D_o, WFPS were significantly correlated with N₂O emissions. N₂O emissions and soil properties varied considerably in space and time. More studies are needed to identify other soil physical properties which might better correlate with N₂O emissions, besides the traditional T and WFPS.

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How to cite this article:

Nsalambi V. Nkongolo, Kanta Kuramochi and Hatano Ryusuke, 2009. Nitrous Oxide (N₂O) Emissions from a Japanese Lowland Soil Cropped to Onion: III. Relationship with Soil Physical Properties. International Journal of Agricultural Research, 4: 1-16.

DOI: 10.3923/ijar.2009.1.16

URL: https://scialert.net/abstract/?doi=ijar.2009.1.16

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Nitrous Oxide (N2O) Emissions from a Japanese Lowland Soil Cropped to Onion: III. Relationship with Soil Physical Properties

Nitrous Oxide (N₂O) Emissions from a Japanese Lowland Soil Cropped to Onion: III. Relationship with Soil Physical Properties