Spatial variations in nitrous oxide and nitric oxide emission potential on a slope of Japanese cedar (Cryptomeria japonica) forest
Article first published online: 28 JAN 2009
© 2009 Japanese Society of Soil Science and Plant Nutrition
Soil Science & Plant Nutrition
Volume 55, Issue 1, pages 179–189, February 2009
How to Cite
NISHINA, K., TAKENAKA, C. and ISHIZUKA, S. (2009), Spatial variations in nitrous oxide and nitric oxide emission potential on a slope of Japanese cedar (Cryptomeria japonica) forest. Soil Science & Plant Nutrition, 55: 179–189. doi: 10.1111/j.1747-0765.2007.00315.x
- Issue published online: 28 JAN 2009
- Article first published online: 28 JAN 2009
- Received 3 February 2008.; Accepted for publication 8 August 2008.
- acetylene inhibition;
- nitric oxide;
- nitrous oxide;
- spatial variation
To quantify the spatial variation and spatial structure of nitrous oxide (N2O) and nitric oxide (NO) emission from forest soils, we measured N2O and NO emission rates from surface soil cores taken at 1 m intervals on a cross-line transect (65 m × 20 m) on a slope of Japanese cedar (Cryptomeria japonica) forest in a temperate region of central Japan and analyzed the spatial dependency of N oxide gas emissions using geostatistics. We divided N2O emission into N2O from denitrification and N2O from nitrification using the acetylene inhibition method. According to the geostatistical analysis, N2O emission rates on the slope had large spatial variation and weak spatial dependency. This weak spatial dependency was caused by the inordinately high N2O emissions on the slope, which were derived mainly from denitrification. In contrast, NO emission rate on the slope had large spatial variation, but strong spatial dependency and a distinct spatial distribution related to slope position, that is, high in the middle of the slope and low in the shoulder and the foot of the slope. The CN ratio and water-filled pore space were the dominant factors controlling NO emission rate on a slope. Our results suggest that spatial information about topographic factors helps to improve the estimation of both N2O emission and NO emission from forest soils.