Fluxes and production pathways of nitrous oxide in different types of tropical forest soils in Thailand
Journal article
Authors/Editors
Strategic Research Themes
No matching items found.
Publication Details
Author list: Vanitchung S., Conrad R., Harvey N.W., Chidthaisong A.
Publication year: 2011
Volume number: 57
Issue number: 5
Start page: 650
End page: 658
Number of pages: 9
ISSN: 0038-0768
eISSN: 0038-0768
Languages: English-Great Britain (EN-GB)
View in Web of Science | View on publisher site | View citing articles in Web of Science
Abstract
Nitrous oxide (N 2O) emissions from the soil surface of five different forest types in Thailand were measured using the closed chamber method. Soil samples were also taken to study the N 2O production pathways. The monthly average emissions (±SD, n=12) of N 2O from dry evergreen forest (DEF), hill evergreen forest (HEF), moist evergreen forest (MEF), mixed deciduous forest (MDF) and acacia reforestation (ARF) were 13.0±8.2, 5.7±7.1, 1.2±12.1, 7.3±8.5 and 16.7±9.2 μg N m -2 h -1respectively. Large seasonal variations in fluxes were observed. Emission was relatively higher during the wet season than during the dry season, indicating that soil moisture and denitrification were probably the main controlling factors. Net N 2O uptake was also observed occasionally. Laboratory studies were conducted to further investigate the influence of moisture and the N 2O production pathways. Production rates at 30% water holding capacity (WHC) were 3.9±0.2, 0.5±0.06 and 0.87±0.01 ng N 2O-nitrogen (N) g-dw -1day -1 in DEF, HEF and MEF respectively. At 60% WHC, N 2O production rates in DEF, HEF and MEF soils increased by factors of 68, 9 and 502, respectively. Denitrification was found to be the main N 2O production pathway in these soils except in MEF. © 2011 Japanese Society of Soil Science and Plant Nutrition.
Keywords
N 2O emission, N 2O production pathway, Tropical forest soil
Contact Information