Brief description
Greenhouse gas emissions from a well established, unfertilized tropical grass-legume pasture were monitored over two consecutive years using high resolution automatic sampling. Nitrous oxide emissions were highest during the summer months and were highly episodic, related more to the size and distribution of rain events than WFPS alone. Mean annual emissions were significantly higher during 2008 (5.7 ± 1.0 g N2O-N ha day) than 2007 (3.9 ± 0.4 and g N2O-N ha day) despite receiving nearly 500 mm less rain. Mean CO2 (28.2 ± 1.5 kg CO2 C ha day) was not significantly different (P < 0.01) between measurement years, emissions being highly dependent on temperature. A negative correlation between CO2 and WFPS at >70% indicated threshold for soil conditions favouring denitrification. The use automatic chambers for high resolution greenhouse gas sampling can greatly reduce emission estimation errors associated with temperature and WFPS changes. Two continuous years of high temporal resolution soil and environmental data was collected from Site 1 between 01 March 2007 and 28th February 2009. For determination of soil borne CH4, N2O and CO2 fluxes an automated gas sampling system was utilized, similar to the one described in detail by Breuer et al. (2000) and Kiese et al. (2003). Despite short-term breakdowns due to the hot and humid conditions, flooding and the destruction of sampling lines by native rodents, over 11,000 emission rates from each of the 3 greenhouse gases were obtained.Data time period: 2007-03-01 to 2009-02-28
Subjects
Auto Chambers |
CH4 |
CO2 |
Environmental Science and Management |
Environmental Sciences |
Grass-legume pasture |
Humid |
Improved pasture |
Interannual Variation |
Mooloolah |
N2O |
Nitrous oxide |
QLD |
Subtropical |
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Identifiers
- Local : Rowlings.21
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