pp. 96-98, 2010, (Gilkes, R.J, Prakongkep, N. (Eds.). Proceedings 19th World Congress of Soil Science 2010; Published on DVD; http://www.iuss.org; Congress Symposium 4; Greenhouse gases from soils, IUSS, Brisbane, pp. 96-98.).
@article{Scheer2010b,
title = {Greenhouse Gas Emissions From Intensive Pasture On Ferrosol In Northern Nsw, Australia: Impact Of Biochar Amendment},
author = {Clemens Scheer and Peter R. Grace and Dave Rowling and Stephen Kimber and Lukas Van Zwieten},
url = {http://soilscienceaustralia.com.au/19th-world-congress-of-soil-science},
year = {2010},
date = {2010-08-01},
pages = {96-98},
abstract = {An intensive field campaign was performed from April to June 2009 to assess the effect of biochar amendment on the emission of soil-borne GHGs from a sub-tropical pasture on acidic ferrosol. Over the whole measurement period high emissions of N2O and high fluxes of CO2 could be observed, whereas a net uptake of CH4 was measured. Only small differences in the fluxes of N2O and CH4 from the biochar amended plots (35.33 ± 4.83 µg N2O-N/m2/h, -6.76 ± 0.20 µg CH4 -C/m2/h) vs. the control plots (31.08 ± 3.50 µg N2O-N/m2/h, -7.30 ± 0.19 µg CH4 -C/m2/h) could be observed, while there was no significant difference in the fluxes of CO2. However, it could be observed that N2O emissions were significantly lower from the biochar amended plots during periods with low emission rates (< 50 µg N2O-N/m2/h). Only during an extremely high emission event following heavy rainfall N2O emissions from the biochar amended plots were higher than from the control plots. Our results demonstrate that pastures on ferrosols in Northern NSW are a significant source of GHG and that the amendment of biochar can alter those emissions. However, more field and laboratory incubation studies covering prolonged observation periods are needed to clarify the impact of biochar amendment on soil microbial processes and the emission of soil-borne GHGs.},
note = {Gilkes, R.J, Prakongkep, N. (Eds.). Proceedings 19th World Congress of Soil Science 2010; Published on DVD; http://www.iuss.org; Congress Symposium 4; Greenhouse gases from soils, IUSS, Brisbane, pp. 96-98.},
keywords = {Improved process understanding and new technologies},
pubstate = {published},
tppubtype = {article}
}
An intensive field campaign was performed from April to June 2009 to assess the effect of biochar amendment on the emission of soil-borne GHGs from a sub-tropical pasture on acidic ferrosol. Over the whole measurement period high emissions of N2O and high fluxes of CO2 could be observed, whereas a net uptake of CH4 was measured. Only small differences in the fluxes of N2O and CH4 from the biochar amended plots (35.33 ± 4.83 µg N2O-N/m2/h, -6.76 ± 0.20 µg CH4 -C/m2/h) vs. the control plots (31.08 ± 3.50 µg N2O-N/m2/h, -7.30 ± 0.19 µg CH4 -C/m2/h) could be observed, while there was no significant difference in the fluxes of CO2. However, it could be observed that N2O emissions were significantly lower from the biochar amended plots during periods with low emission rates (< 50 µg N2O-N/m2/h). Only during an extremely high emission event following heavy rainfall N2O emissions from the biochar amended plots were higher than from the control plots. Our results demonstrate that pastures on ferrosols in Northern NSW are a significant source of GHG and that the amendment of biochar can alter those emissions. However, more field and laboratory incubation studies covering prolonged observation periods are needed to clarify the impact of biochar amendment on soil microbial processes and the emission of soil-borne GHGs.
pp. 199-201, 2010, (Gilkes, R.J, Prakongkep, N. (Eds.). Proceedings 19th World Congress of Soil Science 2010; Published on DVD; http://www.iuss.org; Congress Symposium 4; Greenhouse gases from soils, IUSS, Brisbane, pp. 199-201.).
@article{Rowlings2010b,
title = {Quantifying N_{2}O and CO_{2} emissions from a subtropical pasture},
author = {David Rowlings and Peter R. Grace and Ralf Kiese and Clemens Scheer},
url = {http://soilscienceaustralia.com.au/19th-world-congress-of-soil-science},
year = {2010},
date = {2010-08-01},
pages = {199-201},
abstract = {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 a threshold for soil conditions favouring denitrification. The use of automatic chambers for high resolution greenhouse gas sampling can greatly reduce emission estimation errors associated with temperature and WFPS changes.},
note = {Gilkes, R.J, Prakongkep, N. (Eds.). Proceedings 19th World Congress of Soil Science 2010; Published on DVD; http://www.iuss.org; Congress Symposium 4; Greenhouse gases from soils, IUSS, Brisbane, pp. 199-201.},
keywords = {Improved process understanding and new technologies},
pubstate = {published},
tppubtype = {article}
}
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 a threshold for soil conditions favouring denitrification. The use of automatic chambers for high resolution greenhouse gas sampling can greatly reduce emission estimation errors associated with temperature and WFPS changes.
