141. Nitrification inhibitors to reduce N2O emissions from Australian farming systems

• Authors:
  • Li, H.
  • Chen, D.
  • Suter, H.
• Source: The CCRSPI Conference
• Year: 2011

142. A field study on the impact of the nitrification inhibitor DMPP on N2O emissions from a pasture in south western Victoria

• Authors:
  • Chen, D.
  • Mahoney, M.
  • Davies, R.
  • Sultana, H.
  • Suter, H.
• Source: The CCRSPI Conference
• Year: 2011

143. Greenhouse gas fluxes from an Australian subtropical cropland under long-term contrasting management regimes

• Authors:
  • Kiese, R.
  • Butterbach-Bahl, K.
  • Reeves, S. H.
  • Dalal, R. C.
  • Wang, W.
• Source: Global Change Biology
• Volume: 17
• Issue: 10
• Year: 2011

144. Spatial uncertainty of (137)Cs-derived net (1950s-1990) soil

• Authors:
  • Loughran, R.
  • Chappell, A.
  • Rossel, R. A. V.
• Source: Journal of Geophysical Research - Earth Surface
• Volume: 116
• Year: 2011

145. Bioenergy in Australia: An improved approach for estimating spatial availability of biomass resources in the agricultural production zones

• Authors:
  • Herr, A.
  • Dunlop, M.
• Source: Biomass and Bioenergy
• Volume: 35
• Issue: 5
• Year: 2011

146. Field-based measurements of sulfur gas emissions from an agricultural coastal acid sulfate soil, eastern Australia

• Authors:
  • Denmead,O. Tom
  • Kinsela,Andrew S.
  • Reynolds,Jason K.
  • Melville,Michael D.
  • Macdonald,Bennett C. T.
  • White,Ian
• Source: Soil Research
• Volume: 49
• Issue: 6
• Year: 2011

147. Does the adoption of zero tillage reduce greenhouse gas emissions? An assessment for the grains industry in Australia

• Authors:
  • Cockfield, G.
  • Maraseni, T. N.
• Source: Agricultural Systems
• Volume: 104
• Issue: 6
• Year: 2011

148. Understand distribution of carbon dioxide to interpret crop growth data: Australian grains free-air carbon dioxide enrichment experiment

• Authors:
  • Mollah, M.
  • Partington, D.
  • Fitzgerald, G.
• Source: Crop and Pasture Science
• Volume: 62
• Issue: 10
• Year: 2011
• Summary: Carbon dioxide (CO2) is the most important greenhouse gas, predicted to increase globally from currently 386 to 550 μmol mol–1 by 2050 and cause significant stimulation to plant growth. Consequently, in 2007 and 2008, Australian grains free-air carbon dioxide enrichment (AGFACE) facilities were established at Horsham (36°45′07″S lat., 142°06′52″E long., 127 m elevation) and Walpeup (35°07′20″S lat., 142°00′18″E long., 103 m elevation) in Victoria, Australia to investigate the effects of elevated CO2, water supply and nitrogen fertiliser on crop growth. Understanding the distribution patterns of CO2 inside AGFACE rings is crucial for the interpretation of the crop growth data. In the AGFACE system, the engineering performance goal was set as having at least 80% of the ring area with a CO2 concentration [CO2] at or above 90% of the target concentration at the ring-centre for 80% of the time. The [CO2] was highly variable near the ring-edge where CO2 is emitted and declined non-linearly with the distance downwind and wind speeds. Larger rings maintained the target [CO2] of 550 μmol mol–1 at the ring-centres better than the smaller rings. The spatial variation of [CO2] depended on ring size and the gap between fumigation and canopy heights but not on wind speeds. The variations in the inner 80% of the rings were found to be higher in smaller rings, implying that the larger rings had more areas of relatively uniform [CO2] to conduct experiments.

149. Soil organic carbon and total nitrogen under Leucaena leucocephala pastures in Queensland

• Authors:
  • Shelton, H. M.
  • Radrizzani, A.
  • Kirchhof, G.
  • Dalzell, S. A.
• Source: Crop and Pasture Science
• Volume: 62
• Issue: 4
• Year: 2011
• Summary: Soil organic carbon (OC) and total nitrogen (TN) accumulation in the top 0–0.15 m of leucaena–grass pastures were compared with native pastures and with continuously cropped land. OC and TN levels were highest under long-term leucaena–grass pasture (P < 0.05). For leucaena–grass pastures that had been established for 20, 31, and 38 years, OC accumulated at rates that exceeded those of the adjacent native grass pasture by 267, 140, and 79 kg/ha.year, respectively, while TN accumulated at rates that exceeded those of the native grass pastures by 16.7, 10.8, and 14.0 kg/ha.year, respectively. At a site where 14-year-old leucaena–grass pasture was adjacent to continuously cropped land, there were benefits in OC accumulation of 762 kg/ha.year and in TN accumulation of 61.9 kg/ha.year associated with the establishment of leucaena–grass pastures. Similar C : N ratios (range 12.7–14.5) of soil OC in leucaena and grass-only pastures indicated that plant-available N limited soil OC accumulation in pure grass swards. Higher OC accumulation occurred near leucaena hedgerows than in the middle of the inter-row in most leucaena–grass pastures. Rates of C sequestration were compared with simple models of greenhouse gas (GHG) emissions from the grazed pastures. The amount of carbon dioxide equivalent (CO2-e) accumulated in additional topsoil OC of leucaena–grass pastures ≤20 years old offset estimates of the amount of CO2-e emitted in methane and nitrous oxide from beef cattle grazing these pastures, thus giving positive GHG balances. Less productive, aging leucaena pastures >20 years old had negative GHG balances; lower additional topsoil OC accumulation rates compared with native grass pastures failed to offset animal emissions

150. Optimal Fire Regimes for Soil Carbon Storage in Tropical Savannas of Northern Australia

• Authors:
  • Richards, A. E.
  • Cook, G. D.
  • Lynch, B. T.
• Source: Ecosystems
• Volume: 14
• Issue: 3
• Year: 2011