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Contribution of Urine and Dung Patches from Grazing Sheep to Methane and Carbon Dioxide Fluxes in an Inner Mongolian Desert Grassland

  • Jiang, Yuanyuan (College of Ecology and Environment, Inner Mongolia Agricultural University) ;
  • Tang, Shiming (College of Ecology and Environment, Inner Mongolia Agricultural University) ;
  • Wang, Chengjie (College of Ecology and Environment, Inner Mongolia Agricultural University) ;
  • Zhou, Pei (College of Ecology and Environment, Inner Mongolia Agricultural University) ;
  • Tenuta, Mario (Department of Soil Science, University of Manitoba) ;
  • Han, Guodong (College of Ecology and Environment, Inner Mongolia Agricultural University) ;
  • Huang, Ding (Institute of Grassland Science, China Agricultural University)
  • Received : 2011.08.04
  • Accepted : 2011.11.06
  • Published : 2012.02.01

Abstract

The effects of sheep urine and dung patches on methane ($CH_4$) and carbon dioxide ($CO_2$) fluxes were investigated during the summer-autumn in 2010, to evaluate their contribution to climate change in a desert grassland in Inner Mongolia, China. Results indicate that the cumulative $CH_4$ emissions for dung patches, urine patches and control plots were -0.076, -0.084, and -0.114 g/$m^2$ and these were net $CH_4$ sinks during the measured period. The level of $CH_4$ intake from urine and dung plots decreased 25.7%, and 33.3%, respectively, compared with a control plot. $CO_2$ fluxes differed (p<0.01) in urine plots, with an average of 569.20 mg/$m^2$/h compared with control plots (357.62 mg/$m^2$/h) across all sampling days. Dung patches have cumulative $CO_2$ emissions that were 15.9% higher compared with the control during the 55-d period. Overall, sheep excrement weakened $CH_4$ intake and increased $CO_2$ emissions.

Keywords

References

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