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Published online 17 July 2007
Published in J Environ Qual 36:1241-1248 (2007)
DOI: 10.2134/jeq2006.0237
© 2007 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Methane Oxidation in Freely and Poorly Drained Grassland Soils and Effects of Cattle Urine Application

Zheng Li* and Francis M. Kelliher

Manaaki Whenua-Landcare Research, P.O. Box 40, Lincoln 7640, New Zealand


Figure 1
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  		Fig. 1. Methane oxidation rates measured by static chambers, soil temperature, soil water-filled pore space (WFPS), daily rainfall, soil ammonium (NH4+), and nitrate (NO3–) contents. Error bars are ± 1 SD.

 

Figure 2
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  		Fig. 2. Methane concentrations in the soil's pore space. Error bars are ± 1 SD.

 

Figure 3
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  		Fig. 3. Soil pore space methane concentrations in the Control plots on three occasions (days) after urine application. Error bars are ± 1 SD.

 

Figure 4
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  		Fig. 4. Methane oxidation rates by gas gradient (CH4 concentrations between 75- and 150-mm depths) and chamber methods. Gradient: DCH4, soil (T) is estimated by Eq. [3] with a = 0.9 and b = 2.3; Error bars are ± 1 SD.

 

Figure 5
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  		Fig. 5. Relationship of methane oxidation rate and soil water-filled pore space (WFPS, measured at 100-mm depth) in the Control of the poorly drained soil. Error bars are ± 1 SD.

 

Figure 6
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  		Fig. 6. Comparison of methane oxidation rates by gas gradient (CH4 concentrations between 75- and 150-mm depths) and chamber methods in the Control plots.

 




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Copyright © 2007 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.