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Increased microbial activity under elevated [CO2] does not enhance residue decomposition in a semi-arid cropping system in Australia |
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| Institution: | 1. Postdoctoral Fellow, Dept. Ag, Nutrition, and Vet. Sciences, University of Nevada-Reno, Reno, NV 89557, USA;2. Professor, Agron. and Hort. Dept., University of Nebraska-Lincoln, Lincoln, NE 68583, USA;3. Professor, University of Nebraska-Lincoln, West Central Research and Extension Center, North Platte, NE 69101, USA;4. Professor, Dept. of Statistics, University of Nebraska-Lincoln;5. Extension Educator, University of Nebraska-Lincoln, Ainsworth, NE 69210, USA |
| Abstract: | The association between the responses of microbial activity and residue decomposition to elevated atmospheric CO2] under field conditions in Australian cropping systems is unknown. We measured soil CO2 emission and decomposition of wheat and field pea residues in a wheat cropping system in the field using the Australian Grains Free-Air CO2 Enrichment (AGFACE) facility in Horsham, Victoria. Elevated CO2] (550 μmol mol−1) increased soil CO2 emission by 41%, but did not affect the percentage of the original mass or C remaining for either type of residue throughout the experimental period. Our findings suggest that the rates of residue decomposition and residue C mineralization in this semi-arid wheat cropping system were not affected by elevated CO2] despite higher microbial activity. This has major implication for the C sequestration potential of semi-arid cropping systems under future CO2 climates. |
| Keywords: | Soil respiration Residue decomposition Microbial activity Semi-arid cropping system Carbon sequestration |
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