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United States Department of Agriculture

Agricultural Research Service

Title: Particulate and Biologically Active Soil Carbon Pools under Grazed and Ungrazed Bermudagrass in the Southern Piedmont Usa

Authors
item Franzluebbers, Alan
item Franzluebbers, Alan
item Stuedemann, John
item Stuedemann, John

Submitted to: Soil Ecology Meeting Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: May 20, 2001
Publication Date: May 20, 2001
Citation: Franzluebbers, A.J., Stuedemann, J.A. 2001. Particulate and biologically active soil carbon pools under grazed and ungrazed bermudagrass in the Southern Piedmont USA. Soil Ecology Meeting Abstracts.

Technical Abstract: The effect of forage management strategies on carbon cycling is of importance to the understanding of greenhouse gas emissions, agronomic productivity, and changes in soil quality. Particulate organic C (POC), soil microbial biomass C (SMBC), and potential C mineralization (CMIN) were evaluated during 4 years in response to N fertilization [inorganic only, crimson clover (Trifolium incarnatum L.) cover crop plus inorganic, and broiler litter] and forage harvest strategy (unharvested, low and high grazing pressure, and hayed). Accumulation of POC, SMBC, and CMIN with time was greatest at a depth of 0 to 2 cm and not different among fertilization strategies. To a depth of 6 cm, POC accumulated at a rate of 65 to 73 g/m2/yr under unharvested or hayed strategies and at a rate of 136 to 144 g/m2/yr under cattle grazing strategies. Accumulation rate of SMBC was also dependent upon forage utilization intensity, averaging 5.1, 9.6, 11.9, and 7.4 g/m2/yr under unharvested, low grazing pressure, high grazing pressure, and hayed strategies, respectively. Particulate and biologically active soil C pools improved under all forage management strategies, although with cattle grazing the rate of improvement nearly doubled compared with an unharvested strategy.

Submitted to: Soil Ecology Meeting Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: May 20, 2001
Publication Date: May 20, 2001
Citation: Franzluebbers, A.J., Stuedemann, J.A. 2001. Particulate and biologically active soil carbon pools under grazed and ungrazed bermudagrass in the Southern Piedmont USA. Soil Ecology Meeting Abstracts.

Technical Abstract: The effect of forage management strategies on carbon cycling is of importance to the understanding of greenhouse gas emissions, agronomic productivity, and changes in soil quality. Particulate organic C (POC), soil microbial biomass C (SMBC), and potential C mineralization (CMIN) were evaluated during 4 years in response to N fertilization [inorganic only, crimson clover (Trifolium incarnatum L.) cover crop plus inorganic, and broiler litter] and forage harvest strategy (unharvested, low and high grazing pressure, and hayed). Accumulation of POC, SMBC, and CMIN with time was greatest at a depth of 0 to 2 cm and not different among fertilization strategies. To a depth of 6 cm, POC accumulated at a rate of 65 to 73 g/m2/yr under unharvested or hayed strategies and at a rate of 136 to 144 g/m2/yr under cattle grazing strategies. Accumulation rate of SMBC was also dependent upon forage utilization intensity, averaging 5.1, 9.6, 11.9, and 7.4 g/m2/yr under unharvested, low grazing pressure, high grazing pressure, and hayed strategies, respectively. Particulate and biologically active soil C pools improved under all forage management strategies, although with cattle grazing the rate of improvement nearly doubled compared with an unharvested strategy.

Last Modified: 10/30/2014
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