Comparison of soil microbial respiration and carbon turnover under perennial and annual biofuel crops in two agricultural soils

Laura Melissa Szymanski1, Erika Marin-Spiotta1, Gregg R Sanford2, Randall D Jackson2,3 and Katherine A Heckman4, (1)University of Wisconsin Madison, Madison, WI, United States, (2)University of Wisconsin- Madison, Wisconsin Energy Institute, Madison, United States, (3)University of Wisconsin- Madison, Agronomy, Madison, United States, (4)Lawrence Livermore National Laboratory, Center for Accelerator Mass Spectrometry, Livermore, CA, United States