Soil Gas Efflux in Perennial Bioenergy and Conventional Agricultural Crops in the Lower Mississippi Alluvial Valley
2018
Moore, Leah M. | Blazier, Michael A. | Dodla, Syam | Wang, Jim | Liechty, Hal O.
The Lower Mississippi Alluvial Valley (LMAV) has favorable attributes for producing biofuels. Two study sites were established on retired agricultural fields in the LMAV to explore switchgrass (SWITCH) and eastern cottonwood (CTWD) as biofuel feedstocks. A soybean-sorghum rotation (CROP) was also established as a conventional cropping system. Soil efflux gas (carbon dioxide [CO₂], methane [CH₄], and nitrous oxide [N₂O]), microbial biomass carbon (Cₘᵢc) and dehydrogenase activity were measured for two years. Cumulative growing-season soil CO₂ efflux of SWITCH exceeded that of CROP; SWITCH had higher daily CO₂ efflux than CTWD and CROP in some months. SWITCH and CTWD had greater Cₘᵢc than CROP at both sites. Soil CH₄ and N₂O efflux rates were low for much of the study, with only short-term differences in soil CH₄ observed. Converting these retired agricultural sites to SWITCH increased soil CO₂ efflux relative to CROP, with increases attributable to greater plant and microbial respiration.
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