2022 Early Hearing Detection & Intervention Virtual Conference

March 13 - 15, 2022

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5/23/2019 | 11:15 AM - 11:30 AM | SOY-BASED DENITRIFICATION POTENTIAL: CROP LITTER TRANSPORT, BREAKDOWN AND ASSOCIATED BIOGEOCHMEICAL PROCESSES IN MISSISSIPPI DELTA FRESHWATER AGROECOSYSTEMS | 254 B

SOY-BASED DENITRIFICATION POTENTIAL: CROP LITTER TRANSPORT, BREAKDOWN AND ASSOCIATED BIOGEOCHMEICAL PROCESSES IN MISSISSIPPI DELTA FRESHWATER AGROECOSYSTEMS

Freshwater ecosystem function in agricultural landscapes is likely influenced by crop-derived detritus entering freshwater habitats. We estimated litter transport and breakdown rates of soybean litter within a stream bayou located within the Lower Mississippi River Basin (LMBR). Additionally, we performed sediment core incubations with and without soybean litter bags collected from the bayou over time to estimate effects of soybean litter on respiration and denitrification rates throughout the decomposition process. Preliminary results indicate that: 1) soybean detritus entered aquatic habitats from late October through December; 2) detritus decomposed rapidly with most of the material gone in 48 days; and 3) detritus increased respiration and denitrification rates above background sediment rates during the decomposition process. Our results document transport of soybean litter into freshwater habitats and confirm that this labile material can contribute to the timing and magnitude of low dissolved oxygen impacts associated with post-harvest conditions. However, soybean litter also enhances the potential for bayou habitats to remove excess N by stimulating denitrification as surface water moves through low-gradient drainage networks typical of the LMRB landscape.

Decomposition
Carbon
Oxygen

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Presenters/Authors

Jason M. Taylor (), USDA, Agricultural Research Service, National Sedimentation Lab, jason.taylor@ars.usda.gov;