Evaluation of a model framework to estimate soil and soil organic carbon redistribution by water and tillage using 137Cs in two U.S. Midwest agricultural fields

摘要: Abstract Cultivated lands in the U.S. Midwest have been affected by soil erosion, causing organic carbon (SOC) redistribution landscape and other environmental agricultural problems. The importance of SOC on productivity crop yield, however, is still uncertain. In this study, we used a model framework, which includes Unit Stream Power-based Erosion Deposition (USPED) Tillage Prediction (TEP) models, to understand caused water tillage erosion two fields Midwest. This framework was evaluated for different digital elevation (DEM) spatial resolutions (10-m, 24-m, 30-m, 56-m) topographic exponents (m = 1.0–1.6 n = 1.0–1.3) using rates from 137Cs measurements. results showed that aggregated 24-m DEM, m = 1.4 n = 1.0 rill m = 1.0 sheet provided best fit with observation data at both sites. Moreover, estimated average redistributions were 1.3 ± 9.8 g C m− 2 yr− 1 field site 1 3.6 ± 14.3 g 2. Spatial distribution patterns loss (negative values) eroded areas gain (positive value) deposition areas. study demonstrated resolution estimate map dynamics throughout landscape, helping identify places where are occurring high rates. Additional research needed improve application use local regional studies rainfall erosivity cover management factors vary. Therefore, can help information about across landscapes better understanding within eroding previously fields.