Journal
ENVIRONMENTAL MODELLING & SOFTWARE
Volume 102, Issue -, Pages 39-48Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envsoft.2018.01.005
Keywords
Agriculture; Greenhouse gases; Erosion; Soil organic carbon
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Funding
- NASA [NNX17AE66G]
- USDA Interagency carbon cycle science program [2017-67003-26485, 2017-67003-26484]
- NASA's New Investigator Award [NNH13ZDA001N]
- NSF INFEWS [1639327]
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The soil erosion and associated lateral movement of eroded carbon (C) have been identified as a possible mechanism explaining the elusive terrestrial C sink of ca. 1.7-2.6 PgC yr(-1). Here we evaluated the SWAT-C model for simulating long-term soil erosion and associated eroded C yields. Our method couples the CENTURY carbon cycling processes with a Modified Universal Soil Loss Equation (MUSLE) to estimate C losses associated with soil erosion. The results show that SWAT-C is able to simulate well long-term average eroded C yields, as well as correctly estimate the relative magnitude of eroded C yields by crop rotations. We also evaluated three methods of calculating C enrichment ratio in mobilized sediments, and found that errors associated with enrichment ratio estimation represent a significant uncertainty in SWAT-C simulations. Furthermore, we discussed limitations and future development directions for SWAT-C to advance C cycling modeling and assessment. (c) 2018 Elsevier Ltd. All rights reserved.
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