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Title: Simulating eroded soil organic carbon with the SWAT-C model

Abstract

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.

Authors:
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1455310
Report Number(s):
PNNL-SA-135494
Journal ID: ISSN 1364-8152
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Environmental Modelling and Software
Additional Journal Information:
Journal Volume: 102; Journal Issue: C; Journal ID: ISSN 1364-8152
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
Agriculture; Greenhouse gases; Erosion; Soil organic carbon; WATER ASSESSMENT-TOOL; SPATIAL VARIABILITY; SEDIMENT TRANSPORT; MATTER DYNAMICS; SLOPE POSITION; EROSION MODEL; CYCLE; BUDGET; CROP; RUNOFF

Citation Formats

Zhang, Xuesong. Simulating eroded soil organic carbon with the SWAT-C model. United States: N. p., 2018. Web. doi:10.1016/j.envsoft.2018.01.005.
Zhang, Xuesong. Simulating eroded soil organic carbon with the SWAT-C model. United States. doi:10.1016/j.envsoft.2018.01.005.
Zhang, Xuesong. Sun . "Simulating eroded soil organic carbon with the SWAT-C model". United States. doi:10.1016/j.envsoft.2018.01.005.
@article{osti_1455310,
title = {Simulating eroded soil organic carbon with the SWAT-C model},
author = {Zhang, Xuesong},
abstractNote = {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.},
doi = {10.1016/j.envsoft.2018.01.005},
journal = {Environmental Modelling and Software},
issn = {1364-8152},
number = C,
volume = 102,
place = {United States},
year = {2018},
month = {4}
}