Simulating soil organic carbon dynamics as affected by different water erosion scenarios and grazing management in semi-arid rangelands of Bajgah using the Century model

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Azad b.; AFZALI S.F.

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Journal: Journal of Soil Management and Sustainable Production Year:2020 | Volume:9 | Issue:4 Page(s): 69-87

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Title

Simulating soil organic carbon dynamics as affected by different water erosion scenarios and grazing management in semi-arid rangelands of Bajgah using the Century model

Author(s)

Azad b. | AFZALI S.F. | Issue Writer Certificate

Keywords

Carbon SequestrationQ1

Global WarmingQ1

Soil Carbon ModelingQ1

Soil Organic Carbon StockQ1

Water Erosion ModelsQ1

Abstract

Background and Objectives: The carbon displacement caused by water erosion stated as an important factor affecting the concentration of CO2 in the atmosphere. Since evaluating the impact of water erosion on soil organic carbon (SOC) stock dynamic in long-term is difficult without modeling tool and given that rangelands of Iran have taken a large part of the country, modeling the effect of water erosion on SOC dynamics in rangelands can provide appropriate management solutions for related organizations. Therefore, the present study aims to: 1) improve the performance of the Century model as the most widely used model in the soil carbon studies, by using the output of three Water Erosion Models of GLEAMS, WEPP and ANSWERS and 2) simulating the SOC stock dynamic under the influence of two erosion scenarios in the semi-arid rangelands of Bajgah (Southern Iran). Materials and Methods: After the parameterization and calibrating the Century model the longterm average of water erosion rate simulated by WEPP, GLEAMS and ANSWERS erosion models entered as input in the Century model. Finally, a water erosion model, that its simulated erosion rate improves the validation results of the Century model, was selected and then illustrated the effect of two water erosion scenarios including occurrence of water erosion and non-occurrence of water erosion on the changes of SOC stock for two periods of grazing management including moderate grazing management (period of II/1964-1979) and no grazing management (period of III/1980-2014) in the study region. Results: The results showed that use of the GLEAMS model output made the Century model with more accurately predict SOC stock and the output of this erosion model was used for simulate the SOC stock variations under the influence of water erosion in the Century model. The simulation results of the Century model showed that in the no-erosion scenario in semi-arid rangelands of Bajgah during the II period with moderate intensity of grazing, the SOC stock trend with a large slope of 3496 g m-2 in 1964 has fallen to 3260. 93 g m-2 in 1979 and in the III period, with no grazing management, SOC stock with a gradient slope of 355. 36 g m-2 at the end of 2014 has reached. In the water erosion scenario, during the II period, the SOC stock with a large slope of 3496 g m-2 in 1964 decreased to 3243/90 g m-2 at the end of 1979 and in the III period, the SOC stock with a gradient slope of 3350. 42 g m-2 at the end of 2014 has reached. The simulation results also showed that the SOC stock in the erosion scenario compared to the no-erosion scenario at the end of periods II and III has decreased by 0. 52% and 0. 16%, respectively. Conclusion: Generally, in the semi-arid rangelands of Bajgah, the effect of erosion on the SOC stock was very negligible and grazing management plays an important role in the SOC stock changes.

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APA: Copy

Azad, b., & AFZALI, S.F.. (2020). Simulating soil organic carbon dynamics as affected by different water erosion scenarios and grazing management in semi-arid rangelands of Bajgah using the Century model. ELECTRONIC JOURNAL OF SOIL MANAGEMENT AND SUSTAINABLE PRODUCTION, 9(4 ), 69-87. SID. https://sid.ir/paper/209677/en

Vancouver: Copy

Azad b., AFZALI S.F.. Simulating soil organic carbon dynamics as affected by different water erosion scenarios and grazing management in semi-arid rangelands of Bajgah using the Century model. ELECTRONIC JOURNAL OF SOIL MANAGEMENT AND SUSTAINABLE PRODUCTION[Internet]. 2020;9(4 ):69-87. Available from: https://sid.ir/paper/209677/en

IEEE: Copy

b. Azad, and S.F. AFZALI, “Simulating soil organic carbon dynamics as affected by different water erosion scenarios and grazing management in semi-arid rangelands of Bajgah using the Century model,” ELECTRONIC JOURNAL OF SOIL MANAGEMENT AND SUSTAINABLE PRODUCTION, vol. 9, no. 4 , pp. 69–87, 2020, [Online]. Available: https://sid.ir/paper/209677/en

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