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Modeling watershed carbon dynamics as affected by land cover change and soil erosion

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  • Liu, Jinxun
  • Sleeter, Benjiamin
  • Selmants, Paul C.
  • Diao, Jiaojiao
  • Zhou, Qiang
  • Worstell, Bruce
  • Moritsch, Monica

Abstract

Process-based ecosystem carbon cycle models typically incorporate vegetation growth, vegetation mortality, and soil respiration as well as the biotic and environmental drivers that influence these variables. However, few spatially explicit process models can efficiently incorporate the influence of land cover change and carbon lateral movement at regional scales or high spatial resolution. This study uses the Land Use and Carbon Scenario Simulator (LUCAS) to demonstrate the development of a fast ecosystem model that not only considers the basic carbon cycle but also incorporates the impact of land cover change, soil erosion, and soil deposition. As input to the LUCAS modeling framework, we used the integrated biosphere simulator (IBIS) to simulate a non-spatial reference carbon cycling scenario without considering land cover change for the Nisqually River watershed in the northwestern United States. We then used the Land Change Monitoring, Assessment, and Projection (LCMAP) remotely sensed 30-m sequential land cover data to generate annual land change history for the Nisqually River area from 1985 to 2017 and used the Unit Stream Powered Erosion and Deposition model (USPED) to estimate annual soil carbon lateral movement. Finally, we combined the annual carbon outputs from IBIS, the land change history from LCMAP, and the soil erosion and deposition from USPED within the LUCAS simulation framework. Results showed that from 1985 to 2017, along with the dynamic land cover changes, total ecosystem biomass carbon increased from 11.4 to 18.6 TgC, mainly due to forest growth. Total ecosystem soil carbon declined from 31.7 to 29.7 TgC, but the overall loss in soil carbon was not uniform across land cover types. Forestland (forest sector) and grassland lost carbon, while wetland, developed land and agricultural land gained carbon. Forest, grassland, and developed land lost 0.0553 TgC during the study period (1.73 Gg of C per year; 1 Gg = 0.001 Tg) from erosion, while wetland gained 0.0071 TgC (0.22 Gg C per year) from deposition. Agricultural land was neutral in terms of soil erosion.

Suggested Citation

  • Liu, Jinxun & Sleeter, Benjiamin & Selmants, Paul C. & Diao, Jiaojiao & Zhou, Qiang & Worstell, Bruce & Moritsch, Monica, 2021. "Modeling watershed carbon dynamics as affected by land cover change and soil erosion," Ecological Modelling, Elsevier, vol. 459(C).
    • Handle: RePEc:eee:ecomod:v:459:y:2021:i:c:s0304380021002787
    DOI: 10.1016/j.ecolmodel.2021.109724
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    References listed on IDEAS

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    1. Liu, Jinxun & Vogelmann, James E. & Zhu, Zhiliang & Key, Carl H. & Sleeter, Benjamin M. & Price, David T. & Chen, Jing M. & Cochrane, Mark A. & Eidenshink, Jeffery C. & Howard, Stephen M. & Bliss, Nor, 2011. "Estimating California ecosystem carbon change using process model and land cover disturbance data: 1951–2000," Ecological Modelling, Elsevier, vol. 222(14), pages 2333-2341.
    2. Adrian Chappell & Jeffrey Baldock & Jonathan Sanderman, 2016. "The global significance of omitting soil erosion from soil organic carbon cycling schemes," Nature Climate Change, Nature, vol. 6(2), pages 187-191, February.
    3. Liu, Jinxun & Liu, Shuguang & Loveland, Thomas R. & Tieszen, Larry L., 2008. "Integrating remotely sensed land cover observations and a biogeochemical model for estimating forest ecosystem carbon dynamics," Ecological Modelling, Elsevier, vol. 219(3), pages 361-372.
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    Cited by:

    1. Katusiime, Juliet & Schütt, Brigitta & Mutai, Noah, 2023. "The relationship of land tenure, land use and land cover changes in Lake Victoria basin," Land Use Policy, Elsevier, vol. 126(C).
    2. Walter Chen & Wu-Hsun Wang & Kieu Anh Nguyen, 2022. "Soil Erosion and Deposition in a Taiwanese Watershed Using USPED," Sustainability, MDPI, vol. 14(6), pages 1-17, March.
    3. Chasia, Stanley & Olang, Luke O. & Sitoki, Lewis, 2023. "Modelling of land-use/cover change trajectories in a transboundary catchment of the Sio-Malaba-Malakisi Region in East Africa using the CLUE-s model," Ecological Modelling, Elsevier, vol. 476(C).

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