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Modeling plant structure and its impacts on carbon and water cycles of the Central Asian arid ecosystem in the context of climate change

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  • Zhang, Chi
  • Li, Chaofan
  • Luo, Geping
  • Chen, Xi

Abstract

The effect of the rapid climate change observed in recent decades on the carbon (C) dynamics of the Central Asian dryland remains unclear. The special root structure of desert plants, the non-uniform canopy structure of the dryland ecosystem, and the intensive root–water interaction in the groundwater–soil–plant continuum are important characteristics of dryland ecosystems that could affect the C and water processes in Central Asia. However, these characteristics of dryland ecosystems have not been adequately addressed by the current ecosystem models. In this study, a process-based arid ecosystem model (AEM) was developed to model plant and canopy structures and their effects on the coupled C and water processes in dryland ecosystems. In comparison to other models, the AEM includes an improved vertical root distribution submodel, a detailed mechanistic submodel for the root water uptake, a photodegradation submodel, and a plant form submodel that dynamically updates a plant's aboveground structure and canopy coverage daily. The AEM was parameterized for the major plant functional types (PFTs) in Central Asia, and its performance was evaluated by conducting sensitivity analyses and model validations against field observations. The model accurately predicted the water and C pulses in response to abrupt precipitation events. The numerical experiments indicated that (1) Central Asian dryland ecosystems could respond promptly to changes in climate and groundwater fluctuation, and (2) different PFTs have different sensitivities to environmental changes because of their different plant structures and physiologies. This study showed that a process-based model, such as the AEM, can be useful in studying the complex interactions between plants and their water-stressed environment in the context of the rapid climate change in Central Asia.

Suggested Citation

  • Zhang, Chi & Li, Chaofan & Luo, Geping & Chen, Xi, 2013. "Modeling plant structure and its impacts on carbon and water cycles of the Central Asian arid ecosystem in the context of climate change," Ecological Modelling, Elsevier, vol. 267(C), pages 158-179.
  • Handle: RePEc:eee:ecomod:v:267:y:2013:i:c:p:158-179
    DOI: 10.1016/j.ecolmodel.2013.06.008
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    References listed on IDEAS

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    1. Sepaskhah, A. R. & Kanooni, A. & Ghasemi, M. M., 2003. "Estimating water table contributions to corn and sorghum water use," Agricultural Water Management, Elsevier, vol. 58(1), pages 67-79, January.
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    Cited by:

    1. Chaofan Li & Qifei Han & Geping Luo & Chengyi Zhao & Shoubo Li & Yuangang Wang & Dongsheng Yu, 2018. "Effects of Cropland Conversion and Climate Change on Agrosystem Carbon Balance of China’s Dryland: A Typical Watershed Study," Sustainability, MDPI, vol. 10(12), pages 1-16, November.
    2. Qidong Yang & Hongchao Zuo & Weidong Li, 2016. "Land Surface Model and Particle Swarm Optimization Algorithm Based on the Model-Optimization Method for Improving Soil Moisture Simulation in a Semi-Arid Region," PLOS ONE, Public Library of Science, vol. 11(3), pages 1-17, March.
    3. Zhu, Shihua & Fang, Xia & Cao, Liangzhong & Hang, Xin & Xie, Xiaoping & Sun, Liangxiao & Li, Yachun, 2023. "Multivariate drives and their interactive effects on the ratio of transpiration to evapotranspiration over Central Asia ecosystems," Ecological Modelling, Elsevier, vol. 478(C).
    4. Li, Chaofan & Zhang, Chi & Luo, Geping & Chen, Xi, 2013. "Modeling the carbon dynamics of the dryland ecosystems in Xinjiang, China from 1981 to 2007—The spatiotemporal patterns and climate controls," Ecological Modelling, Elsevier, vol. 267(C), pages 148-157.
    5. Peng Cai & Chaofan Li & Geping Luo & Chi Zhang & Friday Uchenna Ochege & Steven Caluwaerts & Lesley De Cruz & Rozemien De Troch & Sara Top & Piet Termonia & Philippe De Maeyer, 2020. "The Responses of the Ecosystems in the Tianshan North Slope under Multiple Representative Concentration Pathway Scenarios in the Middle of the 21st Century," Sustainability, MDPI, vol. 12(1), pages 1-19, January.
    6. Fang, Xia & Chen, Zhi & Guo, Xulin & Zhu, Shihua & Liu, Tong & Li, Chaofan & He, Biao, 2019. "Impacts and uncertainties of climate/CO2 change on net primary productivity in Xinjiang, China (2000–2014): A modelling approach," Ecological Modelling, Elsevier, vol. 408(C), pages 1-1.

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