Abstract
As root water uptake (RWU) is an important link in the water and heat exchange between plants and ambient air, improving its parameterization is key to enhancing the performance of land surface model simulations. Although different types of RWU functions have been adopted in land surface models, there is no evidence as to which scheme most applicable to maize farmland ecosystems. Based on the 2007–09 data collected at the farmland ecosystem field station in Jinzhou, the RWU function in the Common Land Model (CoLM) was optimized with scheme options in light of factors determining whether roots absorb water from a certain soil layer (Wx) and whether the baseline cumulative root efficiency required for maximum plant transpiration (Wc) is reached. The sensibility of the parameters of the optimization scheme was investigated, and then the effects of the optimized RWU function on water and heat flux simulation were evaluated. The results indicate that the model simulation was not sensitive to Wx but was significantly impacted by Wc. With the original model, soil humidity was somewhat underestimated for precipitation-free days; soil temperature was simulated with obvious interannual and seasonal differences and remarkable underestimations for the maize late-growth stage; and sensible and latent heat fluxes were overestimated and underestimated, respectively, for years with relatively less precipitation, and both were simulated with high accuracy for years with relatively more precipitation. The optimized RWU process resulted in a significant improvement of CoLM’s performance in simulating soil humidity, temperature, sensible heat, and latent heat, for dry years. In conclusion, the optimized RWU scheme available for the CoLM model is applicable to the simulation of water and heat flux for maize farmland ecosystems in arid areas.
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We would like to thank the two anonymous reviewers for their insightful and detailed comments and suggestions. We also extend our gratitude to the editors for their efforts in improving this paper.
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Supported by the National Natural Science Foundation of China (41305058), Cultivation Plan for Young Agricultural Science and Technology Talents of Liaoning Province (2015060 and 2014060), and Key Agricultural Science and Industrialization Project of the Science and Technology Department of Liaoning Province (2014210003).
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Cai, F., Ming, H., Mi, N. et al. Effects of optimized root water uptake parameterization schemes on water and heat flux simulation in a maize agroecosystem. J Meteorol Res 31, 363–377 (2017). https://doi.org/10.1007/s13351-017-6037-2
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DOI: https://doi.org/10.1007/s13351-017-6037-2