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Comment on Aureli et al. Review of Historical Dam-Break Events and Laboratory Tests on Real Topography for the Validation of Numerical Models. Water 2021, 13, 1968
Article

Scaling Up from Leaf to Whole-Plant Level for Water Use Efficiency Estimates Based on Stomatal and Mesophyll Behaviour in Platycladus orientalis

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State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
2
Key Laboratory of State Forestry Administration on Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Academic Editor: Xuefa Wen
Water 2022, 14(2), 263; https://doi.org/10.3390/w14020263
Received: 10 November 2021 / Revised: 11 January 2022 / Accepted: 13 January 2022 / Published: 17 January 2022
Prediction of whole-plant short-term water use efficiency (WUEs,P) is essential to indicate plant performance and facilitate comparison across different temporal and spatial scales. In this study, an isotope model was scaled up from the leaf to the whole-plant level, in order to simulate the variation in WUEs,P in response to different CO2 concentrations (Ca; 400, 600, and 800 μmol·mol−1) and soil water content (SWC; 35–100% of field capacity). For WUEs,P modelling, leaf gas exchange information, plant respiration, and “unproductive” water loss were taken into account. Specifically, in shaping the expression of the WUEs,P, we emphasized the role of both stomatal (gsw) and mesophyll conductance (gm). Simulations were compared with the measured results to check the model’s applicability. The verification showed that estimates of gsw from the coupled photosynthesis (Pn,L)-gsw model accounting for the effect of soil water stress slightly outperformed the model neglecting the soil water status effect. The established coupled Pn,L-gm model also proved more effective in estimating gm than the previously proposed model. Introducing the two diffusion control functions into the whole-plant model, the developed model for WUEs,P effectively captured its response pattern to different Ca and SWC conditions. Overall, this study confirmed that the accurate estimation of WUEs,P requires an improved predictive accuracy of gsw and gm. These results have important implications for predicting how plants respond to climate change. View Full-Text
Keywords: mesophyll conductance; stomatal conductance; stable isotope; soil water stress; water use efficiency; whole-plant level mesophyll conductance; stomatal conductance; stable isotope; soil water stress; water use efficiency; whole-plant level
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MDPI and ACS Style

Zhang, Y.; Liu, B.; Jia, G.; Yu, X.; Zhang, X.; Yin, X.; Zhao, Y.; Wang, Z.; Cheng, C.; Wang, Y.; Xin, Y. Scaling Up from Leaf to Whole-Plant Level for Water Use Efficiency Estimates Based on Stomatal and Mesophyll Behaviour in Platycladus orientalis. Water 2022, 14, 263. https://doi.org/10.3390/w14020263

AMA Style

Zhang Y, Liu B, Jia G, Yu X, Zhang X, Yin X, Zhao Y, Wang Z, Cheng C, Wang Y, Xin Y. Scaling Up from Leaf to Whole-Plant Level for Water Use Efficiency Estimates Based on Stomatal and Mesophyll Behaviour in Platycladus orientalis. Water. 2022; 14(2):263. https://doi.org/10.3390/w14020263

Chicago/Turabian Style

Zhang, Yonge, Bing Liu, Guodong Jia, Xinxiao Yu, Xiaoming Zhang, Xiaolin Yin, Yang Zhao, Zhaoyan Wang, Chen Cheng, Yousheng Wang, and Yan Xin. 2022. "Scaling Up from Leaf to Whole-Plant Level for Water Use Efficiency Estimates Based on Stomatal and Mesophyll Behaviour in Platycladus orientalis" Water 14, no. 2: 263. https://doi.org/10.3390/w14020263

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