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| Towards a more flexible representation of water stress effects in the nonlinear Jarvis model |
| YU Lian-yu1, 2, CAI Huan-jie1, 2, ZHENG Zhen1, 2, LI Zhi-jun1, 2, WANG Jian1, 2 |
1 Key Laboratory of Agricultural Soil and Water Engineering in Arid Area, Ministry of Education/Northwest A&F University, Yangling 712100, P.R.China
2 Institute of Water Saving Agriculture in Arid Regions of China (IWSA), Northwest A&F University, Yangling 712100, P.R.China |
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Abstract To better interpret summer maize stomatal conductance (gs) variation under conditions of changing water status at different growth stages, three water stress indicators, soil water content (SWC), leaf-air temperature difference (?T) and leaf level water stress index (CWSIL) were employed in Jarvis model, which were JS, JT and JC models respectively. Measurements of gs were conducted in a summer maize field experiment during the year 2012–2013. In the insufficient irrigation experiment, three levels of irrigation amount were applied at four different growth stages of summer maize. We constructed three scenarios to evaluate the performance of the three water stress indicators for estimating maize gs in a modified Jarvis model. Results showed that JT and JC models had better simulation accuracy than the JS model, especially at the late growth stage (Scenario 1) or considering the plant recovery compensation effects (Scenario 2). Scenario 3 indicated that the more environmental factors were adopted, the better prediction performance would be for JS model. While for JT model, two environmental factors (photosynthesis active radiation (PAR), and vapor pressure deficit (VPD)) seemed good enough to obtain a reliable simulation. When there were insufficient environmental data, CWSIL would be the best option. This study can be useful to understand the response of plant stomatal to changing water conditions and will further facilitate the application of the Jarvis model in various environments.
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Received: 21 November 2015
Accepted:
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| Fund: This paper was supported by the Programme of Introducing Talents of Discipline to Universities, China (B12007), the National Natural Science Foundation of China (51179162) and the National Key Technoloies R&D Program of
China during the 12th Five-Years Plan period (2011BAD29B01). |
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Corresponding Authors:
CAI Huan-jie, Tel: +86-29-87082133, E-mail: caihj@nwsuaf.edu.cn
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| About author: YU Lian-yu, Mobile: +86-15129239647, E-mail: 710770061@nwsuaf.edu.cn |
Cite this article:
YU Lian-yu, CAI Huan-jie, ZHENG Zhen, LI Zhi-jun, WANG Jian.
2017.
Towards a more flexible representation of water stress effects in the nonlinear Jarvis model. Journal of Integrative Agriculture, 16(01): 210-220.
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