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| DOI：10.13522/j.cnki.ggps.20180275 |
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| Modelling Hulless Barley Growth in Tibet Plateau Under Multiple Abiotic Stresses |
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LI Yuqing, MENG Qiang, LIU Jingxia, ZHANG Wenxian, LUO Hongying, ZHOU Zuhao
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1. School of Hydraulicand Civil Engineering, Tibet Agricultural and Animal University, Nyingchi 860000, China;2. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin，China Institute of Water Resources and Hydropower Research, Beijing 100038, China
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| Abstract: |
| 【Objective】 Hulless barley is a stable crop in Tibet plateau and this paper presents a model to simulate its growth under multiple abiotic stresses. 【Method】 Field and lab experiments were conducted at Moda Irrigation District in Lhasa and the Irrigation and Drainage lab at Nyingchi during the 2016—2017 growth season respectively. During the experiment, meteorological data, soil water content and soil nitrogen were measured. Daily dry matters were simulated based on photosynthesis and respiration of the crop, in which a switch factor was used to determine the time at which the crop changed from developmental stage to reproduction stage. The daily increased dry matter were partitioned into root, stem, leaf and ear using the mass balance between leaf development and crop growth. The dry matters in the root, stem and leaf were allowed be transformed to the ears in the reproduction stage. The combined stress of water and nitrogen were described using calibrated functions, and the values of the model parameters were obtained by fitting the measured data in Moda Irrigation District in 2016, and they were then used to model the crop growth in 2017. 【Result】The Nash-Sutcliffe coefficient and the relative root mean square error between the measured and simulated hulless barley dry matters were 0.84 and 0.05 respectively using the parameters estimated locally, and were 0.67 and 0.11 respectively using the parameters under changing condition. 【Conclusion】The proposed model is able to describe growth of the hulless barley under the combined water and nitrogen stresses. |
| Key words: hulless barley; model; nitrogen; farmland weather conditions; growth kinetics; Tibet plateau |
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