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| DOI：10.13522/j.cnki.ggps.20180492 |
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| Growth Kinetic Mechanism and Simulation of Tibetan Hulless Barley under Different Water and Fertilizer Condition |
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LI Yuqing, MENG Qiang, ZHANG Cun, ZHANG Wenxian, ZHOU Zuhao
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1. Water Conservancy Project and Civil Engineering College Tibet Agriculture and Animal Husbandry College, 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】The objective of this paper is to present a model to simulate the growth of highland barley under water and nitrogen stresses.【Method】Field experiments were conducted in 2016—2017 at Nyingchi in Tibetan Plateau; during the experiment, we measured the growth of the highland barley under different combinations of soil water and nitrogen stresses; their interactive effect on the growth was analyzed using the variance analysis method. A dynamic model, including four variables, was developed to simulate the crop growth and its associated dry-matter accumulation. The data in 2016 and 2017 were used to calibrate and validate the model, respectively.【Result】The physiological development of the highland barley was affected by a multitude of factors. The accumulating rate of the dry matter in the crop increased nonlinearly with soil water and nitrogen, and the impact of each factor can be represented by a partial correlation coefficient. The mean Nash-Sutcliffe coefficient between the simulated and the measured dry matter was 0.872, and there was no systematic deviation between the simulated and measured dry matter at significant level of 5%. 【Conclusion】The simulated and observed dry matters were consistent. The physiological nature of the model means that it can accurately describe the growth of the highland barley in Tibetan Plateau. |
| Key words: highland barley; Tibet plateau; multi-factor interaction; model; water content; nitrogen; soil |
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