| Cite this article: | 许浒,蒋尚明,袁宏伟,等.受旱试验与相对生长率相结合的小麦旱灾系统敏感性识别与评估[J].灌溉排水学报,0,():-. |
| XU Hu,JIANG Shang-ming,YUAN Hong-wei,et al.受旱试验与相对生长率相结合的小麦旱灾系统敏感性识别与评估[J].灌溉排水学报,0,():-. |
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| Identification and Evaluation of Wheat Drought System Sensitivity based on Drought Experiment and Relative Growth Rate |
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XU Hu1, JIANG Shang-ming1, YUAN Hong-wei1, LIU Jia1, JIN Ju-liang2
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1.Key Laboratory of Water Conservancy and Water Resources of Anhui Province,Water Resources Research Institute of Anhui Province and Huaihe River Commission,Ministry of Water Resources;2.School of Civil Engineering,Hefei University of Technology
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| Abstract: |
| 【Background】 Drought system sensitivity is the basic component of drought system vulnerability, it shows the loss sensitivity of crops in different growth periods and different drought stress intensities. And also it is the key link of the transition from drought risk to drought loss.【Objective】 In order to effectively reveal the drought-causing mechanism of different growth processes of wheat that the risk of drought-causing factors converted from the vulnerability of the hazard-bearing body to the drought loss.【Method】To carry out special trials of drought stress in different growth stages of wheat. Based on the change of the total dry matter accumulation during the single growth period due to drought stress, and to construct the sensitivity function of wheat drought system by relative growth rate method. Based on this, quantitative identification and evaluation of wheat drought system sensitivity were carried out. 【Result】The results indicate that wheat tillering stage under drought stress will be a relatively large relative growth rate of the reduction. But with the increase of drought stress, the inhibition of wheat growth and dry matter accumulation was not obvious. Drought stress during this growth period will stimulate the adaptive ability of wheat, to promote the vertical growth of root system. And it is beneficial to the later growth and development. Therefore, insufficient water supply control can be implemented at tillering stage of wheat. Mild drought stress at jointing and booting stage has little effect on growth and development of wheat, but the system sensitivity of wheat was the highest under severe drought stress. 【Conclusion】The relative growth rate of total dry matter accumulation of wheat decreased to a certain extent under drought stress at tillering stage. But with the increase of drought stress, the inhibitory effect on wheat dry matter accumulation is not enhanced. Therefore, irrigation with insufficient water supply can be carried out at the tillering stage of wheat. Mild drought stress at the jointing and booting stage of wheat has little effect on wheat growth, but the system is most sensitive under severe drought stress. Therefore, the soil moisture content at jointing and booting stage should be higher than 55% of the field water holding capacity. The system sensitivity of wheat heading and flowering stage and filling stage are relatively high, and mild drought stress will have a greater impact on wheat growth. Therefore, the soil moisture content should be higher than 75% of field water holding capacity at heading and flowering stage and grain filling stage. |
| Key words: wheat; drought system sensitivity; drought stress; relative growth rate; sensitivity function |
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