| 贺鹏,王鹏新,解毅,张树誉,刘峻明.基于动态模拟的冬小麦水分胁迫敏感性研究[J].干旱地区农业研究,2016,34(1):213~219 |
| 基于动态模拟的冬小麦水分胁迫敏感性研究 |
| Analysis on the sensitivity to water stress of winter wheat based on a dynamicsimulation model |
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| DOI：10.7606/j.issn.1000-7601.2016.01.33 |
| 中文关键词: 冬小麦 CERES-Wheat模型 水分胁迫 敏感系数 |
| 英文关键词:winter wheat CERES-Wheat model water stress sensitivity coefficient |
| 基金项目:国家自然科学基金项目（41371390）;国家科技支撑计划项目（2012BAD20B0103） |
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| 中文摘要: |
| 以关中平原为研究区域，在对农业技术转移决策支持系统(DSSAT)中的CERES-Wheat模型进行标定基础上，模拟冬小麦整个生育期以日为步长的实际蒸散量和潜在蒸散量，采用Jensen模型研究冬小麦不同生育时期对水分胁迫的敏感性。结果表明，无论旱作样点还是灌溉样点，冬小麦在同一生育时期对水分胁迫的敏感性相同，且拔节期的敏感性最强，抽穗～灌浆期次之，返青期和乳熟期依次递减。灌溉样点在拔节期和抽穗～灌浆期的水分胁迫敏感系数分别为0.589与0.342，对水分胁迫的敏感性相差较大，而旱作样点在两生育时期的水分胁迫敏感系数分别为0.405与0.383，对水分胁迫的敏感性相差较小，由于灌溉样点在拔节期发生水分胁迫现象可以通过及时灌溉以缓解缺水情况，因而会减弱其后抽穗～灌浆期的水分胁迫敏感性。根据水分胁迫敏感性，对不同生育时期缺水采取不同措施，较好地实现抗旱防旱资源的合理利用。 |
| 英文摘要: |
| Using the calibrated CERES-Wheat model under the DSSAT shell, daily actual evapotranspiration and potential evapotranspiration during the growth stages of winter wheat were simulated in the Guangzhong plain of Shaanxi Province, China. Sensitivity coefficients of water stress of winter wheat at different growth stages were calculated by the Jensen model. The results indicated that the sensitivity coefficients of water stress on winter wheat were the same at the same growth stage in both irrigated and rainfed areas. The sensitivity coefficients of winter wheat were the largest at the jointing stage, and were gradually decreased at the heading-filling stage, turning green stage and dough stage. The sensitivity coefficients at the jointing stage and heading-filling stage were 0.589 and 0.342 in the irrigated areas, respectively, indicating that the water stress at these two stages had different impacts on wheat yield. Nevertheless, those were 0.405 and 0.383 in the rainfed areas, suggesting that the water stress at these two stages had similar impacts on wheat yield. Because the irrigated areas were often irrigated at the jointing stage in order to relieve the lack of water, the sensitivity of water stress on winter wheat was weakened, and the difference in the sensitivity coefficients of winter wheat between the jointing stage and the heading-filling stage was small. Based on the sensitivity coefficients of water stress, specific measurements should be taken on winter wheat according to the water-deficit conditions at each growth stage to ensure rational use of drought-related resources. |
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