| 引用本文: | 徐烈辉,牟汉书,王景才,等.基于冠气温差的淮北地区水稻日需水量估算模型研究[J].灌溉排水学报,2020,39(3):119-125. |
| ,et al.基于冠气温差的淮北地区水稻日需水量估算模型研究[J].灌溉排水学报,2020,39(3):119-125. |
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| 摘要: |
| 【目的】构建水稻日需水量估算模型，为灌区动态用水管理提供科学指导。【方法】以淮北淮涟灌区水稻为研究对象，通过称质量法获取水稻日需水量，同步采集水稻冠层温度和相关气象要素，分析各要素与实测水稻日需水量关系，构建了以太阳净辐射和冠气温差为参数的水稻日需水量估算模型，并利用叶面积指数对其进行修正。【结果】太阳净辐射量和冠气温差是反映水稻日需水量的关键因子，水稻日需水量与太阳净辐射呈正线性相关，与冠气温差呈负线性相关，冠气温差随着生育期延续有增大的趋势。通过叶面积指数修正的模型相对误差为5.07%，均方根误差为0.183 mm/d。【结论】利用冠气温差估算水稻日需水量，方法较为简单，精度满足灌溉管理要求。 |
| 关键词: 冠气温差；水稻日需水量；估算模型；叶面积指数；模型修正 |
| DOI：10.13522/j.cnki.ggps.20190195 |
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| Estimating Daily Water Requirement of Rice in Huaibei Region Using Temperature Difference between Canopy and Ambient Air |
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XU Liehui, MOU Hanshu, WANG Jingcai, ZHOU Mingyao
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1.College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225009, China；2. Huai’an Water Conservancy Bureau, Huai’an 223005, China
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| Abstract: |
| 【Objective】Understanding the change in demand of crop for water is essential to improving irrigation management, and the purpose of this paper is to verify the feasibility of using temperature difference between rice canopy and its ambient air to estimate its water requirement.【Method】The experiment was conducted in lysimeters at the Huailian Irrigation Districts in Huaibei Region, and the daily water requirement of the rice was obtained by weighing the lysimeters. We also measured the temperature in the rice canopy and its ambient air concurrently. A model using solar net radiation and canopy-air temperature difference to estimate the daily rice water requirement was presented, with its results further modified by the leaf area index.【Result】The solar net radiation and the canopy-air temperature difference were two key factors affecting water requirement of the rice, with the former impacting on the water requirement negatively and the latter positively; the canopy-air temperature difference appeared to increase as the crop grew. The relative error of the model after modification by the leaf area index was 5.07%, and its associated root mean square error was 0.183 mm/d.【Conclusion】Estimating daily water requirement of rice using canopy-air temperature difference is simple and the results could meet the requirement of irrigation management. |
| Key words: canopy-air temperature difference; daily water requirement of rice; leaf area index; modification by leaf area index. |
