| 引用本文: | 李文玲,孙西欢,张建华,等.水氮耦合条件下温室番茄水氮生产函数研究[J].灌溉排水学报,0,():-. |
| liwenling,sunxihuan,zhangjianhua,et al.水氮耦合条件下温室番茄水氮生产函数研究[J].灌溉排水学报,0,():-. |
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| 摘要: |
| 【目的】为探究膜下滴灌水氮耦合对温室番茄产量的影响，寻求影响番茄产量的关键需水阶段，为番茄节水高效生产提供理论依据。【方法】设置四因素三水平水氮耦合正交试验，对温室水氮耦合下番茄的产量进行研究，建立番茄水氮生产函数的Jensen模型，并建立其水分敏感指数累积曲线，利用塑料大棚番茄水氮耦合产量结果对水氮生产模型进行验证。【结果】通过模型计算的番茄产量与实测产量的变化趋势一致，模型拟合残差平方和（SSE）为0.009 6，决定系数R2达到0.875，验证计算值和实测值之间的均方根误差、平均相对误差、平均绝对误差分别为2.98 t/hm2、2.53 %、2.39 t/hm2，得到各生育期水分敏感指数为“开花期（λ2=0.20）>苗期（λ1=0.096）>成熟期（λ3=0.059）”，通过水分敏感指数累积曲线计算得到的水分敏感指数与Jensen模型的水分敏感指数具有较好的拟合效果，各因素对番茄产量的显著性影响为“开花期灌水>苗期灌水>施氮量>成熟期灌水”，开花期灌水量对产量的影响达到显著水平（P<0.05）。T1处理产量达到72.92 t/hm2，是产量最高的处理。【结论】试验建立的水氮生产函数具有较高的模拟精度，可用于温室番茄膜下滴灌水氮耦合的产量模拟，水分敏感指数累积曲线对水分敏感指数的计算较为准确，可用于分敏感指数的预测。在整个生育阶段开花期的水分敏感指数最大。得到膜下滴灌水氮耦合番茄高产的理论最优方案为：苗期灌水量为0.75I、开花期灌水量为I、成熟期灌水量为I、施氮量为350 kg/hm2。 |
| 关键词: 水氮耦合；番茄；产量；水氮生产函数 |
| DOI： |
| 分类号:S275?????? |
| 基金项目:山西省重点研发计划重点项目(201703D211002)；国家重点研发计划项目(2017YFE0118100)；山西省自然基金项目(201701D221193)；有机旱作山西省重点实验室开放基金课题资助(201805D111015-1)；山西省高等学校科技创新项目(2019L0136); |
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| Study on Water and Nitrogen Production Function of Greenhouse Tomato in Water and Nitrogen Coupling |
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liwenling1, sunxihuan1, zhangjianhua2, majuanjuan1, guoxianghong1, leitao1, sunruifeng1, songtao2
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1.College of Water Resources Science and Engineering, Taiyuan University of Technology;2.Shenzhen Institute of Hong Kong Baptist University
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| Abstract: |
| 【Objective】In order to explore the effect of water-nitrogen coupling under mulch drip irrigation on the yield of greenhouse tomato, and to find the key stage of water demand affecting the yield of tomato, so as to provide theoretical basis for water-saving and efficient production of tomato.【Methods】Four factors and three levels of water nitrogen coupling orthogonal test were set up to study the tomato yield under the coupling of water and nitrogen in greenhouse, Jensen model of tomato water nitrogen production function was established, and its water sensitive index accumulation curve was established, and the water nitrogen coupling yield of Tomato in plastic greenhouse was used to verify the water nitrogen production model.【Results】The trend of tomato yield calculated by the model is consistent with the measured yield. The square sum of model fitting residuals (SSE) is 0.009 6, and the determination coefficient R2 is 0.875. It is verified that the root mean square error, average relative error and average absolute error between the calculated value and the measured value are 2.98 t/hm2, 2.53 % and 2.39 t/hm2, respectively. The water sensitive index of each growth stage is "flowering stage (λ2=0.20)>seedling stage (λ1=0.096)>mature stage (λ3=0.059)". The water sensitive index calculated by the cumulative curve of water sensitive index has a good fitting effect with the water sensitive index of Jensen model. The significant effect of each factor on tomato yield is "irrigation at flowering stage>irrigation at seedling stage>nitrogen application>irrigation at maturity stage", and the effect of irrigation at flowering stage on yield reaches significant level (P<0.05). The yield of T1 treatment was 72.92 t/hm2, which was the highest.【Conclusion】The water and nitrogen production function established in the experiment has high simulation accuracy, and can be used in the yield simulation of greenhouse tomato film drip irrigation and nitrogen coupling. The cumulative curve of water sensitive index is more accurate for the calculation of water sensitive index, which can be used for the prediction of sub sensitive index. The water sensitive index of flowering stage was the highest. The theoretical optimal scheme for high yield of tomato was 0.75I in seedling stage, I in flowering stage, I in mature stage and 350 kg/hm2 in nitrogen application. |
| Key words: Water nitrogen coupling; tomato; yield; water and nitrogen production function |
