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氣象因子對負(fù)水頭供液下番茄日耗液量的敏感性分析
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北京市自然科學(xué)基金項(xiàng)目(6142008)


Sensibility Analysis of Meteorological Factors on Daily Consumption of Nutrient Solution for Tomato Using Negative Pressure
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    摘要:

    以番茄為試驗(yàn)材料,測定其在溫室內(nèi)基質(zhì)栽培負(fù)水頭供液條件下的日耗液量、空氣相對濕度、氣溫和太陽輻射強(qiáng)度等氣象因子數(shù)據(jù),采用通徑分析方法,建立多元回歸模型,計(jì)算各氣象因子對番茄日耗液量的直接通徑系數(shù)、間接通徑系數(shù)、決定系數(shù)和對回歸方程估測可靠程度R2的總貢獻(xiàn)值。結(jié)果表明:作物系數(shù)和日平均太陽輻射強(qiáng)度的直接通徑系數(shù)達(dá)到極顯著水平(P<0.01),2個(gè)因子的決定系數(shù)和對R2總貢獻(xiàn)值最大,是影響番茄日耗液量的重要因子;氣象因子減少對番茄日耗液量影響的通徑分析發(fā)現(xiàn),敏感性最強(qiáng)的氣象因子是日平均太陽輻射強(qiáng)度,其次分別是作物系數(shù)和日最高太陽輻射強(qiáng)度。

    Abstract:

    Negative pressure irrigation technique, which is one of the new irrigation technology for saving water, was applied to substrate culture in greenhouse. There were fewer researches on the relationship between the daily consumption of tomato and meteorological factors added to the leaching link in substrate culture. The daily consumption of plant was affected by the interaction with meteorological factors and by the sensitivity of the meteorological factors. It was beneficial to develop the system of supplying nutrient solution and the management methods with substrate culture using negative pressure in greenhouse based on mastering above relationships. Tomato was used as a material with substrate culture testing for the condition of negative pressure to supply nutrient solution. The daily consumption of nutrient solution and meteorological factors, e.g., air relative humidity, air temperature and solar radiation intensity, were measured. Based on these factors, a multivariate regression model was established and the direct path coefficient, indirect path coefficient, determination coefficient and total contributions for estimating the reliability degree of the regression model were calculated by path analysis method. The results showed that the direct path coefficients of crop coefficient and daily average solar radiation intensity reached a very significant level (P<0.01). The determination coefficient of these two factors and the contributions to R2 among the factors were the maximum, thus the two factors were the important meteorological factors on daily consumption of nutrient solution for tomato.From the effect of meteorological factors reduction on daily consumption value by path analysis, it was indicated that the daily average solar radiation intensity was the strongest sensitive factors, followed by the crop coefficient and daily maximum solar radiation intensity.

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張芳,張建豐,薛緒掌,王利春,陳曉麗,李友麗.氣象因子對負(fù)水頭供液下番茄日耗液量的敏感性分析[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2017,48(8):229-238. ZHANG Fang, ZHANG Jianfeng, XUE Xuzhang, WANG Lichun, CHEN Xiaoli, LI Youli. Sensibility Analysis of Meteorological Factors on Daily Consumption of Nutrient Solution for Tomato Using Negative Pressure[J]. Transactions of the Chinese Society for Agricultural Machinery,2017,48(8):229-238.

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  • 收稿日期:2016-12-10
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  • 在線發(fā)布日期: 2017-08-10
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