气象因子对负水头供液下番茄日耗液量的敏感性分析

以番茄为试验材料,测定其在温室内基质栽培负水头供液条件下的日耗液量、空气相对湿度、气温和太阳辐射强度等气象因子数据,采用通径分析方法,建立多元回归模型,计算各气象因子对番茄日耗液量的直接通径系数、间接通径系数、决定系数和对回归方程估测可靠程度R~2的总贡献值。结果表明:作物系数和日平均太阳辐射强度的直接通径系数达到极显著水平(P0.01),2个因子的决定系数和对R~2总贡献值最大,是影响番茄日耗液量的重要因子;气象因子减少对番茄日耗液量影响的通径分析发现,敏感性最强的气象因子是日平均太阳辐射强度,其次分别是作物系数和日最高太阳辐射强度。

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

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.