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潜在花粉源强是玉米花粉扩散模型的重要参数。为了确定玉米潜在花粉源强,本研究测定了逐日散粉量和逐时开花率,以此来确定逐时散粉量,作为模型中潜在花粉源强的输入值。以2009年溧水试验资料为基础,应用正态分布函数模拟逐时散粉量的日变化,通过气温和相对湿度参数订正逐时散粉量;利用2010年公主岭和溧水试验资料对玉米潜在花粉源强的正态分布模型进行检验。结果表明:公主岭试验中的“紫糯18”、“吉单35”和溧水试验中的“紫糯18”、“苏608”的逐时散粉量的模拟值与实测值之间的均方根误差分别为2.24×105、1.52×105、1.24×105和8.92×104粒·株-1,决定系数分别为0.330、0.545、0.365和0.606。利用相同的数据检验气温和相对湿度订正后的模型,各品种逐时散粉量的模拟值与实测值之间的均方根误差分别减少至1.25×105、9.03×104、5.14×104和4.22×104粒·株-1,决定系数则分别提高至0.656、0.718、0.779和0.843;模型效果明显改善,从而为进一步精确模拟玉米花粉扩散奠定基础。
Potential source of pollen is an important parameter of corn pollen dispersal model. In order to determine the potential sources of potential pollen in maize, we determined the daily amount of scattered powder and the hourly rate of flowering to determine the amount of intermittent loose powder as an input to potential pollen sources in the model. Based on the data of Lishui in 2009, the normal distribution function was used to simulate the diurnal variation of the amount of time-laden bulk powder, and the amount of lamellar powder was revised by the temperature and relative humidity parameters. Using the data from Gongzhuling and Lishui in 2010, the potential pollen sources of maize Normal distribution model for testing. The results showed that the simulated value of the amount of pulsating powder on the “Purple Glutinous Rice 18”, the “Guidan 35” and the “Purple Glutinous Rice 18” and “Su 608” The root mean square error between the measured values was 2.24 × 105, 1.52 × 105, 1.24 × 105 and 8.92 × 104 particles · plant -1, respectively. The determination coefficients were 0.330, 0.545, 0.355 and 0.606, respectively. Using the same data to test the revised model of air temperature and relative humidity, the root mean square error between simulation value and measured value of the amount of powder on a hourly basis was reduced to 1.25 × 105, 9.03 × 104, 5.14 × 104 and 4.22 × 104 grains · plant -1 and the coefficient of determination increased to 0.656, 0.718, 0.779 and 0.843 respectively. The model effect was obviously improved, which laid the foundation for further accurately simulating the pollen dispersal in maize.