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以不同品种番茄为试材,采用二次饱和-D最优设计,研究了UV-B辐射对番茄幼苗生长的影响,建立了生长量及壮苗指数与UV-B辐射强度和时间之间的数学模型,探讨了UV-B的生物学效应。结果表明:UV-B辐射显著改变了番茄幼苗的生长特性,且不同品种对UV-B辐射的响应较为一致;经模型解析表明,随UV-B辐射强度或时间的增加,番茄幼苗株高降低,而茎粗、根茎叶干物质量及壮苗指数则先升高后降低;辐射强度与时间存在显著的互作效应,UV-B辐射强度对株高的影响大于辐射时间,而对茎粗及壮苗指数的效应则相反;经模拟运算,培育壮苗的适宜UV-B辐射强度为14.5~25.6μW·cm-2,辐射时间为4.1~5.8 h·d-1。
The effect of UV-B radiation on the growth of tomato seedlings was studied by using the second-order saturation-D optimum design. The effects of UV-B radiation on the growth of tomato seedlings were studied. The relationship between growth and seedling index and UV-B radiation intensity and time Mathematical model to explore the biological effects of UV-B. The results showed that UV-B radiation significantly changed the growth characteristics of tomato seedlings, and the response of different varieties to UV-B radiation was consistent. The model analysis showed that with the increase of UV-B radiation intensity or time, the plant height of tomato seedlings decreased , While the stem diameter, dry matter weight and seedling index of rhizomes and leaves first increased and then decreased. There was a significant interaction between radiation intensity and time. The effect of UV-B radiation intensity on plant height was greater than that of irradiation time. The effect of strong seedling index was opposite. The simulated UV-B radiation intensity of strong seedling was 14.5-25.6μW · cm-2 and the irradiation time was 4.1-5.8 h · d-1.