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将美国黄松(Pinus ponderosa)的同类种子分三种处理:(a)暴露在24小时光照下;(b)暴露在红光和红外光下;(c)暴露在交替的红光和红外光下,观察其发芽速度和发芽率。用24小时光照处理的种子比保持在暗处的发芽率高。对层积0～7天的种子用红光照射能提高发芽率,而用红外光照射则有抑制作用。层积21天的种子比层积期较短的发芽率高,且对不同红光和红外光处理无反应。用2段红光中间加一段红外光处理的种
The same species of Pinus ponderosa is treated in three different ways: (a) exposed to 24 hours of light; (b) exposed to red and infrared light; (c) exposed to alternating red and infrared light Under, observe the germination rate and germination rate. The seeds treated with light for 24 hours had a higher rate of germination than those kept in the dark. The seed of 0 ~ 7 days of stratification can increase the germination rate with red light, while it can inhibit with infrared light. The 21-day-old seeds had a higher rate of germination than the shorter period of stratification and did not respond to different red and infrared light treatments. With 2 paragraphs in the middle of a red light infrared species