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材料和方法 用贮藏1年后的花旗松花粉继续测定的方法得到试验数据(Copes 1985)。本试验采用方法同1985年报道的方法一样,进行同样的花粉采集、贮藏和授粉处理,记录了
MATERIALS AND METHODS Test data were obtained by continued measurement of Douglas fir pollen stored one year later (Copes 1985). This test uses the same method as reported in 1985 for the same pollen collection, storage and pollination treatments