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一 引言 杉木的种子中,癟粒占很大比例;根据生产和研究上许多材料证明:癟粒的比例,一般都在30—40％以上。最高的65—70％。因此杉木种子的发芽率很低,据1956—1957年福建、江西、四川等省种子检验站的材料,杉木种子实验室发芽率平均只有35—40％。最低的15％,最高的68％。这种情况给生产上带来很大的不便和损失,因此研究如何提高杉木种子质量问题,在林业生产上具有重要意义。 杉木种子的癟粒,从外表形态上看,不易与好的种粒区别,在处理和清选种子时也难加以清除,近年来,生产上采用不同的比重液(先用7％,后用25％)来清选种子,去掉癟粒,收到一些效果,但是对于癟粒形成的原因和解释,却一直没有解决,更谈不上什么防治措施了。有些学者认为癟粒可能是由于种子在成熟时,气候过于阴湿所引起,但这种说法没有得到证
I. INTRODUCTION Fir seeds account for a large proportion of the seeds; according to many materials on production and research, the proportion of shrunken grains is generally above 30-40%. The highest 65-70%. Therefore, the germination rate of Chinese fir seeds is very low. According to the materials of the seed check stations of Fujian, Jiangxi and Sichuan from 1956 to 1957, the average germination rate of Chinese fir seed labs is only 35-40%. The lowest 15%, the highest 68%. This situation has brought great inconvenience and loss to the production, so how to improve the seed quality of Chinese fir is of great significance in the forestry production. Fir grains of Chinese fir seeds, from the appearance point of view, is not easy to distinguish with good seeds, it is hard to remove when dealing with and clearing seeds. In recent years, the production of different proportion of liquid (first with 7%, after use 25%) to clear the seeds, get rid of shrapnel, received some results, but for the formation of shrapnel reason and explanation, has not been solved, let alone what control measures. Some scholars believe that the shrunken grain may be due to the seed at maturity, the climate is too damp caused, but this argument has not been certified