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为了解杉木连栽土壤中有毒化感物质对杉木幼苗毒害作用 ,采用水培杉木幼苗方法 ,通过投加不同浓度香草醛 ,发现 1mg·kg- 1 香草醛显著抑制杉木种子胚根的伸长 (P<0 .0 5) ,只为对照的 70 % ;香草醛浓度达 1 0mg·kg- 1 时 ,叶绿素总量明显下降到对照的80 % ;超过 2 0mg·kg- 1 对杉木幼苗地径与高度生长产生明显抑制作用 ;50mg·kg- 1 以上将明显影响地上部分枝叶的正常生长发育 ,及至植株冠层的生长 ;超过 1 0 0mg·kg- 1 ,整个植株的生长受到显著抑制 .香草醛是连栽土壤中毒性较大的一种有毒化感物质 ,是杉木存活率低的重要原因之一 .
In order to understand the toxic effects of toxic and allelochemicals in Cunninghamia lanceolata plantations on Chinese fir seedlings, 1 mg · kg-1 vanillin significantly inhibited the elongation of the roots of Cunninghamia lanceolata seedlings by applying the seedlings of Hydroponics Chinese fir seedlings with different concentrations of vanillin P <0.05), only 70% of the control; the total chlorophyll of the vanillin concentration of 10 mg · kg-1 significantly decreased to 80% of the control; when the concentration of 20 mg · kg- And significantly inhibited the growth of the plant; 50mg · kg-1 above will significantly affect the aboveground branches and leaves of normal growth and development, and to the canopy growth; more than 100mg · kg-1, the growth of the entire plant was significantly inhibited. Aldehyde is a kind of poisonous and allergenic substance that is poisoned by continuous planting soil and is one of the important reasons for the low survival rate of Chinese fir.