腐解3个月后杉木枯枝落叶及腐殖土中的化感成分对杉木种子的化感效应

对腐解3个月后杉木〔Cunninghamia lanceolata(Lamb.) Hook.〕枯枝落叶及腐殖土中的化感成分进行了提取分离,并用杉木种子进行了生物检测。结果表明,与对照相比,杉木枯枝落叶中的极性和弱极性化感成分以及腐殖土中的弱极性化感成分对杉木种子的绝对发芽率、绝对发芽势、胚根长和胚轴长均有一定的抑制作用,但对幼苗干质量的抑制作用不明显。随浓度的提高,杉木枯枝落叶中的弱极性化感成分对杉木种子的绝对发芽势和胚轴长的抑制作用明显提高,极性化感成分对胚根长的抑制作用不断减小。随腐殖土中弱极性化感成分浓度的提高,对杉木种子绝对发芽率的抑制作用增加;腐殖土中的极性化感成分对杉木种子的绝对发芽率、绝对发芽势及胚轴长的抑制作用均随着浓度的升高而逐渐增强。

Allelopathic effects of allelochemicals in Cunninghamia lanceolata litter and humus soil on its seed germination after decomposing for three months

Allelochemicals in Cunninghamia lanceolata (Lamb.) Hook. litter and humus soil were extracted after decomposing for three months and C. lanceolata seed germination bioassay was conducted. The results showed that compared to control, polar and little-polar allelochemicals in litter and little-polar allelochemicals in humus soil had significant inhibition to absolute germination rate, absolute germination potential, radical length and plumular axis length of seeds, but their inhibitions to dry weight of seedling were not obvious. The inhibition of little-polar allelochemicals in litter to absolute germination potential and plumular axis length obviously increased and that of polar allelochemicals in litter to radical length constantly decreased with concentration rising. The inhibition of little-polar allelochemicals in humus soil to absolute germination rate and that of polar allelochemicals in humus soil to absolute germination rate, absolute germination potential and plumular axis length of seeds gradually enhanced with concentration rising.