腐解6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6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及生物检测。结果表明，枯枝落叶及腐殖土中的极性和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。随浓度的提高，枯枝落叶中的弱极性化感成分对绝对发芽率、胚轴长及幼苗干质量的抑制作用及极性化感成分对绝对发芽势、胚轴长的抑制作用均逐渐增强；腐殖土中的弱极性化感成分对绝对发芽率、绝对发芽势、胚根长及胚轴长的抑制作用及极性化感成分对胚轴长的抑制作用也逐渐增强。枯枝落叶中的化感成分对绝对发芽率、绝对发芽势及幼苗干质量的抑制效应高于腐殖土中的化感成分。

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

Allelochemicals in Cunninghamia lanceolata （Lamb.） Hook. litter and humus soil were extracted and bioassayed after decomposing for six months. The bioassay results showed that the polar and little-polar allelochemicals in litter and humus soil had the inhibition to absolute germination rate, absolute germination potential, radical length and plumular axis length of C. lanceolata seed. The inhibition of little-polar allelochemicals in litter to absolute germination rate, plumular axis length and dry weight of seedling increased gradually and that of polar allelochemicals in litter to absolute germination potential and plumular axis length also increased with the concentration rising. The inhibition of little- polar allelochemicals in humus soil to absolute germination rate, absolute germination potential, radical length and plumular axis length increased constantly and that of polar allelochemicals in humus soil to plumular axis length also increased with the concentration rising. The allelochemicals in litter of C. lanceolata had a stronger inhibitory effect on absolute germination rate, absolute germination potential and dry weight of seedlings of C. lanceolata than that in humus soil.