不同氮处理杉木桩腐解6个月后化感物质对杉木种子的化感效应

把在不同水平NH4Cl、NaNO3处理下分解6个月后的杉木桩化感物质应用于杉木种子发芽试验，并进行生物检测，结果表明：杉木桩弱极性化感物质对杉木种子胚根长产生促进作用，对绝对发芽率、绝对发芽势、胚轴长、鲜物质量和干物质量则表现出抑制作用；而杉木桩极性化感物质对杉木种子绝对发芽率、胚根长和干物质量表现出促进作用，对绝对发芽势、胚轴长和鲜物质量表现出抑制作用。5个处理相比，加NH4Cl分解的杉木桩化感物质对杉木种子的化感促进效应大于加NaNO3分解的，其中加100gNH4Cl处理对杉木种子发芽的化感促进效应最大。

Allelopathic Effect of Substances Decomposed from Cunninghamia lanceolata Stump Treated with Different N Levels on Its Own Seed Germination

Allelochemicals extracted from the Cunninghamia lanceolata stump after having been decomposed for six months in solutions with different concentrations of NH4Cl and NaNO3 , and bioassary of C. lanceolata seed germination test was conducted. The results showed that the weak-polar allelochemicals extracted from the decomposed C. lanceolata stump had positive effects on the embryo root lengthening, whereas they had inhibiting effects on the absolute germination rate, absolute germination power, embryo axis lengthening, fresh weight and dry weight increment. The polar allelochemicals extracted from the decomposed C. lanceolata stump had positive effects on the absolute germination rate, average embryo root lengthening and dry weight increment, whereas they had inhibiting effects on absolute germination power, embryo axis lengthening and fresh weight increment. Among the five treat- ments, allelochemicals extracted from the decomposed C. lanceolata stump with NH4Cl added had stronger positive effects on germination of C. lanceolata seeds than that of by adding NaNO3, and the allelochemicals extracted from the decomposed C. lanceolata stump with adding 100 g NH4Cl had the most strong positive effects.