多菌灵处理对克隆植物大米草(Spartina anglica)表型可塑性的影响

对外来植物大米草(Spartina anglica)衰退种群进行高、中、低3个浓度(即50%多菌灵可湿性粉剂的300倍、600倍和1200倍稀释液)多菌灵灌根处理,测定大米草在杀菌剂处理条件下的形态可塑性、克隆生长特性及生物量积累与分配格局.结果表明:与对照相比,各浓度多菌灵处理对大米草的株高、叶数、叶片厚度、叶片面积和根长均没有显著影响(P〉0.05);中浓度处理后,大米草种群的根状茎节数和分枝强度均显著高于对照和其它处理,而根状茎总长和间隔子长度均显著高于对照和低浓度处理(p<0.05),与高浓度处理差异不显著;高浓度处理的大米草地下生物量和根生物量分配显著高于对照和其它处理,而地上生物量分配却显著低于对照和其它处理(P

Effect of carbendazim treatments on morphological plasticity of clonal plant Spartina anglica

The different carbendazim concentration treatments including 300(high),600(medium) and 1 200(low) diluent of 50% wet carbendazim powder were applied on the soil where Spartina anglica grew in the field experimental plots.The morphological plasticity,clonal characteristics and biomass allocation patterns of S.anglica under the treatments were examined.There was no significant effect on culm height,number of leaves,leaf thickness, leaf area and root length(p>0.05) with 3 carbendazim treatments.Meanwhile,the node number of rhizomes and branching intensity of the species under medium concentration treatment were significantly higher than those of CK and the other treatments(p<0.05).However,total rhizome length and spacer length were significantly higher than those of CK and low concentration treatment and are not significantly different from those of high concentration treatment.More biomass was allocated to under-ground organs and less biomass to above ground parts with high concentration treatment(p<0.05).Consequently,the results implied that medium concentration of carbendazim treatment enhanced the clonal growth and the population sustaining and regenerating ability of S.anglica.We might draw the conclusion that the decline of S.anglica in coastal China resulted from infection of some fungus in the natural sediment.