狼毒种子不同密度对6种草地植物种子发芽及幼苗生长的化感影响

Allelopathic effects of Stellera chamaejasme seeds with different densities on germination and seedling growth of six grassland plants

为了探究狼毒种子对6种草地植物针茅(Stipa copillata)、羊草(Aneurolepidium chinense)、披碱草(Elymus dahuricus)、扁穗冰草(Agropyron cristatum),独行菜(lepidium apetalum)、碱地风毛菊(Saussurea runcinata)种子发芽和幼苗生长的影响,采用培养皿滤纸法分别将不同密度的狼毒种子(0、5、10、20、40粒/皿)和6种草地植物种子(10粒/皿)一起培养,并测定了相关指标。结果表明:随着狼毒种子密度增大,受试种子发芽率,发芽势,发芽指数先增大后减小,且为促进作用,在狼毒种子密度为10粒/皿时促进作用最大,促进作用由大至小依次为披碱草,羊草,扁穗冰草,针茅,碱地风毛菊,独行菜。除碱地风毛菊根长在狼毒种子密度为10粒/皿时存在微弱的抑制作用之外,其他受试植物根长苗长存在不同程度的促进作用。

The effects of Stellera chamaejasme seeds on germination of 6 plants seeds(Stipa copillata,Aneurolepidium chinense,Elymus dahuricus,Agropyron cristatum,lepidium apetalum,Saussurea runcinata,Stellera chamaejasme) were studied with filter paper culture method.The seed densities of Stellera chamaejasme were 0,5,10,20,40 grains/dish and seed density of 6 grassland plants was 10 grains/dish.The results showed that,the germination rate,germination potential and germination index of the tested seeds increased and then decreased along with the increasing of seed density of Stellera chamaejasme.When the seed density of Stellera chamaejasme was 10 grains/dish,the promoting effect reached the maximum.The order of effect of Stellera chamaejasme on 6 plants was Elymus dahuricus,Aneurolepidium chinense,Agropyron cristatum,Stipa copillata,Saussurea runcinata and Lepidium apetalum.The root length of Saussurea runcinata was slightly inhibited when the seed density of Stellera chamaejasme was 10 grains/dish,and for the rest 5 tested plants,it was promoted at different degrees.