不同浸泡处理对破除那曲不同退化草甸草地土壤种子库种子休眠的影响研究(摘要)(英文)

[目的]研究不同浸泡处理对破除那曲不同退化草甸草地土壤种子库种子休眠的影响。[方法]采用不同浓度的H2SO4、GA3、KNO3浸泡不同退化草甸草地土壤种子库种子,并测定其发芽数。[结果]60%、70%、80%和90%H2SO4浸泡土壤库种子时,种子发芽个数均为0,种子发芽均受到抑制;用GA3浸泡土壤库种子时,种子发芽数随着GA3浓度的增加而增加,当浓度增大至0.1%时,种子发芽个数受到抑制;用0.2%KNO3浸泡土壤库种子时,种子发芽个数较空白对照均有所提高。[结论]在中度退化草地和重度退化草地土壤种子库中,种子留存数较多;而轻度退化草地和极度退化草地中种子较少。

Effect of Different Soak Treatments on Breaking Seed Dormancy in Soil Seed Bank from Different Degraded Grasslands

[Objective] The aim was to study the effect of different soak treatments on breaking seed dormancy in soil seed bank from different degraded grasslands. [Method] Different concentrations of H2SO4,GA3 and KNO3 were used for soaking the seeds in the soil seed bank from different degraded grasslands,and the germination number of seeds was detected. [Result] When the seeds from soil seed bank were soaked with 60%,70%,80% and 90% H2SO4,the germination number of seeds was 0,indicating that the germination of seeds was inhibited; when the seeds were soaked with GA3,the germination number of seeds increased with the concentration of GA3 increasing. When the concentration of GA3 increased to 0.10%,the germination of seeds was inhibited; when the seeds were soaked with 0.2% KNO3,the germination number of seeds was greater than the blank control. [Conclusion] The number of remaining seeds was more in the soil seed banks collected from moderately degraded grassland and heavily degraded grassland; while the number of remaining seeds was small in the soil seed banks collected from lightly degraded grassland and extremely degraded grassland.