播期对青海草地早熟禾生长特性的影响

Effects of Sowing Dates on Growth of Poa pratensis L.cv. 'Qinghai'

为了研究青海草地早熟禾(Poa pratensis L.cv.‘Qinghai’)在祁连山区的最适播期,设置17个播种时期,通过2a对不同播期青海草地早熟禾生长特性进行观测。研究结果表明,在栽培的第2年,5月中旬到8月上旬期间播种的青海草地早熟禾均可以完成整个生活史;随着播期的推后青海草地早熟禾的生长呈现先增加后降低的趋势,其中6月下旬播期的青海草地早熟禾的盖度、株高、密度、地上植物量、种子产量、千粒质量及生殖枝数最高。日均气温和日照时数对青海草地早熟禾的生长影响较为显著。研究结果说明,青海草地早熟禾在祁连山默勒地区最佳播期应以6月下旬为宜。

To investigate the optimal seeding time of Poa pratensis L.cv.‘Qinghai’in Qilian mountain area,Poa pratensis L.cv.‘Qinghai’sowing at seventeen dates were observed growth characteristics continuously for two year.The results showed that Poa pratensis L.cv.‘Qinghai’sowing during mid-May to early August could finish its life cycle.With the delay of seeding time,the growth of Poa pratensis L.cv.‘Qinghai’presented an up and down trend.Poa pratensis L.cv.‘Qinghai’seeded at mid-June had the optimal plant height,density and quantity of land plants,seed yield,grain and reproductive branch number.The average daily temperature and sunshine duration had a significant effect on the growth of Poa pratensis L.cv.‘Qinghai’.In conclusion,late June was the optimal seeding period for Poa pratensis L.cv.‘Qinghai’.