温度对轮叶马先蒿种子发芽的影响

Impact of Temperature on Seed Germination of Pedicularis verticilata (Scrophulariaceae)

为遏止轮叶马先蒿(Pedicularis verticilataL.)对新疆巴音布鲁克草原畜牧业的发展的威胁。开展了恒温和变温条件下轮叶马先蒿种子发芽试验,共设计了6个处理。结果表明:1)变温条件下的种子发芽率优于恒温,各处理每日种子发芽数目的变化均表现为先升高后下降。2)较高和较低温度下,发芽率和发芽指数均较低。3)在5月下半月变温(14.76,20.9,6.31和4.01℃)条件下,种子发芽率和发芽指数最高,分别为76.9%和18.1。因此,5月下半月是遏止本地入侵种轮叶马先蒿扩散的关键时期。

Within recent years, Pedicularis verticilata L. have invaded in Bayanbulak grassland of XinJiang, and such invasion which is threatening grassland quality of livestock grazing in this region. Seed germinations of this species were examined based on six temperature treatments： constant temperature （treatment 1, 28℃ ; treatment 2, from 17 to 20℃ ; treatment 3, from 9 to 16℃）; ahemative temperature （treatment 4, 9.66, 10.21, 0.15 and -0.83℃; treatment 5, 14.76, 20.9, 6.31 and 4.01℃; treatment 6, 26.17, 29.58, 5.19 and 0.75℃）. The experiments results showed： 1） Germination rate were higher in alternative temperature than in constant temperature and the germination trend showed an uni-modal patterns;2） Germination rate and germination index were lower in higher or lower temperature;3） Germination rate and germination index under the alternatively changed temperatures （ average temperature of the latter half on May in this region recorded as 14.76, 20.9, 6.31 and 4.01℃ ） was the highest, respectively 76.9% and 18.1. Therefore, it is suggested that, the late May might be the also the important time period to prevent this species from invading native grassland.