Abstract: 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, from17 to 20℃; treatment 3, from 9 to 16℃ ); alternative 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.

Key words: Grassland