草地植被恢复措施对高寒草甸有毒植物的影响

通过对高寒草甸天然草地实施划破、补播、施肥及综合处理，探讨了不同草地植被恢复措施对高寒草甸有毒植物物种组成、多样性及生物量的影响。结果表明，不同处理草地中，有毒植物的组成及比例差异显著(P<0.05)。与对照相比，补播、划破和施肥均不同程度地降低了群落中有毒植物的物种数和Shannon Wiener指数(P<0.05)，不同处理草地有毒植物物种数和Shannon Wiener指数排序分别为补播<施肥=综合处理<划破<对照，补播<划破<施肥<对照<综合处理。补播、施肥和综合处理均可有效降低群落中有毒植物的地上生物量(P<0.05)，而草地划破在一定程度上增加了有毒植物的地上生物量(P>0.05)，不同处理草地有毒植物地上生物量排序为补播<综合处理<施肥<对照<划破。补播形成的垂穗披碱草(Elymus nutans)单一优势群落使有毒植物物种数、物种多样性及地上生物量均下降到最低值，对于毒杂草型退化草地的改良，草地补播是可供参考的有效恢复措施之一。

Effects of grassland vegetation restorations on poisonous plants in alpine meadow

In order to verify effects of different grassland vegetation restorations on species composition, diversity and biomass of poisonous plants in alpine meadow, the sample plots of natural grassland were imposed with sward ripping, reseeding, fertilization and integrated treatments. The results showed that there were significant differences in species compositions and proportions of poisonous plants in different sample plots (P<0.05). Compared with the control, the species number and Shannon Wiener index of poisonous plants in the communities were reduced significantly by treatments of reseeding, sward ripping and fertilization (P<0.05). The order of species number and Shannon Wiener index of poisonous plants in different sample plots was reseeding0.05). The order of aboveground biomass of poisonous plants was reseeding