不同围栏强度对巴里坤草原物种多样性和生物量的影响

Effects of Different Fence Intensity on the Barkol Grassland Species Diversity and Biomass

通过对新疆巴里坤天然草地进行围栏(2a、4a、25a)和自由放牧处理,探讨不同干扰类型对草地植物多样性和生物量的影响。结果表明:在自由放牧制度下,由于干扰过于剧烈,草地已呈退化趋势,物种多样性和生物量均较低;在围栏草地中,随着围封年限的增加,群落高度、盖度、地上生物量逐渐增加;地上生物量的变化趋势为:放牧草地<围栏2a草地<围栏4a草地<围栏25a草地。

The main purpose of this study is to research the different effects including enclosure （ for 2 years, 4 years and 25 years） and free grazing on the biodiversity and biomass of the Barkol Grassland. The results show that under free - grazing system, due to severe interference, the grass has shown a trend of degeneration, and both the species diversity and biomass are low. In the enclosure steppes, with prolonging the enclosure time, community height, cov- erage, aboveground biomass increase gradually. The trend of the aboveground biomass is grazing steppe 〈 2 - year en-closure steppe 〈 4 -year enclosure steppe 〈 25 -year enclosure steppe.