锡林郭勒放牧草地封育后植被恢复过程的研究

Study on the restoration process of enclosed grassland in Xilinguole

通过对不同时期(1987、1997、2003年)围封禁牧的草地与自由放牧草地的对比试验,研究了封育后锡林郭勒典型草原的恢复过程,结果表明:围封禁牧对草原植被的盖度、地上生物量、净生产力都有显著的影响;随禁牧时间的增加,群落覆盖度及生物量都有明显的增加;随着封育时间的延长,草原生态系统的物种多样性和丰富度都表现出先上升后下降的趋势;长期封育不利于草地物种多样性的提高。

The restoration process of the grassland was studied through observing the grassland under enclosure and grazing conditions.The results showed that enclosure to prevent grazing have the obvious effects on vegetation coverage,biomass and net productivity.And the coverage and biomass increased as the time elongating.Moreover,the species diversity of the grassland increased at the early period of enclosure,but the species diversity and the richness decreased as the enclosure time elongating.Long time enclosure could not help to improve the species diversity of the grassland.