中文摘要：

为了解补播对高寒草甸退化草地恢复过程中群落生产力、功能群结构和物种多样性方面的影响，于2010年5月以位于青藏高原东段的玛曲高寒草甸为研究对象，进行了补播试验。结果表明，补播显著提高地上生物量，同时物种数和丰富度指数Margalef也有显著增加，其中补播处理地上生物量是不补播处理的1．31-1．44倍。补播后莎草类和禾草类地上生物量都呈增长趋势，补播后禾草类地上生物量显著提高，其中最高是不补播的2，7倍，杂类草在群落中所占比例显著降低。适量补播既可以使草地的经济价值得以提高，同时也有利于高寒退化草地的恢复和生态系统的稳定。

英文摘要：

The effects of reseeding on community productivity, the structure of functional groups and on plant diversity have been carried out since May 2010 in a reseeding experiment on Maqu degra the east of the Tibetan Plateau. After reseeding, the productivity, species richness and Margalef significantly increased. Comparing the treatment without reseeding to that wit ductivity i quantity o reseeding. ncreased f reseedi ded the h re alpine meadow in richness index of seeding, the pro 31%--44~. The productivity of gramineae and sedge increased along with an increased ng, especially wit The proportion of forbs clusion, proper reseeding could rais cover degraded grassland and maint h sedges in which productivity was 2.7 times th in the community was greatly reduced in respon e the utility value of alpine meadows but in the ain the stability of the ecosystem. at in the treatment without se to the reseeding. In con- meantime it is better to re-