Effects of reseeding alpine No#1ecograss on degraded alpine meadows in Maqu after enclosure

In order to study the improvement effects of enclosure and reseeding on degraded alpine meadows (subalpine meadows and swamp meadows), the tests of enclosure and reseeding alpine No#1 ecological mixture grass in degraded alpine meadows of the eastern QinghaiTibetan Plateau was conducted. The mean vegetation height and coverage, aboveground productivity of enclosure and reseeding were monitored after three years. Results showed that enclosure significantly increased the average vegetation height (49.57% and 53.38%), coverage (24.73% and 25.25%) and aboveground productivity (16.40% and 22.17%) in degraded subalpine meadows and swamp meadows, but there was no significant difference for species richness compared with the control. Reseeding alpine No#1 ecological mixture grass in fenced meadows had better effects, which could also significantly increased the mean vegetation height (17.64% and 15.78%), coverage (48.38% and 50.50%) and aboveground productivity (3.24% and 9.39%) in these twotype degraded meadows, respectively; an increase in species richness was observed. In conclusion, enclosure and reseeding were all effective improving measures for degraded alpine meadows, and their cooperation would be better than enclosure only. Additionally, the alpine No#1 ecological mixture grass showed favorable adaptability and effect on reseeding and improving degraded alpine meadows.