Study on improvement effects of alpine grassland at Gaize, Tibet

Eeffects of different improved measures on vegetation height, density, coverage, aboveground biomass, important value and species diversity of degenerated alpine grassland located at Gaize county, Tibet, China, was studied. The results showed that that compared with the non improved measures control plots, the vegetation height, density, coverage, biomass, important value and species diversity from the plots received different improved measures were all increased. Simpson index and ShannonWeiner index were increased significantly after applying enclosure＋irrigation＋reseeding and enclosure＋irrigation measures. Among all the improved measures the enclosure＋irrigation＋reseeding measures significantly increased Pielou evenness index. Overall, enclosure＋irrigation measures are the best improved measures in the degenerated alpine grassland of Gaize county, Tibet.