The study on vegetation characteristics of different grassland restoration measureson karst rocky desertification in Qiaojia county of Yunnan province

Compared with natural grassland, this paper analyzed species composition, community structure characteristics, biodiversity and the total annual fresh yield of grassland vegetation in different grassland controlling measures (including artificial grassland, improved and enclosure grassland) of karst rocky desertification in Jianshan of Qiaojia county of Yunnan. The results indicated that enclosure grassland had the most species, followed by improved grassland, and the artificial grassland had the least. There were little common species among four grasslands, and different grassland had different dominant species, subdominant, companion species, occasional species.The dominant species on artificial grassland was Lolium perenne, improved grassland was Trifolium repens, the enclosure was Potentilla fulgens. The orders of diversity indexes including Simpson index, ShannonWiener index and richness index ranked as enclosure grassland ＞natural grassland＞improved grassland＞artificial grassland the Pielou index was enclosure＞improved grassland＞natural grassland＞artificial grassland; the orders of yield and good forage percentage were artificial grassland＞improved grassland＞enclosure＞natural grassland. There were contrary change tendency among the quantity, quality and diversity indexes of different grasslands. Artificial grassland was the best effective measure in controlling degraded grassland of rocky desertification, improved grassland was better, and enclosure was the worst.