杜尔伯特蒙古族自治县沙化草地封沙禁牧效果研究

Effect of Closing Sandy Land and Forbidding Herding on Sandy Grassland in Durbat Monggol Nationality Autonomous County

通过对嫩江沙地具有代表意义的退化草地封育后植物群落的调查,研究了封育禁牧后沙地植被生长发育规律和演替趋势。结果表明：与自由放牧相比,封沙禁牧分别使半固定和固定沙质草地植被盖度提高25和27个百分点,产草量（干草）分别提高27.09%~41.09%,优质牧草比例分别提高23.51和46.27个百分点。

Through the investigation of phytocoenosium of degeneration grassland after closing off on Nenjiang sandy Land, growth law and succession tendency of sandy land vegetation were studied after closing sandy land and forbidding herding. Closing sandy land and forbidding herding increases by 25% and 27% respectively on the vegetation coverage of semifixed and fixed sandy grassland compared with that under continuous grazing. Forage yield （hay） increases by 27.09 - 41.09% respectively. Ratio of high quality grass increases by 23.51% and 46.27% respectively.