【摘要】 为更好地了解青藏高原高寒草甸区暖季放牧条件下人工草地牧草的生长特点,为制定合理放牧制度提供依据,于2001~2003年开展了暖季放牧牦牛对多年生人工草地影响的试验。结果表明:放牧2年后轮牧人工草地播种牧草比例为95.27%,连续放牧人工草地为86.15%,无放牧人工草地为58.01%。轮牧人工草地牧草月风干重最高值3 198.8 kg/hm2,连续放牧人工草地为3 023.2 kg/hm2。放牧可以提高人工草地牧草生长率,轮牧人工草地的牧草生长率高于连续放牧人工草地。放牧还影响着第2年播种牧草的生长,轮牧能促进种子出苗数,播种牧草的鲜重,风干重和种子产量分别达到了5 088.88 kg/hm2,3 053.33 kg/hm2和480 kg/hm2,均高于连续放牧人工草地和无放牧草地,轮牧人工草地杂草鲜草产量最低,为193.33 kg/hm2。适宜的放牧是保持人工草地可持续利用的手段之一。更多还原

【Abstract】 Effect of yak grazing in warm season on perennial artificial grassland in alpine meadow was studied from 2001 to 2003 on Qinghai-Tibetan Plateau.The result showed that:after grazing for 2 years,the percentage of sown grasses was 95.27% in rotationally grazed grassland,86.15% in continuously grazed grassland and 58.01% in un-grazed grassland.The highest monthly air-dried dry matter yield（air-DM） was 3198.8 kg/hm² in rotationally grazed grassland and 3023.2 kg/hm² in the continuously grazed grassland.Absolute growth rate（AGR） increased in grazed grassland;The AGR was higher in rotationally grazed grassland than those in continuously grazed grasslands.Grazing shown impact on growth of grasses in next year as well.Seed emergence was improved in rotationally grazed grassland.Fresh yield and air-DM yield of sown species in next year were 5088.88 kg/hm²and 3053.33 kg/hm² respectively in the rotationally grazed grassland and seed yield of in the rotational grazed was 480 kg/hm²,which were significantly higher than those in the continuously grazed grasslands and non-grazed grassland.Fresh yield of weeds in the rotational grazed artificial grassland was 193.33 kg/hm²,lower than those in the continuous grazed and non-grazed grasslands.更多还原