中文摘要：

青南与青北高寒草甸植被、土壤、气候类型相似,地植被、土壤碳密度可比性强.研究表明,青南高寒草甸植被退化严重,植被和土壤碳密度随退化程度的加剧而降低,轻度、中度、重度和极度退化植被碳密度分别为921.281、809.998、237.974gC.m-2和75.972gC.m-2,0～40cm土壤碳密度分别为16.760、16.145、14.360gC.m-2和12.945kgC.m-2.在青北未退化草甸植被和0～40cm层次土壤碳密度分别为1 149.327gC.m-2和20.305kgC.m-2.相对青北高寒草甸植被类型而言,青南高寒草甸轻度、中度、重度、极度退化的植被固碳密度分别增加228.046、339.329、911.354gC.m-2和1073.355gC.m-2,而对应0～40cm层次土壤固碳密度可分别增加3.545、4.160、5.946gC.m-2和7.359kgC.m-2.以青南当地未退化草地而言,轻度、中度、重度和极度退化的高寒草甸0～20cm层次土壤固碳密度可达1.694、2.087、3.537kgC.m-2和4.282kgC.m-2,表现出较大的固碳潜力.

英文摘要：

Alpine meadow in the south and north of Qinghai Province are similar in terms of vegeta- tion, soil and climate. Moreover, the vegetation, as well as soil carbon density, has a perfect compa- rability between the south and north of the prov- ince. It is found that in the south alpine meadow vegetation degenerates seriously, and carbon den- sities in vegetation and soil show a gradual de- crease with aggravating degradation. Carbon den- sities in vegetation of mild, moderate, severe and extreme severe degeneration are 921. 281 gC.m 2, 809. 998 gC-m-2, 237. 974 kgC.m 2, 75. 972 gC. m 2, respectively, and 0-40-cm soil carbon densi- ties of them are 16. 760 kgC.m-2, 16. 145 kgC. m-2, 14. 360 kgC.m-2, 12. 945 kgC.m-2, respec- tively. In the north of the province, the meadow vegetation and soil carbon densities without degra- dation are 1 149. 327 gC.m-2 and 20. 305 kgC.m^-2, respectively. In the south of the province, the carbon densities of alpine meadows vegetation of the mild, moderate, severe and extreme severe degeneration are 228. 046 gC. m2, 339. 329 gC, m^-2, 911. 354gC.m-2 and1073.355 gC-m 2, re- spectively, more than that in the north of the prov- ince, and the 0 - 40 cm soil carbon densities of them are 3. 545 kgC.m 2, 4. 160 kgC.m-2, 5. 946 kgC.m-2 and 7. 359 kgC.m-2, respectively, more than that in the north of the province, which show that the southern alpine meadows vegetation has more potential for carbon sequestration. In the un- degraded grassland in the south, 0 - 20-cm soil carbon densities of the alpine meadow of the mild, moderate, severe and extreme severe degeneration can reach 1. 694 kgC.m-2, 2. 087 kgC.m-z, 3. 537 kgC. m-2 and 4. 282 kgC. m-2, respectively, which show a high carbon sink potential.